Module 11 - System-Based Clinical Review

Educational use: This independent BoardQBank resource is not affiliated with NABNE or NPLEX. All items are marked pretest and require formal subject-matter-expert and psychometric review before scored or high-stakes use.

Diagnosis GEASystem-Based Clinical Review SEA

Exact balanceA 50 · B 50 · C 50 · D 50

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NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current multidisciplinary guideline relevant to the multisystem disorder, including organ-specific monitoring and referral recommendations.
Current specialty-society guideline and current authorized product monograph relevant to “Scleroderma Renal Crisis.”

100

Granulomatosis With Polyangiitis and Pulmonary–Renal Syndrome

1 questions ·

GEA: Medical InterventionsSEA: Multisystem

System-based clinical case

A 54-year-old man presents with chronic sinus pain, recurrent nosebleeds, hearing difficulty, cough, hemoptysis and rapidly worsening fatigue. Examination and Investigations Blood pressure: 152/88 mmHg Nasal crusting and ulceration Bilateral lung crackles Purpuric lesions over the legs Creatinine: Rapidly increasing Urinalysis: ○ Blood 3+ ○ Protein 2+ ○ Red-cell casts Hemoglobin: Falling CRP: Markedly elevated Chest CT: Multiple pulmonary nodules and bilateral ground-glass opacities PR3-ANCA: Positive

Question 1 of 1NPLEX-SYS-100

What is the most appropriate management?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Granulomatosis with polyangiitis causing rapidly progressive glomerulonephritis and pulmonary involvement Differential Diagnosis Microscopic polyangiitis Anti-GBM disease Systemic lupus erythematosus Infective endocarditis Severe bacterial or fungal infection Tuberculosis IgA vasculitis Cryoglobulinemic vasculitis Cocaine or levamisole-associated vasculitis Malignancy Key Investigations CBC Creatinine and electrolytes Urinalysis and urine microscopy Urine protein quantification PR3-ANCA and MPO-ANCA Anti-GBM antibodies ANA and complement Blood cultures Chest CT Bronchoscopy when pulmonary hemorrhage or infection requires clarification Kidney biopsy Infection screening before immunosuppression Gold-Standard Investigation Tissue biopsy, commonly kidney biopsy, provides histological confirmation and typically demonstrates pauci-immune necrotizing crescentic glomerulonephritis. ANCA supports the diagnosis but should be interpreted with the clinical and pathological picture. Conventional Treatment Induction of Remission High-dose glucocorticoid treatment Rituximab or cyclophosphamide Consideration of reduced-glucocorticoid strategies where appropriate Plasma exchange in selected circumstances after specialist assessment Respiratory support and transfusion for severe alveolar hemorrhage Dialysis when indicated Maintenance Rituximab or another maintenance immunosuppressive strategy Infection prophylaxis Vaccination planning Monitoring for relapse and treatment toxicity ENT, pulmonary and renal follow-up Naturopathic Treatment Plan Adjunctive care includes: Smoking cessation Adequate protein and calories individualized to renal function Sodium moderation Bone protection during glucocorticoid treatment Infection-prevention measures Gradual rehabilitation Hearing and sinus support under specialist care Medication-adherence counselling Botanical and Supplement Safety Avoid Echinacea purpurea and other immune-stimulating products. Avoid NSAID-like botanicals during kidney injury. Avoid nephrotoxic supplements. Avoid Hypericum perforatum because of major immunosuppressant interactions. Avoid live probiotics during profound immunosuppression without review. Review garlic, ginkgo and curcumin before biopsy or during pulmonary bleeding. Monitoring Creatinine and urine output Hematuria and proteinuria Hemoglobin Oxygenation Hemoptysis CRP Treatment-associated cytopenia Infection Liver function ANCA trends interpreted alongside clinical findings Relapse symptoms Urgent Referral Criteria Hemoptysis Falling hemoglobin Hypoxemia Red-cell casts with rising creatinine Oliguria Severe hypertension Mononeuritis multiplex ● Orbital involvement ● Rapid hearing loss ● Serious infection during immunosuppression Clinical Pearl Red-cell casts plus hemoptysis should trigger immediate evaluation for pulmonary–renal vasculitis or anti-GBM disease. NPLEX Examination Trap Do not diagnose recurrent sinusitis alone when upper-airway disease is accompanied by kidney injury, purpura or pulmonary hemorrhage. Disease Overview Granulomatosis with polyangiitis is a necrotizing small- and medium-vessel vasculitis frequently affecting the upper respiratory tract, lungs and kidneys. Delayed treatment may cause irreversible renal failure, respiratory failure or death. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current multidisciplinary guideline relevant to the multisystem disorder, including organ-specific monitoring and referral recommendations.
Current specialty-society guideline and current authorized product monograph relevant to “Granulomatosis With Polyangiitis and Pulmonary–Renal Syndrome.”

101

Acute Septic Arthritis

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 62-year-old man with type 2 diabetes presents with sudden severe pain and swelling of the right knee. He cannot bear weight and reports chills. Examination and Investigations Temperature: 38.8°C Heart rate: 112/min Right knee: Markedly swollen, warm and erythematous Severe pain with active and passive movement WBC: 16.8 × 10⁹/L CRP: Markedly elevated Serum urate: 460 µmol/L No recent trauma

Question 1 of 1NPLEX-SYS-101

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute bacterial septic arthritis of the right knee Differential Diagnosis Gout Calcium-pyrophosphate deposition disease Reactive arthritis Traumatic hemarthrosis Lyme arthritis Rheumatoid-arthritis flare Osteoarthritis flare Charcot arthropathy Key Investigations Arthrocentesis Synovial Gram stain and culture Synovial crystal analysis Blood cultures CBC CRP and ESR Renal and liver function Plain radiograph for baseline structural assessment Ultrasound to identify an effusion or guide aspiration MRI when osteomyelitis or deep infection is suspected A high synovial leukocyte count increases suspicion, but no single cutoff reliably excludes infection. Crystals may coexist with septic arthritis. Conventional Treatment Prompt empiric IV antibiotics after cultures are collected Coverage based on age, exposure, Gram stain and local resistance Urgent joint drainage Repeated aspiration, arthroscopic lavage or open drainage as indicated Culture-directed antimicrobial treatment Evaluation for bacteremia, endocarditis and osteomyelitis ● Rehabilitation after infection is controlled Relevant Safety Issues Do not inject corticosteroids before excluding infection. Do not rely on fever absence to rule out septic arthritis. Do not exclude infection because crystals are present. Do not delay antibiotics in shock while waiting for aspiration. Avoid NSAIDs as the only treatment in a systemically ill patient. Botanical and Supplement Safety No botanical therapy substitutes for drainage and antibiotics. Avoid immunosuppressive botanicals or high-dose corticosteroid-like products. Review garlic, ginkgo and curcumin before surgery. Do not apply irritant essential oils over an inflamed joint. Avoid herbal products that mask fever or delay reassessment. Single Best Next Step Urgent arthrocentesis, followed promptly by empiric antibiotics and orthopedic management. Clinical Pearl A crystal-positive joint may still be infected. NPLEX Examination Trap Do not diagnose gout from an elevated serum urate when the patient has fever and a hot monoarticular joint. Disease Overview Septic arthritis is microbial infection of a synovial joint. The knee is commonly involved, and major risk factors include older age, diabetes, immunosuppression, skin infection, recent joint procedures and prosthetic joints. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Septic Arthritis.”

102

Acute Gout Flare in a Patient Taking Allopurinol

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 55-year-old man with previously crystal-confirmed gout develops abrupt severe pain, swelling and redness of the first right metatarsophalangeal joint after a weekend of heavy alcohol intake. He started allopurinol three months ago and asks whether he should stop it during the flare. Examination and Investigations Temperature: 36.9°C Blood pressure: 138/82 mmHg First MTP joint: Exquisitely tender, warm and swollen No spreading cellulitis No systemic symptoms eGFR: 72 mL/min/1.73 m² Serum urate: 390 µmol/L

Question 1 of 1NPLEX-SYS-102

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute podagra caused by monosodium urate crystal inflammation Differential Diagnosis Septic arthritis Cellulitis Calcium-pyrophosphate arthritis Traumatic arthritis Osteoarthritis flare Stress fracture Reactive arthritis Key Investigations Routine imaging is not always required in established typical gout. Consider: Joint aspiration if infection is possible or the diagnosis is uncertain Renal function CBC when systemic infection is possible Medication review Serum urate after the flare for long-term management Ultrasound or dual-energy CT in selected uncertain cases Conventional Treatment Acute Flare Low-dose colchicine NSAID when safe Oral, intra-articular or intramuscular glucocorticoid when appropriate Ice Temporary joint rest Continue established allopurinol Long-Term Management Titrate urate-lowering therapy to target Provide anti-inflammatory prophylaxis during dose escalation Address obesity, alcohol intake and medication contributors Review diuretic therapy when clinically feasible Manage kidney and cardiovascular disease Relevant Safety Issues ● Avoid NSAIDs in active ulcer bleeding, severe kidney disease or major anticoagulant-associated bleeding risk. ● Reduce or avoid colchicine in major renal dysfunction and with interacting CYP3A4 or P-glycoprotein inhibitors. ● Glucocorticoids can worsen glucose control. ● Allopurinol-associated rash, fever or mucosal lesions require urgent assessment for severe cutaneous adverse reaction. ● Test selected high-risk populations for HLA-B*58: 01 before allopurinol according to guideline-based risk assessment. Botanical and Supplement Safety Cherry products may be used as food but should not replace urate-lowering therapy. Avoid high-dose niacin because it may raise urate. Avoid dehydration-promoting “detox” regimens. Review turmeric, ginger and willow bark when NSAIDs or anticoagulants are used. Vitamin C is not a substitute for allopurinol. Single Best Next Step Continue allopurinol and treat the acute inflammation with an appropriate first-line anti-inflammatory agent. Clinical Pearl Urate-lowering therapy controls the cause; anti-inflammatory treatment controls the current flare. NPLEX Examination Trap Do not stop allopurinol simply because an acute attack has occurred. Disease Overview Gout is inflammatory arthritis caused by deposition of monosodium urate crystals. Long-term treatment requires sustained lowering of serum urate below its crystallization threshold. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Gout Flare in a Patient Taking Allopurinol.”

103

Early Rheumatoid Arthritis

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 43-year-old woman reports four months of hand pain and swelling. Morning stiffness lasts almost two hours and improves with activity. Examination and Investigations ● Symmetrical swelling of the MCP and PIP joints Positive MCP squeeze test Mild wrist synovitis DIP joints are spared CRP: Elevated Rheumatoid factor: Positive Anti-CCP antibody: Strongly positive Hand radiographs: Periarticular osteopenia without major erosions

Question 1 of 1NPLEX-SYS-103

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Early seropositive rheumatoid arthritis Differential Diagnosis Psoriatic arthritis Systemic lupus erythematosus Viral polyarthritis Osteoarthritis Calcium-pyrophosphate arthritis Palindromic rheumatism Hemochromatosis arthropathy Paraneoplastic arthritis Key Investigations CBC Creatinine and liver enzymes ESR and CRP Rheumatoid factor Anti-CCP Baseline hand and foot radiographs Hepatitis B and C assessment Tuberculosis screening before biologic or targeted therapy Pregnancy testing and reproductive planning Vaccination review Conventional Treatment Early DMARD treatment Methotrexate with folic-acid supplementation when appropriate Treat-to-target assessment Short-term glucocorticoid bridge only when necessary Escalation to combination conventional, biologic or targeted therapy if target is not reached Occupational therapy Exercise and hand-function rehabilitation Cardiovascular-risk management Smoking cessation Relevant Safety Issues Before methotrexate: Confirm pregnancy status and contraception plan. Assess liver, kidney and blood-cell status. Review alcohol use. Screen for relevant infection. Provide folic acid. Explain that methotrexate is generally dosed weekly, not daily. Serious medication toxicity can occur if weekly methotrexate is mistakenly taken every day. Botanical and Supplement Safety Avoid Echinacea purpurea and unregulated immune stimulants. Avoid Hypericum perforatum because of drug interactions. Review concentrated green-tea extract and other potentially hepatotoxic products. Avoid combining multiple NSAID-like botanicals with prescription NSAIDs. Do not replace DMARD therapy with curcumin or dietary treatment. Monitoring Joint count and function Disease-activity score CBC Liver enzymes Creatinine Infection Pulmonary symptoms Pregnancy status Medication adherence ● Radiographic progression when appropriate Single Best Next Step Early rheumatology referral and initiation of DMARD therapy after baseline safety evaluation. Clinical Pearl Anti-CCP positivity is highly supportive of RA and is associated with increased risk of erosive disease. NPLEX Examination Trap Do not wait for radiographic erosions before starting disease-modifying treatment. Disease Overview Rheumatoid arthritis is a systemic autoimmune inflammatory disease that primarily targets synovial joints. Uncontrolled inflammation can cause cartilage destruction, bone erosion and extra-articular disease. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Early Rheumatoid Arthritis.”

104

Axial Spondyloarthritis

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 28-year-old man reports three years of gradually progressive low-back and buttock pain. Symptoms are worse during the second half of the night, improve after exercise and do not improve with rest. He had anterior uveitis eight months ago. Examination and Investigations Reduced lumbar flexion Positive sacroiliac-provocation testing Reduced chest expansion CRP: Elevated ● HLA-B27: Positive ● Pelvic radiograph: No definite sacroiliitis ● MRI: Active inflammatory sacroiliitis

Question 1 of 1NPLEX-SYS-104

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Axial Spondyloarthritis.”

105

Psoriatic Arthritis With Dactylitis

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 39-year-old man with a 12-year history of plaque psoriasis presents with six months of worsening joint pain and morning stiffness. His right second toe has become diffusely swollen and painful. Examination and Investigations Scalp and extensor-surface psoriatic plaques Nail pitting and onycholysis Diffuse swelling of the entire right second toe Tenderness at the Achilles tendon insertion Swollen right knee Distal interphalangeal-joint tenderness Rheumatoid factor: Negative Anti-CCP antibody: Negative CRP: Elevated Radiograph: Early erosive change with new bone formation

Question 1 of 1NPLEX-SYS-105

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Active psoriatic arthritis with peripheral synovitis, dactylitis and enthesitis Differential Diagnosis Rheumatoid arthritis Gout Reactive arthritis Osteoarthritis Septic arthritis Inflammatory bowel disease-associated arthritis Ankylosing spondylitis Sarcoid dactylitis Key Investigations Detailed skin and nail examination Joint and enthesis assessment CBC CRP and ESR Renal and liver function Rheumatoid factor and anti-CCP Plain radiographs Musculoskeletal ultrasound or MRI when needed Hepatitis and tuberculosis screening before selected immunosuppressive treatments Assessment for inflammatory bowel disease and uveitis Cardiovascular and metabolic risk assessment Conventional Treatment Management may include: ● NSAID treatment for limited symptoms when safe ● Conventional DMARD for active peripheral arthritis ● TNF-inhibitor, IL-17-inhibitor, IL-23-pathway or other targeted treatment according to disease domains and patient factors ● Local corticosteroid injection after infection is excluded ● Physical and occupational therapy ● Treatment of skin and nail disease ● Weight, smoking and cardiovascular-risk management ACR guidance emphasizes individualized therapy based on the pattern and activity of arthritis, enthesitis, dactylitis, axial disease, psoriasis and comorbid conditions. Naturopathic Treatment Plan Maintain regular low-impact aerobic and resistance activity. Use a Mediterranean-style dietary pattern. Pursue gradual weight reduction when appropriate. Stop smoking. Limit excessive alcohol, particularly with hepatotoxic medication. Address sleep, fatigue and psychological burden. ● Protect inflamed entheses from repetitive overload without prolonged immobilization. Botanical and Supplement Safety ● Do not replace DMARD or biologic therapy with curcumin or fish oil. ● Avoid immune-stimulating botanicals during active autoimmune disease without specialist review. ● Review Hypericum perforatum because of major drug interactions. ● Avoid concentrated hepatotoxic products when methotrexate or leflunomide is used. ● Review bleeding-promoting supplements when NSAIDs are prescribed. ● Do not apply topical products over cracked or infected psoriatic skin without assessment. Monitoring Swollen and tender joints Dactylitis Enthesitis Skin and nail activity Functional ability CRP Medication toxicity Infection Cardiovascular risk Eye and gastrointestinal symptoms Single Best Next Step Refer for rheumatology-directed disease-modifying treatment rather than treating the skin or pain alone. Clinical Pearl Dactylitis, or a “sausage digit,” is a major clue to psoriatic arthritis and related spondyloarthritis. NPLEX Examination Trap Do not exclude inflammatory arthritis because rheumatoid factor is negative. Disease Overview Psoriatic arthritis is a chronic immune-mediated disease involving peripheral joints, entheses, digits, spine, skin and nails. Delayed control can result in structural damage and disability. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Psoriatic Arthritis With Dactylitis.”

106

Dermatomyositis With Dysphagia

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 52-year-old woman presents with progressive difficulty rising from chairs, climbing stairs and lifting objects above her head. She has also developed difficulty swallowing solid food. Examination and Investigations Symmetrical proximal shoulder and hip weakness Violaceous discoloration around the eyelids Scaly erythematous papules over the MCP and PIP joints Photosensitive erythema over the upper chest and shoulders Neck-flexor weakness Creatine kinase: Markedly elevated AST and ALT: Elevated ESR: Elevated Urinalysis: No hematuria

Question 1 of 1NPLEX-SYS-106

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Adult dermatomyositis with clinically important bulbar involvement Differential Diagnosis Polymyositis Immune-mediated necrotizing myopathy Inclusion-body myositis Statin-associated myopathy Hypothyroid myopathy Myasthenia gravis Muscular dystrophy Systemic lupus erythematosus Paraneoplastic myopathy Key Investigations Creatine kinase and aldolase AST, ALT and LDH CBC ESR and CRP Myositis-specific and associated antibodies Electromyography MRI of affected muscles Muscle or skin biopsy when needed Pulmonary-function testing High-resolution CT when interstitial lung disease is suspected Swallowing evaluation ECG and cardiac evaluation when indicated Age- and risk-appropriate malignancy screening Gold-Standard Diagnostic Approach Diagnosis integrates: Characteristic clinical weakness Dermatologic findings Muscle enzymes Autoantibodies Electrophysiology MRI Histopathology when required A muscle or skin biopsy may provide confirmation and help distinguish different inflammatory myopathies. Conventional Treatment Systemic glucocorticoid treatment Early steroid-sparing immunosuppressive therapy IV immunoglobulin or other targeted therapy in selected severe or refractory disease Swallowing and nutritional support Aspiration precautions Physical rehabilitation after inflammation begins to improve Treatment of interstitial lung disease Malignancy evaluation and treatment when identified Oral or IV corticosteroids are commonly used initially, often with an additional immunosuppressive agent to improve disease control and reduce long-term corticosteroid exposure. Naturopathic Treatment Plan Use strict sun protection. Ensure adequate protein and calories. Correct vitamin D deficiency when documented. Begin supervised graded rehabilitation rather than exhaustive exercise. Use aspiration-safe food textures when recommended. Stop smoking. Maintain vaccinations according to immunosuppression plans. Botanical and Supplement Safety Avoid echinacea and other unreviewed immune-stimulating botanicals. Avoid red-yeast rice and statin-like supplements during active myopathy. Avoid creatine supplements during significant muscle injury or kidney dysfunction. Review hepatotoxic supplements with methotrexate or other immunosuppressive drugs. Avoid sedating herbs when swallowing or respiratory muscles are weak. Do not use antioxidants or anti-inflammatory supplements instead of systemic treatment. Monitoring Proximal strength Swallowing Respiratory symptoms Creatine kinase Pulmonary function Weight and nutrition Cardiac symptoms Medication toxicity Malignancy warning signs Urgent Referral Criteria Dysphagia Aspiration Shortness of breath Weak cough Rapid progression of weakness Chest pain or arrhythmia Severe weight loss Suspected interstitial lung disease Dark urine or acute kidney injury Single Best Next Step Urgent specialist assessment with immediate evaluation of swallowing and respiratory safety. Clinical Pearl AST and ALT may rise from inflamed skeletal muscle and do not automatically indicate primary liver disease. NPLEX Examination Trap Do not focus on the skin eruption while overlooking dysphagia or respiratory-muscle weakness. Disease Overview Dermatomyositis is an immune-mediated inflammatory myopathy characterized by proximal weakness and distinctive skin findings. It may involve the lungs, swallowing muscles, heart and other organs. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Dermatomyositis With Dysphagia.”

107

Acute Compartment Syndrome

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 31-year-old man undergoes casting after a closed tibial fracture. Six hours later, he reports rapidly worsening lower-leg pain despite opioid medication. Examination Severe pain out of proportion to the visible injury Pain worsened by passive extension of the toes Tense, firm anterior lower-leg compartment Paresthesia over the first web space Dorsalis pedis pulse remains palpable Capillary refill: Normal Increasing analgesic requirement

Question 1 of 1NPLEX-SYS-107

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute anterior-compartment syndrome following tibial fracture and casting Differential Diagnosis Expected postfracture pain Arterial occlusion Deep-vein thrombosis Peripheral nerve injury Cellulitis Necrotizing soft-tissue infection Complex regional pain syndrome Cast-related focal compression without compartment syndrome Key Investigations Diagnosis is primarily clinical. When the examination is unreliable or findings are equivocal: ● Serial neurovascular examinations ● Intracompartmental pressure measurement ● Delta-pressure assessment ● Creatine kinase and renal function when muscle injury is advanced ● Urinalysis for myoglobin ● Fracture imaging Testing must not delay surgery when clinical findings are convincing. Conventional Treatment Immediately split or remove cast and constrictive dressings Emergency orthopedic consultation Prompt fasciotomy of all affected compartments Fracture stabilization Fluid and electrolyte monitoring Management of rhabdomyolysis Repeat debridement when necrotic tissue is present Wound reconstruction when necessary Relevant Safety Issues Distal pulses may remain normal. Analgesia must not substitute for repeated examination. Regional anesthesia and sedation can make assessment more difficult. A normal single pressure measurement does not exclude evolving disease. Delay may lead to amputation, kidney injury or death. Botanical and Supplement Safety Do not perform massage, manipulation or compression therapy. Avoid oral supplements when emergency anesthesia is likely. Review products that increase bleeding before surgery. Do not use topical counterirritants to mask escalating pain. Avoid creatine or potassium supplements if rhabdomyolysis is developing. Monitoring Pain Passive-stretch pain Sensation Motor function Compartment firmness Renal function Potassium ● Creatine kinase ● Urine output ● Postoperative wound status Single Best Next Step Release external compression and obtain immediate surgical decompression assessment. Clinical Pearl Pain with passive stretch is an early and important sign; absent pulses are late. NPLEX Examination Trap Do not rule out compartment syndrome because the foot is warm and the pulse is palpable. Disease Overview Acute compartment syndrome occurs when pressure within a closed fascial space impairs capillary perfusion. Progressive ischemia causes muscle necrosis, nerve injury and systemic complications. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Compartment Syndrome.”

108

Suspected Cutaneous Melanoma

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 47-year-old woman presents with a pigmented lesion on her upper back that has changed over eight months. Examination The lesion is: ● Asymmetric ● 11 mm in diameter Irregularly bordered Variegated brown, black and reddish in colour Larger than in a photograph from last year Intermittently itchy Slightly raised in one area There is no palpable lymphadenopathy.

Question 1 of 1NPLEX-SYS-108

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Cutaneous melanoma until proven otherwise Differential Diagnosis Dysplastic nevus Seborrheic keratosis Pigmented basal-cell carcinoma Solar lentigo Dermatofibroma Blue nevus Pigmented actinic keratosis Benign melanocytic nevus Key Investigations Complete skin examination Dermoscopic assessment Excisional biopsy Histopathological assessment of: ○ Breslow thickness ○ Ulceration ○ Mitotic activity ○ Peripheral and deep margins ● Lymph-node examination ● Sentinel lymph-node assessment for selected confirmed melanomas ● Imaging only when indicated by stage or symptoms Gold-Standard Diagnostic Investigation Histopathological examination of an appropriately obtained skin biopsy Conventional Treatment Treatment after diagnosis may include: Wide local excision based on tumour thickness Sentinel lymph-node biopsy in appropriately selected patients Nodal management Immunotherapy Targeted therapy for selected molecular profiles Radiation therapy in selected circumstances Long-term skin and lymph-node surveillance Surgery remains the foundation of treatment for localized cutaneous melanoma. Naturopathic Treatment Plan Following definitive care: Broad-spectrum sun protection Protective clothing and shade Avoidance of tanning beds Monthly self-skin examination Partner-assisted examination of difficult-to-see areas Smoking cessation Psychological support Adequate nutrition during systemic treatment Botanical and Supplement Safety Do not apply caustic “black salve” products. Avoid escharotic or corrosive botanical preparations. Do not delay biopsy for dietary or herbal treatment. Review antioxidant supplements during immunotherapy or radiation. Review bleeding-promoting supplements before biopsy or surgery. Avoid products promoted as cancer cures. Monitoring ● New or changing lesions ● Scar or local recurrence Lymph-node enlargement Unexplained weight loss Neurological or respiratory symptoms Treatment adverse effects Scheduled dermatology surveillance Single Best Next Step Prompt excisional biopsy that preserves accurate tumour-depth assessment. Clinical Pearl Evolution is often the most important ABCDE feature; a changing lesion deserves investigation. NPLEX Examination Trap Do not destroy a suspicious pigmented lesion before obtaining histopathology. Disease Overview Melanoma is a malignant tumour of melanocytes. Prognosis is strongly related to tumour depth and disease stage at diagnosis. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Suspected Cutaneous Melanoma.”

109

Stevens–Johnson Syndrome/Toxic Epidermal Necrolysis

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 34-year-old woman started lamotrigine three weeks ago. She now presents with fever, malaise, eye pain and a rapidly spreading painful rash. Examination ● Temperature: 39.2°C ● Heart rate: 118/min ● Widespread dusky erythematous macules Flaccid blisters Epidermal detachment with gentle pressure Painful oral erosions Bilateral conjunctival inflammation Genital mucosal erosions Skin pain greater than expected from the visible rash

Question 1 of 1NPLEX-SYS-109

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Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Lamotrigine-associated Stevens–Johnson syndrome/toxic epidermal necrolysis spectrum Differential Diagnosis Erythema multiforme major Staphylococcal scalded-skin syndrome Generalized bullous fixed-drug eruption DRESS syndrome Acute generalized exanthematous pustulosis Pemphigus vulgaris Linear IgA bullous dermatosis Severe thermal burn Key Investigations Immediate medication timeline CBC Electrolytes and renal function Liver tests Glucose Bicarbonate Cultures when infection is suspected Skin biopsy Assessment of detached body-surface area Ophthalmological examination ● Respiratory and genitourinary mucosal assessment ● Severity scoring according to specialist protocol Gold-Standard Diagnostic Approach Diagnosis is based on the clinical pattern, medication exposure and skin histopathology showing extensive epidermal necrosis. The spectrum is classified partly according to the percentage of detached or detachable body-surface area. Conventional Treatment Immediate withdrawal of all suspected nonessential drugs Specialized hospital admission Fluid, electrolyte and temperature management Nonadherent wound care Pain control Nutritional support Ocular treatment Respiratory and genitourinary monitoring Infection surveillance without routine prophylactic antibiotics Specialist-directed immunomodulatory treatment where appropriate Systemic immunomodulatory strategies remain an area of clinical debate, so the universally essential interventions are early drug withdrawal and expert supportive care. Naturopathic Treatment Plan There is no acute naturopathic treatment. After recovery: Record the culprit drug as a severe allergy. Wear medical-alert identification. Avoid structurally related medications when advised. Obtain ophthalmic, oral and genital follow-up. Receive psychological support. Use bland, specialist-recommended skin care. Avoid intentional drug rechallenge. Botanical and Supplement Safety Stop all nonessential supplements during the acute event. Avoid essential oils, herbal salves and adhesive products. Do not use echinacea or immune-stimulating formulas. Review all multi-ingredient products as potential drug exposures. Never rechallenge with the suspected culprit drug. Family members should not assume a similar-looking medication is safe. Monitoring Body-surface detachment Fluid balance Electrolytes Renal and liver function Temperature Infection Respiratory involvement Vision Oral intake Long-term mucosal scarring Urgent Referral Criteria Any painful blistering eruption with mucosal involvement following a new medication requires immediate emergency assessment. Single Best Next Step Stop the suspected medication immediately and transfer for specialized inpatient care. Clinical Pearl Skin pain and mucosal erosions are major warning signs that distinguish SJS/TEN from a simple medication rash. NPLEX Examination Trap Do not reassure a patient that a rash is minor because the total detached area is initially small; SJS/TEN can progress rapidly. Disease Overview SJS and TEN are severe immune-mediated reactions characterized by keratinocyte death, epidermal separation and mucosal injury, most often triggered by medication. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Stevens–Johnson Syndrome/Toxic Epidermal Necrolysis.”

110

Necrotizing Fasciitis

1 questions ·

GEA: Medical InterventionsSEA: Musculoskeletal, Rheumatological & Dermatological

System-based clinical case

A 58-year-old man with poorly controlled diabetes presents with rapidly worsening pain in the left lower leg two days after a minor puncture wound. Examination and Investigations Temperature: 39.3°C Blood pressure: 86/50 mmHg Heart rate: 132/min Respiratory rate: 28/min Severe pain extending beyond the visible erythema Rapidly spreading edema Dusky violaceous skin Hemorrhagic bullae Patchy skin anesthesia Crepitus WBC: 24 × 10⁹/L Lactate: 5.8 mmol/L Creatinine: Elevated Sodium: 128 mmol/L

Question 1 of 1NPLEX-SYS-110

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Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Necrotizing fasciitis with septic shock Differential Diagnosis Severe cellulitis Clostridial myonecrosis Pyomyositis Compartment syndrome Deep-vein thrombosis Ischemic limb Calciphylaxis Pyoderma gangrenosum Brown-recluse-type necrotic lesion Cutaneous anthrax Key Investigations Testing occurs during resuscitation and surgical preparation: CBC Electrolytes Creatinine Lactate Blood gas Creatine kinase Coagulation studies Blood cultures Operative tissue Gram stain and culture Plain radiograph, CT or MRI only if it does not delay surgery Serial perfusion and organ-function assessment Clinical scoring systems may support concern but cannot safely rule out necrotizing fasciitis. Gold-Standard Diagnostic Approach Immediate surgical exploration Operative findings may include: Necrotic fascia Thin gray fluid Lack of normal tissue resistance Poor bleeding Easily separated fascial planes Conventional Treatment Emergency surgical debridement Repeated debridement as needed Broad-spectrum IV antibiotics Toxin-suppressing antimicrobial therapy when streptococcal or clostridial disease is suspected Sepsis fluid and vasopressor treatment Intensive-care support Glycemic management Amputation when required for source control Reconstruction after infection is controlled Surgery and antibiotics are both typically necessary; antimicrobial treatment cannot penetrate or control extensive devitalized tissue without source control. Naturopathic Treatment Plan There is no acute naturopathic treatment. After recovery: Optimize diabetes control. Provide high-protein nutritional rehabilitation. Participate in wound and mobility rehabilitation. Stop smoking. Perform regular foot and skin inspection. Use appropriate wound hygiene. Receive psychological and amputation support when necessary. Botanical and Supplement Safety Do not apply poultices, caustic products or essential oils. Avoid oral supplements during shock or before emergency anesthesia. Review anticoagulant supplements before surgery. Avoid unregulated glucose-lowering products during critical illness. Do not use herbal antimicrobials instead of surgical source control. Avoid hyperbaric or adjunctive treatments when they delay debridement. Monitoring Blood pressure Lactate Urine output Extent of tissue injury Need for repeat surgery Renal and respiratory function Coagulation Glucose Culture results Wound healing Urgent Referral Criteria Pain out of proportion Rapidly spreading swelling or erythema Bullae Crepitus Skin anesthesia Dusky or necrotic skin Fever and hypotension Severe pain after minor trauma or surgery Rapid systemic deterioration Single Best Next Step Immediate operative exploration and debridement with simultaneous sepsis treatment. Clinical Pearl Severe pain may precede major visible skin changes because the infection begins in deeper fascia. NPLEX Examination Trap Do not wait for gas on imaging, crepitus or skin necrosis; these may be late findings. Disease Overview Necrotizing fasciitis is a rapidly progressive infection of fascia and adjacent soft tissues. Vascular thrombosis causes ischemia and necrosis, allowing infection and toxin-mediated systemic illness to advance quickly. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American College of Rheumatology, American Academy of Orthopaedic Surgeons, American Academy of Dermatology, or relevant specialty guideline for this case.
Current specialty-society guideline and current authorized product monograph relevant to “Necrotizing Fasciitis.”

111

Heparin-Induced Thrombocytopenia With New Thrombosis

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 66-year-old woman is hospitalized after hip-replacement surgery. She has received unfractionated heparin for venous-thromboembolism prophylaxis. On hospital day 7, she develops pain and swelling of the left leg. Examination and Investigations Blood pressure: 128/76 mmHg Heart rate: 94/min Left calf: Swollen and tender Admission platelet count: 238 × 10⁹/L Current platelet count: 92 × 10⁹/L Hemoglobin: Stable Creatinine: Normal Compression ultrasound: Acute proximal deep-vein thrombosis No active bleeding

Question 1 of 1NPLEX-SYS-111

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Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Heparin-induced thrombocytopenia with thrombosis Differential Diagnosis Postoperative thrombocytopenia Disseminated intravascular coagulation Sepsis Drug-induced immune thrombocytopenia Thrombotic thrombocytopenic purpura Dilutional thrombocytopenia Bone-marrow suppression Pseudothrombocytopenia Key Investigations Calculate the 4Ts score. Repeat CBC and review platelet trend. Peripheral blood smear PF4-heparin immunoassay Functional platelet-activation assay Compression ultrasound for suspected DVT Imaging for clinically suspected arterial or venous thrombosis Renal and liver function to guide anticoagulant selection Conventional Treatment Stop unfractionated and low-molecular-weight heparin. Remove heparin flushes and heparin-coated exposure where relevant. Begin therapeutic non-heparin anticoagulation. Select treatment according to renal function, liver function, bleeding risk, clinical stability and procedural needs. ● Delay warfarin until platelet recovery. ● Overlap warfarin appropriately with the non-heparin anticoagulant when warfarin is selected. ● Document HIT clearly in the medical record. Relevant Safety Issues ● Do not order testing in a clearly low-probability presentation without considering false-positive results. ● Do not stop anticoagulation merely because the platelet count is low when HIT is strongly suspected. ● Do not use low-molecular-weight heparin as a safe substitute. ● Do not start warfarin alone during acute thrombocytopenic HIT. ● HIT can occur after heparin has already been discontinued. Botanical and Supplement Safety ● Avoid nattokinase as a substitute for anticoagulation. ● Review Ginkgo biloba, concentrated Allium sativum, high-dose curcumin and high-dose omega-3 products because of bleeding risk. ● Avoid vitamin K supplements when warfarin is later used unless intake is medically coordinated. ● Do not use platelet-raising herbs as treatment for HIT. Monitoring Platelet count New thrombosis Limb perfusion Bleeding Renal and liver function Anticoagulant effect when relevant Platelet recovery before warfarin transition Single Best Next Step Discontinue every source of heparin and begin therapeutic non-heparin anticoagulation immediately. Clinical Pearl HIT is primarily a clotting disorder despite the low platelet count. NPLEX Examination Trap Do not transfuse platelets simply to correct the laboratory value in a stable patient with HIT. Disease Overview HIT is caused by antibodies against complexes of platelet factor 4 and heparin. Antibody-mediated platelet activation produces thrombocytopenia, excess thrombin generation and potentially catastrophic thrombosis. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Heparin-Induced Thrombocytopenia With New Thrombosis.”

112

Febrile Neutropenia During Chemotherapy

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 57-year-old woman receiving chemotherapy for breast cancer calls because of chills and weakness. Her last chemotherapy cycle was eight days ago. Examination and Investigations Temperature: 38.6°C Blood pressure: 92/56 mmHg Heart rate: 118/min Respiratory rate: 24/min Oral mucositis No obvious focal infection WBC: 0.7 × 10⁹/L Absolute neutrophil count: 0.2 × 10⁹/L Lactate: 3.4 mmol/L

Question 1 of 1NPLEX-SYS-112

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Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis High-risk febrile neutropenia with neutropenic sepsis Differential Diagnosis Viral infection Catheter-related bloodstream infection Bacterial pneumonia Neutropenic enterocolitis Urinary infection Invasive fungal infection Medication-induced fever Transfusion reaction Tumour fever Key Investigations Testing should not delay antimicrobials: Blood cultures from peripheral and central-line sites CBC with differential Electrolytes Kidney and liver function Lactate Urinalysis and urine culture Chest imaging when respiratory symptoms or instability are present Respiratory viral testing Stool testing when diarrhea is present ● Careful oral, skin, catheter and perianal examination without traumatic rectal procedures Conventional Treatment Immediate IV antipseudomonal antibiotic therapy IV crystalloid and sepsis management Oxygen and vasopressors when required Source control Addition of organism-specific coverage based on clinical findings and local epidemiology Antifungal assessment for persistent or recurrent fever during prolonged neutropenia Growth-factor treatment in selected high-risk situations Protective infection-control practices Relevant Safety Issues Do not delay antibiotics to obtain every specimen. Avoid rectal temperatures, enemas and traumatic rectal examinations. Do not rely on a normal chest radiograph to exclude early pneumonia. Avoid routine discharge in a hypotensive or clinically unstable patient. Fever may be absent in severely immunocompromised patients with infection. Botanical and Supplement Safety ● Avoid live microbial supplements during profound neutropenia unless the oncology team explicitly approves them. ● Avoid unregulated medicinal mushrooms or immune-stimulating formulas. ● Avoid herbal products that interact with chemotherapy metabolism. ● Do not use botanical antimicrobials as substitutes for IV antibiotics. ● Stop nonessential supplements during septic instability. Monitoring Temperature Blood pressure and lactate Absolute neutrophil count Kidney and liver function Culture results Mucositis Respiratory and abdominal symptoms Response to antimicrobial therapy Single Best Next Step Collect cultures rapidly and administer immediate empiric IV antibiotics without waiting for the results. Clinical Pearl A neutropenic patient may have a severe infection without pus, focal redness or striking examination findings. NPLEX Examination Trap Do not send a chemotherapy patient home because the fever is modest or the infection source is unclear. Disease Overview Febrile neutropenia is fever occurring during a severe reduction in neutrophil-mediated host defence. Infection can become invasive rapidly and may progress to septic shock before localizing signs appear. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Febrile Neutropenia During Chemotherapy.”

113

Metastatic Spinal Cord Compression

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 64-year-old man with metastatic prostate cancer reports two weeks of worsening thoracic back pain. The pain wakes him at night and is aggravated by coughing. During the past 24 hours, he has developed leg weakness and difficulty urinating. Examination Localized thoracic-spine tenderness Bilateral leg weakness Hyperreflexia Upgoing plantar responses ● Sensory level at approximately T8 ● Distended bladder ● Gait cannot be safely assessed

Question 1 of 1NPLEX-SYS-113

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Metastatic thoracic spinal cord compression Differential Diagnosis Vertebral metastases without cord compression Epidural abscess Epidural hematoma Pathological vertebral fracture Cauda equina syndrome Degenerative spinal stenosis Transverse myelitis Multiple myeloma Key Investigations Urgent whole-spine MRI CT when MRI is contraindicated CBC Calcium Kidney and liver function Coagulation studies Cancer-specific staging studies Bladder scan Assessment of spinal stability Tissue diagnosis when the malignancy is not established and obtaining tissue will not create unsafe delay Conventional Treatment ● Immediate specialist coordination ● Dexamethasone when neurological signs are present and no major contraindication overrides its use ● Spinal immobilization when instability is suspected ● Surgical decompression and stabilization in selected patients ● Urgent radiotherapy when surgery is unsuitable or according to tumour and stability factors ● Bladder and bowel management ● Thrombosis prevention ● Rehabilitation after definitive stabilization Relevant Safety Issues ● Do not force the patient to walk. ● Do not delay imaging for routine physiotherapy. ● Steroids can worsen hyperglycemia and infection risk but may be necessary to reduce cord edema. ● Maintain pressure-area care during immobilization. ● Preserve the patient’s current neurological function through rapid action. Botanical and Supplement Safety Avoid spinal manipulation and forceful massage. Do not use sedating botanical analgesics that obscure neurological progression. Review supplements that increase bleeding before possible surgery. Avoid high-dose calcium in patients with malignancy-associated hypercalcemia. Do not delay radiotherapy or surgery for alternative cancer treatment. Monitoring Motor strength Sensory level Bladder and bowel function Pain Spinal stability Glucose during corticosteroid therapy Thromboembolism and pressure injuries Response after surgery or radiotherapy Single Best Next Step Activate the metastatic spinal cord compression pathway and obtain urgent whole-spine MRI. Clinical Pearl The ability to walk before treatment is a major predictor of maintaining ambulation afterward. NPLEX Examination Trap Do not wait for complete paralysis or incontinence before recognizing cord compression. Disease Overview Metastatic spinal cord compression usually results from vertebral metastatic disease extending into the epidural space. Progressive compression causes ischemia, edema and irreversible neural injury. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Metastatic Spinal Cord Compression.”

114

Active Pulmonary Tuberculosis

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 38-year-old man who recently immigrated from a region with a high tuberculosis burden presents with three months of cough, weight loss, night sweats and intermittent hemoptysis. Examination and Investigations Temperature: 37.9°C BMI: 18 kg/m² Cervical lymphadenopathy Chest radiograph: Right-upper-lobe cavitary lesion Sputum molecular test: Mycobacterium tuberculosis detected Smear: Acid-fast bacilli present HIV status: Unknown

Question 1 of 1NPLEX-SYS-114

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Smear-positive cavitary pulmonary tuberculosis Differential Diagnosis Nontuberculous mycobacterial infection Lung abscess Fungal pulmonary infection Cavitating lung cancer Granulomatosis with polyangiitis Chronic bacterial pneumonia Sarcoidosis Septic pulmonary emboli Key Investigations Multiple sputum specimens for smear and culture Molecular resistance testing Full drug-susceptibility testing CBC Liver and kidney function HIV testing Hepatitis testing when clinically indicated Baseline visual assessment before ethambutol Pregnancy testing where relevant Chest imaging Evaluation of close contacts through public health Conventional Treatment Guideline-based multidrug therapy Directly observed or otherwise supported treatment when appropriate Pyridoxine with isoniazid in patients at increased neuropathy risk Adjustment based on susceptibility results Monitoring for hepatotoxicity, neuropathy, visual toxicity and drug interactions Nutrition and social support Public-health determination of infectiousness and isolation duration Relevant Safety Issues ● Rifampin has extensive drug interactions and can reduce the effectiveness of hormonal contraception and many other medications. ● Isoniazid can cause hepatotoxicity and peripheral neuropathy. ● Ethambutol can cause optic toxicity. ● Pyrazinamide can cause hepatotoxicity and hyperuricemia. ● Do not allow fear of stigma to interfere with prompt public-health management. Botanical and Supplement Safety Avoid alcohol. Avoid hepatotoxic botanicals, including kava, comfrey and chaparral. Review concentrated green-tea extract. Hypericum perforatum may interact with rifamycin-containing regimens and other medications. ● Do not use immune supplements or herbal antimicrobials as substitutes for TB medication. Monitoring Symptoms and weight Sputum conversion Medication adherence Liver function Vision Neuropathy Drug interactions Contact investigation Treatment completion Single Best Next Step Implement airborne precautions and begin public-health-coordinated multidrug treatment. Clinical Pearl A positive TB immune test does not distinguish latent from active disease; symptoms, imaging and microbiology determine active TB. NPLEX Examination Trap Do not wait for final culture susceptibility results before beginning an appropriate initial multidrug regimen in confirmed active disease. Disease Overview Tuberculosis is an airborne infection caused by the Mycobacterium tuberculosis complex. Active pulmonary disease may produce cough, weight loss, fever, night sweats, hemoptysis and cavitation. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Active Pulmonary Tuberculosis.”

115

Infective Endocarditis

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 45-year-old man with a prosthetic aortic valve presents with two weeks of fever, fatigue and night sweats. He recently completed an oral antibiotic prescribed for presumed sinusitis. Examination and Investigations Temperature: 38.5°C Heart rate: 108/min New regurgitant murmur Splinter hemorrhages Tender fingertip nodules Microscopic hematuria CRP: Elevated Hemoglobin: 102 g/L Hemodynamically stable

Question 1 of 1NPLEX-SYS-115

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Prosthetic-valve infective endocarditis Differential Diagnosis Occult malignancy Systemic lupus erythematosus ANCA-associated vasculitis Atrial myxoma Nonbacterial thrombotic endocarditis Tuberculosis Infected vascular graft Drug fever Key Investigations Multiple blood-culture sets from separate venipunctures CBC Kidney and liver function ESR and CRP Urinalysis ECG Transthoracic echocardiography Transesophageal echocardiography, especially with prosthetic valves Additional imaging for embolic, abscess or prosthetic-valve complications Identification of previous antibiotic exposure Gold-Standard Diagnostic Approach Diagnosis is established through integration of: Microbiology Echocardiographic or advanced imaging evidence Predisposing cardiac disease Clinical vascular and immunological features Conventional Treatment ● Prolonged IV culture-directed antibiotics ● Infectious-disease and cardiology consultation ● Surgical assessment for heart failure, uncontrolled infection, abscess, prosthetic-valve dysfunction or recurrent embolization ● Monitoring for stroke, kidney injury and conduction abnormalities ● Removal of infected devices when indicated Relevant Safety Issues ● If the patient is septic or unstable, cultures should be collected rapidly, but antibiotics must not be dangerously delayed. ● Avoid intramuscular injections when anticoagulated. ● New conduction delay may indicate a perivalvular abscess. ● New neurological deficits require urgent assessment for embolic stroke or intracranial hemorrhage. ● Anticoagulation decisions in prosthetic-valve endocarditis require specialist assessment. Botanical and Supplement Safety Do not substitute herbal antimicrobials for IV antibiotics. Review anticoagulant supplements if surgery is possible. Avoid nephrotoxic herbs during aminoglycoside or other renal-risk therapy. Avoid hepatotoxic botanicals with prolonged antimicrobial regimens. Do not assume “natural blood thinners” prevent septic emboli. Monitoring Blood-culture clearance Fever Murmur and heart failure Renal function Neurological findings ECG conduction Antibiotic toxicity Embolic complications Valve function Single Best Next Step Collect multiple blood-culture sets before antibiotics because the patient is currently stable. Clinical Pearl Prior antibiotic exposure is a common cause of culture-negative endocarditis. NPLEX Examination Trap Do not diagnose autoimmune vasculitis from hematuria and skin findings before considering infective endocarditis. Disease Overview Infective endocarditis is microbial infection of the endocardial surface, usually involving a valve. Complications include valvular destruction, heart failure, abscess, embolization and immune-complex injury. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Infective Endocarditis.”

116

Ruptured Ectopic Pregnancy

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 30-year-old woman presents with sudden severe lower-abdominal pain, dizziness and vaginal spotting. Her last menstrual period was seven weeks ago. Examination and Investigations Blood pressure: 78/46 mmHg Heart rate: 132/min Skin: Pale and clammy Generalized lower-abdominal tenderness with guarding Positive pregnancy test Hemoglobin: 84 g/L Bedside ultrasound: ○ No definite intrauterine pregnancy ○ Large amount of free intraperitoneal fluid

Question 1 of 1NPLEX-SYS-116

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Ruptured tubal ectopic pregnancy with hemorrhagic shock Differential Diagnosis Ruptured hemorrhagic ovarian cyst Ovarian torsion Early pregnancy loss Acute appendicitis Pelvic inflammatory disease Renal colic Ruptured corpus-luteum cyst Heterotopic pregnancy Key Investigations Investigations occur during resuscitation: Quantitative hCG CBC Type and crossmatch Rh status Electrolytes and renal function Coagulation studies Transvaginal ultrasound Bedside focused ultrasound in unstable patients Conventional Treatment Immediate IV access and resuscitation Blood-product treatment Emergency laparoscopy or laparotomy according to stability and resources Salpingectomy or selected salpingostomy Rh immune globulin when indicated Pathological confirmation Follow-up hCG when residual trophoblastic tissue is possible Fertility and future early-pregnancy counselling Relevant Safety Issues ● Do not allow a single hCG value to delay treatment in a shocked patient. ● Shoulder-tip pain can reflect diaphragmatic irritation from intraperitoneal blood. ● A previously reported intrauterine pregnancy does not completely exclude heterotopic pregnancy, especially after assisted reproduction. ● Preserve fertility when possible, but maternal stabilization is the priority. Botanical and Supplement Safety Do not use botanicals intended to induce menstruation or pregnancy loss. Avoid oral supplements in a patient requiring emergency anesthesia. Review bleeding-promoting products. Do not use high-dose vitamin C, parsley, pennyroyal or essential oils as pregnancy treatments. ● Avoid pennyroyal because it can cause fatal hepatotoxicity. Monitoring Hemodynamics Hemoglobin Ongoing bleeding hCG when indicated Surgical complications Emotional recovery Future early ultrasound planning Single Best Next Step Resuscitate and proceed to emergency operative management. Clinical Pearl A pregnancy of unknown location plus instability is an ectopic emergency, not an outpatient diagnostic problem. NPLEX Examination Trap Do not give methotrexate to a patient with shock, hemoperitoneum or suspected rupture. Disease Overview Ectopic pregnancy occurs when implantation takes place outside the endometrial cavity, most commonly in a fallopian tube. Tubal rupture can cause massive intraperitoneal hemorrhage. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Ruptured Ectopic Pregnancy.”

117

Postpartum Hemorrhage From Uterine Atony

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 33-year-old woman has a vaginal delivery after prolonged labour with oxytocin augmentation. Ten minutes after delivery of the placenta, she develops heavy vaginal bleeding. Examination and Investigations Blood pressure: 88/54 mmHg Heart rate: 124/min Uterus: Enlarged, soft and poorly contracted Placenta appears complete No obvious major genital-tract laceration Continuous brisk bleeding Estimated blood loss: Rapidly increasing

Question 1 of 1NPLEX-SYS-117

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Primary postpartum hemorrhage caused by uterine atony Differential Diagnosis Retained placenta Genital-tract laceration Uterine inversion Uterine rupture Placenta accreta spectrum Disseminated intravascular coagulation Concealed hematoma Amniotic-fluid embolism with coagulopathy Key Investigations Treatment must not wait: CBC Type and crossmatch Coagulation studies Fibrinogen Electrolytes Blood gas and lactate Bedside evaluation for retained tissue Ultrasound when it will assist management without delaying treatment Conventional Treatment Uterine massage Oxytocin Additional uterotonics selected according to contraindications Early tranexamic-acid consideration within the hemorrhage protocol IV fluid and blood-component resuscitation Removal of retained placental tissue Repair of lacerations Uterine balloon tamponade Uterine-artery embolization Compression sutures Hysterectomy for uncontrolled hemorrhage Relevant Safety Issues Avoid methylergonovine in severe hypertension or preeclampsia. Avoid carboprost in significant asthma. Monitor for pulmonary edema during aggressive resuscitation. Hypothermia, acidosis and coagulopathy intensify hemorrhage. Visual estimation commonly underestimates blood loss. Botanical and Supplement Safety Do not use herbal uterotonics during an obstetric hemorrhage. Avoid blue cohosh, which has been associated with cardiovascular toxicity. Do not use pennyroyal or concentrated essential oils. Stop bleeding-promoting supplements. Oral remedies must not delay uterotonic and procedural treatment. Monitoring Blood loss Uterine tone Blood pressure and pulse Mental status Urine output Hemoglobin Fibrinogen and coagulation Response to uterotonics Postpartum anemia and psychological effects Single Best Next Step Begin uterine massage and uterotonic treatment while activating full hemorrhage resuscitation. Clinical Pearl A soft, boggy uterus points toward tone; a firm uterus with ongoing bleeding points toward trauma or another cause. NPLEX Examination Trap Do not administer a contraindicated uterotonic without checking for asthma or severe hypertension. Disease Overview Postpartum hemorrhage is excessive bleeding after birth. Uterine atony prevents normal myometrial compression of placental-site vessels and may cause rapid circulatory collapse. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Postpartum Hemorrhage From Uterine Atony.”

118

Infant Bronchiolitis With Hypoxemia and Poor Feeding

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 4-month-old infant presents with three days of nasal congestion followed by cough, wheezing and difficulty feeding. Examination Temperature: 37.8°C Heart rate: 154/min Respiratory rate: 62/min Oxygen saturation: 87% on room air Nasal flaring and subcostal retractions Diffuse crackles and wheezing Breastfeeds for only a few seconds at a time ● Fewer wet diapers ● No focal lobar findings

Question 1 of 1NPLEX-SYS-118

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Moderate-to-severe viral bronchiolitis with hypoxemia and dehydration risk Differential Diagnosis Viral-induced wheeze Pneumonia Pertussis Congenital heart disease Foreign-body aspiration Cystic fibrosis Gastroesophageal aspiration Sepsis Heart failure Key Investigations Typical bronchiolitis usually does not require extensive testing. Consider: Continuous or intermittent oxygen monitoring Blood gas when respiratory failure is suspected Viral testing when needed for cohorting or infection control Chest radiograph only for atypical disease, severe deterioration or suspected complication ● Electrolytes when IV fluid is needed or dehydration is significant Conventional Treatment Oxygen Gentle superficial nasal suction Frequent small feeds when safe Nasogastric or IV hydration when feeding is inadequate High-flow nasal support or other respiratory assistance when needed ● Infection-control precautions ● Monitoring of high-risk infants, including young age, prematurity, cardiopulmonary disease or immunodeficiency Relevant Safety Issues Avoid deep repetitive suctioning that causes trauma. Do not force oral feeding during marked tachypnea. Monitor young infants for apnea. Avoid routine salbutamol trials unless an alternative diagnosis is being considered under an appropriate protocol. ● Avoid cough and cold medicines in infants. Botanical and Supplement Safety Do not give honey before 12 months. Avoid menthol, camphor and essential oils near the nose or airway. Avoid herbal cough syrups. Avoid direct steam exposure because of burn risk. Do not use echinacea or elderberry as substitutes for respiratory monitoring. Monitoring Oxygen saturation Work of breathing Apnea Feeding Urine output Hydration Fatigue and mental status Need for respiratory support Single Best Next Step Admit for oxygenation and hydration support. Clinical Pearl Feeding ability is an important measure of severity in infant bronchiolitis. NPLEX Examination Trap Do not treat the sound of wheezing alone; assess oxygenation, respiratory effort and hydration. Disease Overview Bronchiolitis is an acute viral infection of the small airways in infants. Edema, epithelial injury and mucus obstruct narrow bronchioles, increasing respiratory work. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Infant Bronchiolitis With Hypoxemia and Poor Feeding.”

119

Sentinel Bruising in a Nonmobile Infant

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

A 3-month-old infant is brought for routine care. During examination, the clinician notices a 2-cm bruise on the infant’s cheek and a healing tear of the upper labial frenulum. The caregiver states that the infant “must have rolled against the crib,” but the infant is not yet able to roll independently. Examination Infant is alert Weight gain is below expected trajectory No known bleeding disorder No birth-related explanation No documentation of a previous medical evaluation Caregiver repeatedly answers for the other parent

Question 1 of 1NPLEX-SYS-119

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Sentinel injury concerning for possible physical abuse Differential Diagnosis Accidental trauma Bleeding disorder Birthmark or dermal melanocytosis Cultural skin practice Intraoral feeding trauma Dermatologic lesion Osteogenesis imperfecta or another bone-fragility disorder Factitious injury Key Investigations Evaluation is individualized and guided by age and findings: Full undressed physical examination Careful documentation, measurements and medically appropriate photographs CBC and platelets Coagulation studies when indicated Skeletal survey in the appropriate age and risk context Neuroimaging when head injury is possible Ophthalmologic examination when abusive head trauma is suspected Liver and pancreatic injury screening in selected cases Child-protection consultation Conventional Management Protect the child from immediate danger. Involve social work and child-protection specialists. Report reasonable suspicion according to jurisdictional law. Treat identified injuries. Evaluate siblings or other children when appropriate through safeguarding processes. Arrange a safe discharge plan only after protection has been addressed. Maintain neutral, precise medical documentation. Relevant Safety Issues ● Do not promise confidentiality that conflicts with mandatory safeguarding duties. ● Do not conduct an accusatory interrogation. ● Do not interview caregivers together when separate histories are important. ● Do not send the child back into a potentially unsafe environment without appropriate assessment. ● A normal initial appearance does not exclude occult fractures or intracranial injury. Botanical and Supplement Safety Do not apply topical products that alter the appearance of bruises before documentation. Ask about traditional remedies or skin practices neutrally. Evaluate any herbal products given to the infant for toxicity or sedation. Do not assume a cultural explanation without confirming that it fits the injury pattern and developmental history. Monitoring Identified injuries Neurological status Feeding and growth Follow-up skeletal imaging when recommended Safety-plan implementation Attendance at medical follow-up Well-being of siblings Single Best Next Step Begin immediate safeguarding and occult-injury evaluation rather than waiting for further evidence. Clinical Pearl “Those who don’t cruise rarely bruise.” Bruising in a precruising infant requires careful evaluation. NPLEX Examination Trap Do not require certainty or a confession before making a child-protection report where reasonable suspicion meets the legal threshold. Disease Overview Sentinel injuries are minor but unusual injuries that may be the first recognized evidence of physical abuse. Early identification provides an opportunity to prevent escalation to severe or fatal trauma. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Sentinel Bruising in a Nonmobile Infant.”

120

Suspected Elder Abuse and Financial Exploitation

1 questions ·

GEA: Medical InterventionsSEA: Hematology, Oncology, Infectious, Reproductive, Pediatric & Geriatric

System-based clinical case

An 84-year-old woman is brought by her adult grandson for medication refills. She appears anxious and looks toward him before answering questions. The grandson states that she is “confused” and must not be interviewed alone. Examination and History Several bruises of different ages on the upper arms Poor hygiene Weight loss of 6 kg Pressure injury over the sacrum Medications have not been refilled consistently The grandson recently became joint owner of her bank account When briefly alone, the patient whispers, “He gets angry when I ask about my money.” She appears able to understand questions and describe her wishes

Question 1 of 1NPLEX-SYS-120

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Suspected elder abuse, neglect and financial exploitation Differential Diagnosis Accidental falls Anticoagulant-associated bruising Coagulation disorder Cognitive impairment with self-neglect Depression Caregiver burnout without intentional abuse Delirium Severe poverty or inability to access care Pressure injury from unavoidable advanced illness Key Investigations Private patient interview Cognitive and decision-specific capacity assessment Complete medication reconciliation Full skin and injury examination Weight and nutritional assessment CBC Electrolytes and kidney function Coagulation studies when indicated Imaging for suspected fractures or head injury Assessment for depression, delirium and dementia Review of living arrangements, finances and access to food and medication Conventional Management Treat urgent injuries, dehydration, malnutrition or infection. Determine whether the patient can return home safely. Involve social work and safeguarding services. Follow local reporting requirements. Contact emergency services when there is immediate danger. Develop a safe discharge or alternative-placement plan. Respect the decisions of a capable patient while providing realistic safety options. Consider legal, financial and advocacy support. Relevant Safety Issues ● Do not confront the suspected abuser in a manner that increases danger. ● Do not leave written safety information where a controlling caregiver may discover it. ● Do not equate an unwise decision with incapacity. ● Do not assume that abuse requires visible physical injury. ● Ensure hearing, language and communication needs do not impair the assessment. Botanical and Supplement Safety ● Review sedating supplements that may increase falls or be administered without the patient’s informed consent. ● Check for medication withholding or substitution with unregulated products. ● Avoid assuming the patient is nonadherent before assessing whether the caregiver controls access. ● Evaluate herbal products for anticoagulant effects when bruising is present. Monitoring Immediate safety Nutrition and weight Pressure injuries Medication access Mood and cognition Financial protection Follow-up attendance Recurrence of injury Caregiver access and behaviour Single Best Next Step Separate the patient from the accompanying caregiver for a private, safety-focused assessment and initiate safeguarding action. Clinical Pearl Capacity is specific to the particular decision; an older adult may have cognitive impairment and still retain capacity for many choices. NPLEX Examination Trap Do not accept a caregiver’s claim of incapacity without independently assessing the patient. Disease Overview Elder abuse includes physical, psychological and sexual abuse, neglect, abandonment and financial exploitation. It can occur in private homes, institutions and dependent-care relationships. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current guideline from the relevant hematology, oncology, infectious-disease, obstetric, pediatric, or geriatric specialty organization.
Current specialty-society guideline and current authorized product monograph relevant to “Suspected Elder Abuse and Financial Exploitation.”

121

Severe Hyperkalemia With ECG Changes

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 72-year-old man with chronic kidney disease, heart failure and hypertension presents with generalized weakness and palpitations. He recently began spironolactone while continuing ramipril. He also started an over-the-counter potassium supplement after reading that it could prevent muscle cramps. Examination and Investigations Blood pressure: 104/66 mmHg Heart rate: 48/min Respiratory rate: 20/min Generalized muscle weakness Potassium: 7.2 mmol/L Creatinine: 248 µmol/L Bicarbonate: 17 mmol/L Glucose: 7.8 mmol/L ECG: ○ Tall peaked T waves ○ Prolonged PR interval ○ Widening QRS complex

Question 1 of 1NPLEX-SYS-121

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe medication- and supplement-associated hyperkalemia with cardiotoxicity Differential Diagnosis Pseudohyperkalemia from hemolyzed blood sample Acute kidney injury Metabolic acidosis Adrenal insufficiency Rhabdomyolysis Tumour lysis syndrome Digoxin toxicity Potassium-containing salt-substitute toxicity Type 4 renal tubular acidosis Key Investigations Treatment must proceed while testing continues: Repeat potassium using a rapidly processed nonhemolyzed sample Continuous ECG monitoring Glucose Creatinine and eGFR Bicarbonate and blood gas Magnesium and calcium Creatine kinase when muscle injury is suspected Medication and supplement reconciliation Urine output Digoxin level when clinically relevant Conventional Treatment Immediate IV calcium for ECG changes IV insulin with glucose Inhaled beta-2-agonist therapy Frequent glucose monitoring Correction of significant metabolic acidosis where appropriate Potassium removal with a binder, loop diuresis when appropriate or dialysis Stop potassium supplements and contributing medications temporarily Urgent nephrology involvement when severe kidney dysfunction or refractory hyperkalemia is present Relevant Safety Issues ● Calcium stabilizes the heart but does not lower serum potassium. Insulin can cause delayed hypoglycemia, especially in kidney disease. A normal ECG does not completely exclude dangerous hyperkalemia. Potassium may rebound after temporary intracellular shifting. Salt substitutes frequently contain potassium chloride. Botanical and Supplement Safety Avoid or carefully review: Potassium supplements Potassium-containing electrolyte powders Potassium-based salt substitutes Taraxacum officinale products marketed as potassium-rich Concentrated coconut-water products in advanced kidney disease Herbal diuretics taken with ACE inhibitors, ARBs or mineralocorticoid-receptor antagonists Monitoring Continuous cardiac rhythm Repeat potassium Glucose after insulin Creatinine Bicarbonate Urine output Recurrence after initial treatment Medication plan before discharge Single Best Next Step Stabilize the cardiac membrane immediately with IV calcium and begin definitive hyperkalemia treatment. Clinical Pearl In severe hyperkalemia, treat the ECG—not merely the laboratory number. NPLEX Examination Trap Do not assume that an oral potassium binder provides sufficiently rapid treatment for ECG instability. Disease Overview Hyperkalemia reduces the normal electrical gradient across cardiac and skeletal-muscle membranes. Progressive toxicity may cause weakness, conduction block, ventricular arrhythmias and asystole. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Severe Hyperkalemia With ECG Changes.”

122

Postpartum Pulmonary Embolism

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 35-year-old woman presents eight days after cesarean delivery with sudden shortness of breath, pleuritic chest pain and light-headedness. She has spent much of the postpartum period in bed because of incisional pain. Examination and Investigations Blood pressure: 102/64 mmHg Heart rate: 128/min Respiratory rate: 30/min Oxygen saturation: 88% on room air Temperature: 37.2°C Right calf circumference is 3 cm greater than the left Right calf is tender Chest auscultation: No focal crackles ECG: Sinus tachycardia

Question 1 of 1NPLEX-SYS-122

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Postpartum deep-vein thrombosis with acute pulmonary embolism Differential Diagnosis ● Peripartum cardiomyopathy ● Pneumonia Pneumothorax Acute coronary syndrome Amniotic-fluid embolism Postpartum anxiety Aortic dissection Severe anemia Sepsis Key Investigations Immediate oxygenation and hemodynamic assessment Compression ultrasound of the symptomatic leg CT pulmonary angiography or ventilation-perfusion imaging CBC Creatinine Coagulation studies ECG Troponin and natriuretic peptide in selected cases Echocardiography when right-heart strain or instability is suspected Gold-Standard Diagnostic Approach Pulmonary vascular imaging confirms PE. A positive proximal-leg ultrasound in a compatible presentation may establish VTE and allow treatment without additional chest imaging in selected circumstances. Conventional Treatment Supplemental oxygen Therapeutic anticoagulation Low-molecular-weight heparin when appropriate Unfractionated heparin when rapid reversal or an invasive procedure may be required Hemodynamic support Thrombolysis, catheter treatment or surgical embolectomy for selected high-risk unstable PE ● Treatment for at least the guideline-recommended duration ● Postpartum and breastfeeding-compatible medication selection Relevant Safety Issues ● Assess cesarean wound bleeding and postpartum hemorrhage risk. ● Do not delay treatment in a deteriorating patient. ● Direct oral anticoagulant use during breastfeeding requires drug-specific specialist assessment. ● Warfarin and heparin-based therapy can be used in breastfeeding under appropriate clinical supervision. ● Massive PE may present with syncope or shock rather than prominent chest pain. Botanical and Supplement Safety ● Avoid nattokinase as an anticoagulant substitute. ● Avoid high-dose garlic, ginkgo and curcumin during therapeutic anticoagulation without review. ● Avoid estrogen-containing contraception in the early period after pregnancy-associated VTE unless a specialist determines otherwise. ● Do not massage a leg with suspected DVT. Monitoring Oxygenation Blood pressure Right-heart strain Bleeding Platelet count when heparin is used Cesarean wound Leg swelling Anticoagulant adherence Recurrent thromboembolism symptoms Single Best Next Step Transfer for immediate PE assessment and begin treatment promptly when the clinical probability and bleeding assessment support it. Clinical Pearl Postpartum dyspnea should not automatically be attributed to anxiety, deconditioning or normal recovery. NPLEX Examination Trap Do not use an isolated D-dimer result to dismiss a high-risk postpartum presentation. Disease Overview Pregnancy and the postpartum period promote venous stasis, vascular injury and increased coagulation. Pulmonary embolism occurs when thrombus, usually originating in a deep leg or pelvic vein, obstructs the pulmonary circulation. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Postpartum Pulmonary Embolism.”

123

“Triple-Whammy” Acute Kidney Injury

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 76-year-old woman with hypertension and osteoarthritis develops gastroenteritis with vomiting and diarrhea. Her medications include: Ramipril Hydrochlorothiazide Metformin Ibuprofen taken several times daily A concentrated turmeric and willow-bark pain formula Three days later, she presents with weakness and reduced urine output. Examination and Investigations Blood pressure: 88/54 mmHg Heart rate: 112/min Dry mucous membranes Creatinine: 276 µmol/L; baseline 92 µmol/L Potassium: 5.8 mmol/L Bicarbonate: 16 mmol/L Lactate: Mildly elevated Urinalysis: Concentrated urine without active sediment Bladder scan: No retention

Question 1 of 1NPLEX-SYS-123

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Hemodynamically mediated acute kidney injury from dehydration, ACE-inhibitor, diuretic and NSAID exposure Differential Diagnosis Acute tubular injury Sepsis-associated AKI Glomerulonephritis Acute interstitial nephritis Urinary obstruction Renal-artery stenosis Rhabdomyolysis Hepatorenal syndrome Thrombotic microangiopathy Key Investigations Repeat electrolytes and creatinine ECG Blood gas and lactate CBC Urinalysis and sediment Urine output Bladder scan Renal ultrasound when obstruction is possible Creatine kinase when muscle injury is suspected Full medication and supplement history Conventional Treatment ● Stop NSAIDs ● Temporarily hold ACE inhibitor, diuretic and metformin during severe dehydration and AKI ● IV isotonic crystalloid ● Treat hyperkalemia ● Treat infection or other precipitating illness ● Adjust all medication doses for current kidney function ● Dialysis for refractory hyperkalemia, severe acidosis, pulmonary edema or uremic complications ● Reintroduce necessary medications carefully after recovery Relevant Safety Issues ● Metformin should be withheld during severe hypoperfusion or AKI because accumulation may increase lactic-acidosis risk. ● NSAIDs may reduce renal afferent blood flow. ● ACE inhibitors reduce efferent arteriolar tone and can worsen filtration during severe hypovolemia. ● Diuretics may exacerbate volume loss. ● Older adults may develop severe AKI before obvious hypotension is recognized. Botanical and Supplement Safety ● Willow bark has salicylate-like effects and may increase renal and bleeding risks. ● High-dose curcumin may increase bleeding when combined with NSAIDs or anticoagulants. ● Avoid strong diuretic herbs during dehydration. ● Avoid potassium-containing electrolyte powders in AKI. ● Do not assume “natural pain relief” products are kidney-neutral. Monitoring Blood pressure Urine output Potassium Creatinine Bicarbonate Lactate Fluid balance Pulmonary edema Medication reintroduction Single Best Next Step Restore circulation, stop nephrotoxic or hemodynamically harmful agents temporarily and treat the hyperkalemic AKI urgently. Clinical Pearl A medication that is beneficial during stable chronic disease may become hazardous during severe dehydration. NPLEX Examination Trap Do not treat oliguria reflexively with more diuretic before assessing volume depletion and kidney perfusion. Disease Overview Acute kidney injury is an abrupt decline in renal filtration. Reduced perfusion, toxic exposure, intrinsic kidney injury and urinary obstruction are major mechanistic categories. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to ““Triple-Whammy” Acute Kidney Injury.”

124

Opioid Overdose With Respiratory Depression

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 27-year-old man is found unresponsive in a public washroom. An opened packet of powder and a used syringe are nearby. Examination Unresponsive to voice Minimal response to painful stimulus Respiratory rate: 4/min Shallow breathing Oxygen saturation: 71% Heart rate: 54/min Blood pressure: 88/52 mmHg Pupils: Pinpoint Skin: Cool Glucose: 6.1 mmol/L

Question 1 of 1NPLEX-SYS-124

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe opioid overdose with respiratory failure Differential Diagnosis Sedative-hypnotic overdose Hypoglycemia Brainstem stroke Intracranial hemorrhage Clonidine toxicity Organophosphate poisoning Carbon monoxide poisoning Postictal state Severe alcohol intoxication Key Investigations Treatment should not be delayed: Continuous oxygen saturation Capnography when available Blood gas ECG Electrolytes and creatinine Acetaminophen and salicylate levels in uncertain overdose Pregnancy testing when relevant Chest imaging for aspiration Toxicology testing as an adjunct, not a prerequisite Conventional Treatment Airway positioning Assisted ventilation Naloxone titrated to restore adequate breathing Supplemental oxygen Intubation when ventilation cannot be maintained Observation for recurrent sedation Evaluation for aspiration, pulmonary edema and rhabdomyolysis Connection to opioid-use-disorder treatment after recovery Provision of take-home naloxone Relevant Safety Issues ● The treatment target is adequate ventilation, not necessarily full alertness. ● Abrupt complete reversal may precipitate severe withdrawal, vomiting and agitation. ● Potent synthetic opioids may require repeated naloxone. ● Xylazine and other non-opioid sedatives may cause persistent depression despite naloxone; ventilation remains essential. ● Never leave the person alone after naloxone administration. Botanical and Supplement Safety Avoid kratom as an unsupervised opioid substitute. Avoid combining opioids with alcohol, benzodiazepines, kava or sedating sleep formulas. “Natural” pain products may contain undisclosed psychoactive substances. Do not use stimulants to counteract opioid sedation. Provide naloxone education to patients and household members. Monitoring Respiratory rate and depth Oxygenation and carbon dioxide Mental status Recurrent respiratory depression Aspiration Pulmonary edema Withdrawal Self-harm risk Readiness for addiction treatment Single Best Next Step Ventilate immediately and administer naloxone. Clinical Pearl Naloxone cannot replace airway and ventilation support. NPLEX Examination Trap Do not wait for pinpoint pupils or a positive drug screen before treating otherwise convincing opioid respiratory depression. Disease Overview Opioids activate central mu receptors and suppress the brainstem respiratory drive. Death usually results from hypoventilation, hypoxemia and subsequent cardiac arrest. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Opioid Overdose With Respiratory Depression.”

125

Severe Alcohol Withdrawal Delirium

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 52-year-old man who drinks approximately one litre of spirits daily is admitted for acute pancreatitis. He has not consumed alcohol for three days. He becomes increasingly agitated and reports seeing insects crawling over the walls. Examination and Investigations Temperature: 38.3°C Blood pressure: 184/104 mmHg Heart rate: 136/min Respiratory rate: 26/min Profuse sweating Marked tremor Severe agitation Disorientation Visual hallucinations Potassium: Low Magnesium: Low

Question 1 of 1NPLEX-SYS-125

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Alcohol withdrawal delirium, formerly delirium tremens Differential Diagnosis ● Sepsis-associated delirium ● Wernicke encephalopathy Hepatic encephalopathy Hypoglycemia Meningitis or encephalitis Serotonin toxicity Neuroleptic malignant syndrome Sedative-hypnotic withdrawal Stimulant intoxication Key Investigations Point-of-care glucose CBC Electrolytes Magnesium and phosphate Liver and renal function Blood gas when severe illness is present ECG Infection evaluation Toxicology when mixed exposure is possible Assessment for trauma, pancreatitis and gastrointestinal bleeding Conventional Treatment Benzodiazepine therapy titrated to clinical response ICU monitoring when severe or resistant Thiamine Fluid and electrolyte correction Treatment of hypoglycemia Magnesium replacement when deficient Treatment of infection or another precipitating illness Phenobarbital-based adjunct or protocol in selected monitored settings Alcohol-use-disorder treatment after stabilization Relevant Safety Issues ● Thiamine should be provided promptly, but emergency glucose should not be withheld from a hypoglycemic patient. ● Symptom scales may be unreliable in delirium or severe medical illness. ● Monitor for respiratory depression when sedatives are escalated. ● Antipsychotics should not be used as sole withdrawal treatment. ● Withdrawal can occur despite a detectable blood-alcohol concentration. Botanical and Supplement Safety Avoid valerian, kava and other sedatives during benzodiazepine treatment. Do not give concentrated herbal alcohol tinctures. Avoid unregulated “detox” products. Avoid excessive niacin or hepatotoxic botanicals in liver disease. Do not replace medical withdrawal management with supplements. Monitoring Agitation and orientation Seizures Blood pressure and heart rate Respiratory status Temperature Potassium, magnesium and phosphate Hydration Aspiration and falls Single Best Next Step Administer monitored benzodiazepine treatment with thiamine and correction of metabolic abnormalities. Clinical Pearl Alcohol withdrawal is a spectrum; delirium with autonomic instability is a medical emergency. NPLEX Examination Trap Do not use a beta-blocker or antipsychotic to normalize the vital signs while leaving the withdrawal process untreated. Disease Overview Chronic alcohol exposure enhances inhibitory and suppresses excitatory neural pathways. Abrupt cessation produces excessive central nervous system excitation, causing tremor, seizures, autonomic hyperactivity and delirium. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Severe Alcohol Withdrawal Delirium.”

126

Lithium Toxicity From Dehydration and Drug Interaction

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 64-year-old woman with bipolar disorder takes lithium. She develops diarrhea during a viral illness and begins taking ibuprofen for fever and joint pain. Her family later notices worsening tremor, slurred speech and unsteady walking. Examination and Investigations Blood pressure: 96/58 mmHg Heart rate: 58/min Coarse tremor Dysarthria Ataxia Confusion Hyperreflexia Creatinine: 196 µmol/L Sodium: 130 mmol/L Serum lithium: 2.9 mmol/L ECG: Sinus-node dysfunction

Question 1 of 1NPLEX-SYS-126

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Chronic lithium toxicity precipitated by gastroenteritis, dehydration, hyponatremia and NSAID exposure Differential Diagnosis ● Serotonin toxicity ● Neuroleptic malignant syndrome ● Cerebellar stroke Valproate toxicity Sedative toxicity Uremic encephalopathy Severe hyponatremia Infection-associated delirium Key Investigations Serial lithium concentrations Electrolytes Creatinine and eGFR ECG and cardiac monitoring Thyroid function Calcium Urinalysis Assessment of urine output Medication and supplement history Brain imaging when focal or persistent neurological findings suggest another diagnosis Conventional Treatment Stop lithium Stop interacting NSAIDs, thiazides and other contributing agents IV isotonic fluid Correct sodium carefully Monitor cardiac rhythm and neurological status Consult poison control or medical toxicology Hemodialysis for severe neurological toxicity, serious dysrhythmia, renal failure or other guideline-supported indications ● Monitor for rebound lithium concentration after dialysis Relevant Safety Issues ● Serum concentration does not perfectly correlate with clinical toxicity, especially in chronic exposure. ● Neurological findings can persist after serum levels decline. ● Lithium has a narrow therapeutic range. ● Maintain reasonably consistent dietary salt and fluid intake during long-term treatment. ● Severe diarrhea, vomiting or fever requires early medication and level review. Botanical and Supplement Safety Avoid willow bark and NSAID-like botanical combinations. Avoid strong diuretic herbs. Avoid low-sodium “detox” diets. Avoid electrolyte restriction during heavy sweating without clinical advice. Caffeine changes can alter lithium-related tremor and fluid balance. Do not use lithium-containing over-the-counter mineral products. Monitoring Neurological status Lithium concentration Kidney function Sodium Cardiac rhythm Urine output Rebound after dialysis Long-term thyroid and calcium effects Single Best Next Step Stop lithium, restore renal perfusion and obtain urgent assessment for extracorporeal removal. Clinical Pearl Treat the patient’s neurological condition, not merely the lithium number. NPLEX Examination Trap Do not give activated charcoal as the primary decontamination method for lithium. Disease Overview Lithium is a renally eliminated mood stabilizer with a narrow therapeutic index. Accumulation affects the gastrointestinal, neurological, renal and cardiac systems. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Lithium Toxicity From Dehydration and Drug Interaction.”

127

Life-Threatening Digoxin Toxicity

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

An 82-year-old man with heart failure, atrial fibrillation and chronic kidney disease takes digoxin and furosemide. He recently started clarithromycin for a respiratory infection. He presents with nausea, poor appetite, confusion and yellow-green visual disturbance. Examination and Investigations Blood pressure: 88/50 mmHg Heart rate: 38/min Irregular rhythm Potassium: 6.0 mmol/L Magnesium: Low Creatinine: Elevated Digoxin concentration: Elevated ECG: ○ High-grade AV block ○ Frequent ventricular ectopy

Question 1 of 1NPLEX-SYS-127

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Life-threatening digoxin toxicity with bradyarrhythmia, ventricular irritability and hyperkalemia Differential Diagnosis Beta-blocker toxicity Calcium-channel-blocker toxicity Hyperkalemia from kidney failure Acute coronary syndrome Sick-sinus syndrome Amiodarone toxicity Sepsis-associated conduction abnormality Hypothyroidism Key Investigations ECG and continuous monitoring Potassium Magnesium Calcium Creatinine Digoxin level drawn at an appropriate interval after the last dose Medication-interaction review Glucose Troponin where clinically indicated Conventional Treatment Stop digoxin Administer digoxin-specific immune Fab Cardiac monitoring Correct magnesium abnormalities Manage airway and circulation Atropine for selected symptomatic bradyarrhythmias while definitive treatment proceeds Temporary pacing only when necessary and with specialist input Treat ventricular arrhythmias with appropriate agents Monitor potassium after immune Fab because potassium may fall rapidly Relevant Safety Issues Digoxin level must be interpreted with symptoms, renal function and sampling time. Toxicity can occur at a level within or near the laboratory therapeutic range. Hypokalemia and hypomagnesemia increase sensitivity during chronic digoxin therapy. Acute massive poisoning may cause hyperkalemia. Serum digoxin measurements may be difficult to interpret after immune Fab administration. Botanical and Supplement Safety Avoid: Digitalis purpurea Convallaria majalis Nerium oleander Thevetia peruviana Hawthorn combinations without cardiac-drug review ● Licorice or stimulant laxatives that cause potassium loss ● Unregulated “heart tonic” products Monitoring Cardiac rhythm Potassium Magnesium Blood pressure Renal function Clinical response to immune Fab Recurrent toxicity Heart-failure worsening after reversal Single Best Next Step Administer digoxin-specific immune Fab immediately. Clinical Pearl Digoxin can cause almost any arrhythmia, but rapid atrial arrhythmias with an intact rapid ventricular response are less typical because AV-node conduction is suppressed. NPLEX Examination Trap Do not use the digoxin concentration alone to decide whether severe symptomatic toxicity is present. Disease Overview Digoxin inhibits the sodium-potassium ATPase and increases vagal activity. Toxicity produces gastrointestinal, visual, neurological, electrolyte and cardiac-conduction abnormalities. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Life-Threatening Digoxin Toxicity.”

128

Carbon Monoxide Poisoning

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

During winter, four members of one family develop headache, nausea and dizziness overnight. Their furnace was recently repaired. A 40-year-old pregnant family member briefly lost consciousness before emergency responders arrived. Examination and Investigations Blood pressure: 110/68 mmHg Heart rate: 112/min Respiratory rate: 22/min Standard pulse oximetry: 99% Confusion and impaired short-term memory No cyanosis ECG: Sinus tachycardia Carboxyhemoglobin level: Elevated

Question 1 of 1NPLEX-SYS-128

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Carbon monoxide poisoning from a malfunctioning furnace Differential Diagnosis Viral respiratory infection Food poisoning Cyanide exposure Methemoglobinemia Opioid toxicity Alcohol intoxication Migraine Intracranial hemorrhage Sepsis Key Investigations Co-oximetry carboxyhemoglobin level Blood gas Lactate Glucose ECG Troponin Neurological and cognitive assessment Pregnancy and fetal assessment Chest imaging when respiratory injury is present Evaluation of all exposed individuals Conventional Treatment Remove everyone from the source 100% oxygen Airway and cardiovascular support Treat seizures and arrhythmias Hyperbaric-oxygen consultation for severe cases Observation until symptoms and clinical risk permit discharge Fire department or qualified environmental inspection before re-entry into the building Follow-up for delayed neurological symptoms Relevant Safety Issues ● Carboxyhemoglobin levels fall after removal from exposure and oxygen administration; a modest delayed level does not exclude severe poisoning. ● Treatment decisions should consider symptoms and exposure history. ● Do not send patients back into an untested environment. ● Delayed cognitive, mood or movement symptoms may develop after apparent recovery. ● Pregnant patients require a lower threshold for aggressive assessment. Botanical and Supplement Safety No supplement detoxifies carbon monoxide. Do not use antioxidant therapy instead of oxygen. Avoid sedatives that obscure neurological monitoring. Do not treat associated headache with remedies that delay evacuation and testing. Herbal smoke and charcoal burning can themselves generate carbon monoxide in poorly ventilated spaces. Monitoring Mental status Cardiac rhythm Troponin Lactate and acid-base status Carboxyhemoglobin trend Fetal well-being ● Delayed neuropsychiatric effects ● Environmental source correction Single Best Next Step Provide 100% oxygen immediately and seek specialist assessment for hyperbaric treatment. Clinical Pearl A normal pulse-oximeter reading does not exclude carbon monoxide poisoning. NPLEX Examination Trap Do not diagnose a shared “flu-like illness” without considering a common environmental exposure. Disease Overview Carbon monoxide binds hemoglobin with high affinity and impairs oxygen delivery. It also disrupts cellular respiration and causes neurological and cardiac injury. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Carbon Monoxide Poisoning.”

129

Organophosphate Pesticide Poisoning

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 44-year-old agricultural worker is brought to the emergency department after being found collapsed beside an open pesticide container. His clothing is wet and smells strongly of chemicals. Examination ● Blood pressure: 82/46 mmHg ● Heart rate: 44/min ● Respiratory rate: 30/min with shallow breaths Oxygen saturation: 84% Pinpoint pupils Profuse salivation Lacrimation Vomiting and diarrhea Urinary incontinence Diffuse wheezing Copious bronchial secretions Muscle fasciculations and weakness Confusion

Question 1 of 1NPLEX-SYS-129

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe organophosphate pesticide poisoning with cholinergic respiratory failure Differential Diagnosis Carbamate poisoning Opioid overdose Nicotine toxicity Muscarine-containing mushroom poisoning Nerve-agent exposure Pontine hemorrhage Clonidine toxicity Severe asthma with unrelated bradycardia Gastroenteritis Key Investigations Treatment takes priority: ● Continuous ECG ● Pulse oximetry and capnography Blood gas Electrolytes Glucose Creatinine and liver function Chest imaging Plasma or red-cell cholinesterase activity Identification of the pesticide container Assessment for aspiration and pulmonary edema Conventional Treatment Personal protective equipment Removal and isolation of contaminated clothing Thorough skin irrigation Airway suction and oxygen Early intubation when necessary Repeated atropine until bronchial secretions and ventilation improve Pralidoxime for significant organophosphate toxicity Benzodiazepine for seizures Continuous monitoring for intermediate syndrome and delayed neuropathy Poison-control or medical-toxicology consultation Relevant Safety Issues Suction and ventilation equipment must be immediately available. Large cumulative atropine doses may be required. Heart rate and pupil size are unreliable atropine endpoints. Succinylcholine paralysis may be prolonged because cholinesterase activity is inhibited. Contaminated vomitus, clothing and skin can expose healthcare personnel. Botanical and Supplement Safety Do not administer oral herbal remedies. Avoid inducing vomiting. Avoid oils or solvents that increase dermal absorption. Do not use atropine-containing botanicals as unstandardized antidotes. Activated charcoal may be considered only in selected protected-airway ingestions under toxicology guidance. Monitoring ● Bronchial secretions Oxygenation and ventilation Muscle strength Heart rate and rhythm Atropine requirement Seizures Aspiration Intermediate neuromuscular weakness Delayed peripheral neuropathy Single Best Next Step Protect responders, decontaminate the patient and administer atropine while securing ventilation. Clinical Pearl The atropine target is a drying chest with improved ventilation—not dilated pupils or a specific heart rate. NPLEX Examination Trap Do not confuse vomiting, diarrhea and abdominal cramps with uncomplicated gastroenteritis when miosis, secretions and fasciculations are present. Disease Overview Organophosphates inhibit acetylcholinesterase, causing accumulation of acetylcholine at muscarinic, nicotinic and central nervous system synapses. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Organophosphate Pesticide Poisoning.”

130

Severe Salicylate Toxicity

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 59-year-old man with chronic back pain presents with vomiting, tinnitus, confusion and rapid breathing. His family finds several empty aspirin bottles. Examination and Investigations Temperature: 38.7°C Blood pressure: 98/58 mmHg Heart rate: 122/min Respiratory rate: 38/min Deep rapid breathing Diaphoresis Confusion Pulmonary crackles Glucose: 4.2 mmol/L Potassium: 3.1 mmol/L Creatinine: Elevated Blood gas: ○ pH: 7.46 ○ Low PCO₂ ○ Low bicarbonate ● Anion gap: Elevated ● Salicylate level: Markedly elevated

Question 1 of 1NPLEX-SYS-130

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe acute salicylate poisoning with neurotoxicity, pulmonary edema and kidney injury Differential Diagnosis Sepsis Diabetic ketoacidosis Alcoholic ketoacidosis Toxic alcohol ingestion Carbon monoxide poisoning Theophylline toxicity Iron poisoning ● Severe hepatic failure ● Meningitis Key Investigations Serial salicylate concentrations Frequent blood gases Electrolytes Glucose Creatinine Serum osmolality Acetaminophen concentration ECG Chest radiograph Lactate Urinalysis and urine pH Toxic-alcohol testing when indicated Conventional Treatment Activated charcoal in selected recent or ongoing absorption when the airway is protected IV sodium bicarbonate with dextrose and potassium as appropriate Frequent serum and urine pH monitoring Correction of potassium and glucose External cooling Avoidance of excessive chloride-rich acidifying fluids Emergency hemodialysis for severe clinical toxicity Intensive monitoring of respiratory and neurological status Relevant Safety Issues A near-normal or alkalemic arterial pH does not indicate mild poisoning. Brain glucose may be inadequate despite a normal serum glucose. Clinical deterioration is more important than one isolated salicylate concentration. Urine alkalinization cannot be achieved reliably when potassium remains low. Intubation can be dangerous if minute ventilation falls. Botanical and Supplement Safety Potential salicylate sources include: ● Willow bark Wintergreen oil Bismuth subsalicylate Multi-ingredient pain products Topical methyl-salicylate preparations A small volume of concentrated wintergreen oil can contain a dangerous salicylate dose, especially for a child. Monitoring Mental status Respiratory rate Blood pH Urine pH Salicylate concentration Potassium Glucose Kidney function Pulmonary edema Hemodialysis response Single Best Next Step Begin alkalinization immediately and arrange urgent hemodialysis for this severe clinical presentation. Clinical Pearl Salicylate toxicity classically produces respiratory alkalosis together with an anion-gap metabolic acidosis. NPLEX Examination Trap Do not be reassured by an alkalemic pH or delay dialysis solely because the serum concentration is below an arbitrary threshold. Disease Overview Salicylates stimulate the respiratory centre, uncouple oxidative phosphorylation and disrupt carbohydrate and lipid metabolism. Severe poisoning causes hyperthermia, acidosis, pulmonary edema, cerebral toxicity and multiorgan failure. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Severe Salicylate Toxicity.”

131

Acute Acetaminophen Overdose

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 24-year-old woman presents six hours after intentionally swallowing approximately forty 500-mg acetaminophen tablets. She initially felt well but has developed nausea and right-upper-quadrant discomfort. Examination and Investigations Blood pressure: 112/70 mmHg Heart rate: 102/min Respiratory rate: 18/min Mental status: Alert Mild epigastric and right-upper-quadrant tenderness Acetaminophen concentration at six hours: Above the treatment line AST and ALT: Initially normal INR: Normal Creatinine: Normal Pregnancy test: Negative

Question 1 of 1NPLEX-SYS-131

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Potentially hepatotoxic acute acetaminophen overdose Differential Diagnosis Salicylate poisoning Viral hepatitis Acute alcohol-related illness Ischemic hepatitis Toxic mushroom ingestion Autoimmune hepatitis Acute biliary disease Other mixed-drug overdose Key Investigations ● Timed acetaminophen concentration ● AST and ALT ● INR Bilirubin Creatinine Electrolytes Glucose Blood gas and lactate in severe illness Pregnancy testing Salicylate and other co-ingestant testing Repeated acetaminophen level when timing or formulation creates uncertainty Gold-Standard Diagnostic Approach For a single acute ingestion with a reliable time, a serum acetaminophen level obtained at least four hours after ingestion is interpreted using the standard treatment nomogram. The nomogram should not be used without adjustment for: Unknown ingestion time Repeated supratherapeutic ingestion Presentations more than 24 hours later Established hepatic injury Some modified-release or delayed-absorption circumstances Conventional Treatment ● Start oral or IV N-acetylcysteine. ● Obtain toxicology or poison-centre guidance. ● Administer activated charcoal in selected early or potentially delayed-absorption ingestions when the airway is protected. ● Monitor acetaminophen concentration, AST, ALT, INR, creatinine and clinical status. ● Continue N-acetylcysteine beyond a standard-duration protocol when acetaminophen remains detectable or liver injury, impaired synthetic function or poor prognostic markers persist. ● Refer early to a transplant-capable centre for acute liver failure. Relevant Safety Issues ● Acetaminophen is present in many cold, flu, sleep and combination opioid products. ● Severe toxicity may occur after repeated excessive dosing without one dramatic overdose. ● Chronic alcohol use does not justify withholding N-acetylcysteine. ● Vomiting during oral therapy may require repeat dosing or conversion to IV treatment. ● N-acetylcysteine infusion reactions are managed clinically and do not automatically mean the antidote must be permanently discontinued. Botanical and Supplement Safety Avoid alcohol and hepatotoxic supplements. Avoid kava, comfrey, chaparral and concentrated green-tea extract. Review all combination pain and cold products for hidden acetaminophen. Do not use milk thistle or antioxidants as substitutes for N-acetylcysteine. Stop nonessential supplements during evolving hepatic injury. Monitoring Mental status AST and ALT INR Glucose Creatinine Lactate Acetaminophen concentration Hypoglycemia Encephalopathy Signs of acute liver failure Single Best Next Step Begin N-acetylcysteine immediately. Clinical Pearl Normal initial liver enzymes do not rule out a dangerous acetaminophen overdose. NPLEX Examination Trap Do not wait for symptoms or hepatic injury before starting antidotal treatment when the timed level indicates toxicity. Disease Overview Acetaminophen is normally metabolized mainly through nontoxic pathways. In overdose, glutathione becomes depleted and the reactive metabolite NAPQI binds hepatocytes, causing centrilobular hepatic necrosis. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Acetaminophen Overdose.”

132

Tricyclic Antidepressant Overdose

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 38-year-old man is brought to the emergency department after being found beside an empty amitriptyline bottle. He is confused and has had a generalized seizure. Examination and Investigations Blood pressure: 78/44 mmHg Heart rate: 136/min Temperature: 38.1°C Dilated pupils Dry skin and mucous membranes Urinary retention Reduced bowel sounds ECG: ○ QRS duration: 146 milliseconds ○ Terminal R wave in aVR ○ Ventricular ectopy ● Blood gas: Metabolic acidosis

Question 1 of 1NPLEX-SYS-132

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe amitriptyline poisoning with sodium-channel blockade Differential Diagnosis Diphenhydramine toxicity Cocaine toxicity Carbamazepine overdose Flecainide poisoning Antipsychotic overdose Serotonin toxicity Anticholinergic poisoning Severe hyperkalemia Key Investigations Serial ECGs Continuous cardiac monitoring Electrolytes Blood gas Glucose Creatinine Acetaminophen and salicylate concentrations Pregnancy testing when relevant Toxicology testing as an adjunct Core temperature Conventional Treatment ● Airway and ventilatory support ● IV sodium bicarbonate for QRS widening, ventricular dysrhythmia, hypotension or significant acidosis ● Repeated bicarbonate boluses followed by infusion when indicated ● Benzodiazepines for seizures ● IV crystalloid ● Norepinephrine for persistent hypotension ● Activated charcoal in selected early presentations with a protected airway ● Intensive-care monitoring ● Lipid-emulsion therapy or extracorporeal support in selected refractory cases under toxicology guidance Relevant Safety Issues Avoid class IA and class IC antiarrhythmics. Avoid physostigmine. Acidemia worsens sodium-channel blockade. Intubation and hypoventilation may worsen acidosis if ventilation is inadequate. A patient who initially appears stable may deteriorate rapidly. Botanical and Supplement Safety ● Avoid sedating botanicals after overdose. ● Do not use activated charcoal unless airway safety is assured. ● Avoid St. John’s wort in patients taking antidepressants because of interaction and toxicity risks. ● Do not treat anticholinergic findings with unstandardized cholinergic herbs. ● Stop all nonessential psychoactive supplements. Monitoring QRS duration Cardiac rhythm Blood pressure Blood pH Seizures Temperature Mental status Aspiration Recurrent conduction abnormalities Single Best Next Step Administer IV sodium bicarbonate immediately. Clinical Pearl QRS widening is a central marker of severe TCA cardiotoxicity. NPLEX Examination Trap Do not wait for a tricyclic-drug concentration before treating ECG toxicity. Disease Overview Tricyclic antidepressants cause sodium-channel blockade, antimuscarinic effects, alpha-adrenergic blockade and central nervous system toxicity. Severe poisoning causes seizures, hypotension and lethal ventricular dysrhythmias. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Tricyclic Antidepressant Overdose.”

133

Propranolol Overdose

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 29-year-old woman is brought to hospital after intentionally ingesting a large quantity of propranolol. She becomes progressively drowsy and hypotensive. Examination and Investigations Blood pressure: 68/38 mmHg Heart rate: 34/min Respiratory rate: 10/min Glucose: 2.8 mmol/L Cool extremities Reduced consciousness ECG: ○ Sinus bradycardia ○ Prolonged PR interval ○ Widened QRS complex ● Brief generalized seizure occurs in the emergency department

Question 1 of 1NPLEX-SYS-133

What is the single best next step after airway stabilization?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe propranolol overdose with cardiogenic shock, hypoglycemia and seizures Differential Diagnosis Calcium-channel-blocker overdose Digoxin toxicity Clonidine poisoning Tricyclic-antidepressant toxicity Hyperkalemia Inferior myocardial infarction Organophosphate poisoning Severe hypothermia Key Investigations Continuous ECG Glucose Potassium Magnesium Calcium Creatinine Blood gas and lactate Echocardiography Acetaminophen and salicylate levels Pregnancy testing Toxicology consultation Conventional Treatment Airway and ventilation support IV crystalloid with careful reassessment Atropine as an initial temporizing intervention Glucagon in selected cases Early high-dose insulin with concentrated glucose Frequent glucose and potassium monitoring Vasopressor and inotropic support Sodium bicarbonate for significant propranolol-associated QRS widening Benzodiazepines for seizures Lipid-emulsion therapy in selected refractory lipophilic drug poisoning Mechanical circulatory support for refractory shock Relevant Safety Issues High-dose insulin requires intensive glucose and potassium monitoring. Propranolol is lipophilic and can produce seizures and coma. Glucagon frequently causes vomiting; airway protection matters. Bradycardia severity alone does not fully describe tissue perfusion. Standard insulin doses used for diabetes are insufficient for toxic cardiogenic shock. Botanical and Supplement Safety Avoid hawthorn and other products that may alter cardiac conduction or blood pressure. Do not use caffeine or stimulants to counteract bradycardia. Avoid oral products during reduced consciousness. Do not use electrolyte supplements without monitored laboratory testing. Review all cardiovascular supplements after recovery. Monitoring Heart rate and rhythm Blood pressure Cardiac output Glucose Potassium Lactate Seizures Mental status Pulmonary edema Response to insulin and vasopressors Single Best Next Step Begin high-dose insulin with glucose support and intensive hemodynamic monitoring. Clinical Pearl Beta-blocker overdose may produce hypoglycemia, while calcium-channel-blocker overdose more often produces hyperglycemia. NPLEX Examination Trap Do not stop treatment because atropine transiently raises the heart rate while shock persists. Disease Overview Beta-blocker overdose reduces heart rate, conduction and contractility. Membrane-stabilizing and central nervous system effects make propranolol particularly dangerous. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Propranolol Overdose.”

134

Verapamil Overdose

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 67-year-old man with hypertension is found confused beside an empty bottle of sustained-release verapamil. Examination and Investigations Blood pressure: 62/36 mmHg Heart rate: 38/min Respiratory rate: 18/min Cool mottled skin Glucose: 18.4 mmol/L Lactate: 7.0 mmol/L Calcium: Low-normal ECG: ○ Junctional bradycardia ○ Prolonged PR interval ● Bedside echocardiography: Severe myocardial depression

Question 1 of 1NPLEX-SYS-134

What is the single best next step after initial airway and circulation support?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe sustained-release verapamil poisoning with cardiogenic shock Differential Diagnosis Beta-blocker toxicity Digoxin toxicity Hyperkalemia Clonidine overdose Inferior myocardial infarction Septic shock Tricyclic-antidepressant overdose Adrenal crisis Key Investigations Continuous ECG Serial glucose Potassium Ionized calcium Magnesium Creatinine Blood gas and lactate Bedside echocardiography Acetaminophen and salicylate testing Abdominal imaging in selected massive sustained-release ingestion Toxicology consultation Conventional Treatment Airway and ventilation support IV crystalloid with careful reassessment IV calcium chloride or calcium gluconate Early high-dose insulin and glucose Frequent glucose and potassium monitoring Norepinephrine and epinephrine according to shock physiology Atropine as a limited temporizing measure Activated charcoal or whole-bowel irrigation in carefully selected sustained-release ingestion with airway protection ● Lipid-emulsion therapy in selected refractory cases ● Extracorporeal life support for refractory cardiogenic shock Relevant Safety Issues Hyperglycemia often reflects severe calcium-channel-blocker toxicity. High-dose insulin can cause hypoglycemia and hypokalemia. Sustained-release preparations may cause delayed or recurrent deterioration. Large fluid volumes may worsen pulmonary edema in myocardial failure. Total serum calcium may not reflect ionized calcium during critical illness. Botanical and Supplement Safety ● Avoid hawthorn, magnesium and other products that may worsen conduction or hypotension. ● Do not use oral calcium supplements as emergency treatment. ● Avoid grapefruit products during chronic verapamil therapy because they may alter drug exposure. ● Avoid stimulants to self-treat bradycardia. ● Stop nonessential cardiovascular supplements after overdose. Monitoring Blood pressure and perfusion Cardiac rhythm Echocardiographic function Glucose Potassium Ionized calcium Lactate Pulmonary edema Recurrent toxicity Single Best Next Step Initiate high-dose insulin therapy with glucose while providing IV calcium and vasopressor-supported resuscitation. Clinical Pearl Hyperglycemia in a bradycardic poisoned patient strongly supports calcium-channel-blocker toxicity. NPLEX Examination Trap Do not treat the elevated glucose as ordinary diabetes before recognizing it as a marker of severe CCB poisoning. Disease Overview Calcium-channel blockers impair vascular tone, cardiac conduction, myocardial contractility and pancreatic insulin release. Nondihydropyridines such as verapamil are particularly cardiotoxic. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Verapamil Overdose.”

135

Methanol Poisoning With Visual Toxicity

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 46-year-old man drinks an unlabelled alcohol-based solvent while attempting to substitute it for beverage alcohol. Twelve hours later, he develops abdominal pain, blurred vision and progressive confusion. Examination and Investigations Blood pressure: 94/58 mmHg Heart rate: 116/min Respiratory rate: 32/min Visual complaint: “Looking through a snowstorm” Pupils: Dilated with reduced response pH: 7.08 Bicarbonate: 7 mmol/L Anion gap: Markedly elevated Osmolal gap: Elevated Lactate: Mildly elevated Creatinine: Normal Methanol concentration: Pending

Question 1 of 1NPLEX-SYS-135

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Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe methanol poisoning with formate-induced optic and metabolic toxicity Differential Diagnosis ● Ethylene-glycol poisoning Isopropanol poisoning Diabetic ketoacidosis Alcoholic ketoacidosis Lactic acidosis Salicylate poisoning Carbon monoxide poisoning Cyanide poisoning Severe renal failure Key Investigations Methanol and ethanol concentrations Serial blood gases Electrolytes Anion gap Measured osmolality and osmolal gap Glucose Lactate Creatinine ECG Ophthalmological examination Toxicology and nephrology consultation Conventional Treatment Airway and circulatory support Fomepizole IV sodium bicarbonate Folinic acid or folate as an adjunct to formate metabolism Urgent hemodialysis for severe acidosis, visual findings, neurological toxicity, renal impairment or high toxin burden ● Serial acid-base and methanol monitoring ● Continued antidote dosing during dialysis according to protocol Relevant Safety Issues ● The osmolal gap may decline as the anion gap rises because parent methanol is metabolized. ● A normal osmolal gap late in presentation does not exclude poisoning. ● Ethanol co-ingestion may delay symptoms by slowing methanol metabolism. ● Visual symptoms may persist despite normalization of the serum methanol level. ● Do not delay dialysis in a clinically deteriorating patient. Botanical and Supplement Safety No botanical therapy neutralizes methanol or formate. Do not induce vomiting. Do not administer homemade alcohol as an antidote. Avoid folate supplements as sole treatment. Ensure unlabelled solvents and contaminated alcohol products are removed from access. Monitoring Vision Mental status Blood pH Anion gap Methanol concentration Hemodynamics Electrolytes Dialysis response Delayed neurological injury Single Best Next Step Administer fomepizole immediately and begin emergency dialysis planning. Clinical Pearl Visual disturbance plus severe anion-gap acidosis is methanol poisoning until proven otherwise. NPLEX Examination Trap Do not be reassured by a falling osmolal gap; this may mean the parent alcohol has become toxic acidic metabolites. Disease Overview Methanol is metabolized through formaldehyde to formic acid. Formate impairs mitochondrial respiration and selectively injures the optic nerves and basal ganglia. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Methanol Poisoning With Visual Toxicity.”

136

Ethylene-Glycol Poisoning

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 40-year-old man is found confused beside an open container of automotive antifreeze. Several hours later, he develops tachypnea and flank discomfort. Examination and Investigations Blood pressure: 100/62 mmHg Heart rate: 118/min Respiratory rate: 30/min Mental status: Confused pH: 7.16 Bicarbonate: 10 mmol/L Anion gap: Elevated Osmolal gap: Elevated Creatinine: Increasing Calcium: Reduced Urinalysis: Calcium-oxalate crystals Ethylene-glycol concentration: Pending

Question 1 of 1NPLEX-SYS-136

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Ethylene-glycol poisoning with metabolic acidosis and evolving oxalate nephropathy Differential Diagnosis Methanol poisoning Diabetic ketoacidosis Alcoholic ketoacidosis Lactic acidosis Isopropanol ingestion Salicylate toxicity Acute renal failure Sepsis Rhabdomyolysis Key Investigations ● Ethylene-glycol and ethanol concentrations ● Serial blood gas ● Electrolytes Anion and osmolal gaps Ionized calcium Creatinine Urine microscopy ECG Lactate Renal ultrasound when clinically indicated Toxicology and nephrology consultation Conventional Treatment Airway, breathing and circulation support Fomepizole IV sodium bicarbonate for significant acidosis Thiamine and pyridoxine as metabolic cofactors Hemodialysis for severe acidosis, kidney failure, major electrolyte disturbance or high toxin burden ● Careful management of symptomatic hypocalcemia ● Continued antidote during dialysis according to protocol ● Serial monitoring for delayed renal injury Relevant Safety Issues Calcium-oxalate crystals support but are not required for diagnosis. An osmolal gap may be normal after the parent compound has been metabolized. Severe hypocalcemia can cause tetany, seizure or QT prolongation. Ethanol co-ingestion may delay acidosis. Urine fluorescence is neither sensitive nor specific enough to rule poisoning in or out. Botanical and Supplement Safety Do not use alcohol, herbal diuretics or activated charcoal as unsupervised treatment. Avoid calcium supplementation unless medically indicated. Do not induce vomiting. Stop nephrotoxic supplements. Antifreeze should be stored securely in its original labelled container. Monitoring ● Blood pH ● Anion gap ● Calcium Creatinine Urine output Cardiac rhythm Neurological status Ethylene-glycol concentration Dialysis response Single Best Next Step Administer fomepizole before confirmatory results return and arrange dialysis for severe toxicity. Clinical Pearl Hypocalcemia and calcium-oxalate crystalluria point toward ethylene glycol rather than methanol. NPLEX Examination Trap Do not exclude ethylene-glycol poisoning when crystals are absent. Disease Overview Ethylene glycol is metabolized to glycolic and oxalic acids. Glycolate causes severe acidosis, while calcium oxalate deposits contribute to hypocalcemia and acute kidney injury. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Ethylene-Glycol Poisoning.”

137

Cyanide Poisoning From Enclosed-Space Fire

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 36-year-old woman is rescued unconscious from an enclosed apartment fire. She has facial soot and severe hemodynamic instability. Examination and Investigations ● Blood pressure: 70/38 mmHg Heart rate: 138/min Respiratory rate: 32/min Oxygen saturation: 92% with high-flow oxygen Altered consciousness Soot around the mouth and nose Carbonaceous sputum Severe lactic acidosis Lactate: 14 mmol/L Carboxyhemoglobin: Elevated Cyanide concentration: Not rapidly available

Question 1 of 1NPLEX-SYS-137

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Cyanide poisoning with concurrent smoke inhalation and carbon-monoxide exposure Differential Diagnosis Carbon monoxide poisoning alone Thermal-airway injury Methemoglobinemia Severe inhalational lung injury Traumatic brain injury Opioid or sedative poisoning Hypovolemic shock Sepsis Cardiac arrest from hypoxia Key Investigations Treatment should not wait: Serial lactate Blood gas Co-oximetry Carboxyhemoglobin Electrolytes Glucose ECG and troponin Chest imaging Bronchoscopy for selected airway injury Cyanide concentration when available Trauma assessment Conventional Treatment Remove the patient from exposure. Administer 100% oxygen. Secure the airway early when edema or soot suggests inhalational injury. Give IV hydroxocobalamin. Provide IV fluid and vasopressor support. Treat carbon-monoxide poisoning concurrently. Correct severe metabolic abnormalities. Provide intensive-care and burn-centre management. Relevant Safety Issues Hydroxocobalamin can cause red discoloration of skin, urine and body fluids. It may interfere with some laboratory assays and dialysis-machine optical sensors. Absence of an almond odour does not exclude cyanide exposure. Pulse oximetry does not reliably assess carbon-monoxide poisoning. Smoke-inhalation victims often have more than one toxin or injury. Botanical and Supplement Safety No supplement reverses cyanide toxicity. Do not use oral cyanocobalamin tablets as a substitute for IV hydroxocobalamin. Avoid inducing vomiting. Do not delay antidote administration for decontamination of an inhalational exposure. Properly process cyanogenic foods such as cassava before consumption. Monitoring Blood pressure Lactate Mental status Cardiac rhythm Oxygenation and ventilation Airway edema Renal function Concurrent carbon-monoxide toxicity Response to antidote Single Best Next Step Give hydroxocobalamin immediately while securing the airway and treating smoke inhalation. Clinical Pearl Severe unexplained lactic acidosis after an enclosed-space fire is a major clue to cyanide toxicity. NPLEX Examination Trap Do not wait for a cyanide concentration, and avoid creating additional methemoglobinemia in a patient with possible carbon-monoxide poisoning. Disease Overview Cyanide binds mitochondrial cytochrome oxidase and prevents cells from using available oxygen. The result is rapid cellular hypoxia, severe lactic acidosis, neurological failure and cardiovascular collapse. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Cyanide Poisoning From Enclosed-Space Fire.”

138

Dapsone-Induced Methemoglobinemia

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 32-year-old man begins dapsone for a dermatologic disorder. Two days later, he develops headache, fatigue and progressive blue-grey discoloration of his lips. Examination and Investigations Blood pressure: 124/76 mmHg Heart rate: 116/min Respiratory rate: 24/min Pulse oximetry: 85% despite high-flow oxygen Arterial blood gas calculated oxygen tension: High Blood appears chocolate brown Co-oximetry: Methemoglobin 31% No major pulmonary findings ● G6PD status: Unknown

Question 1 of 1NPLEX-SYS-138

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Dapsone-induced acquired methemoglobinemia Differential Diagnosis Sulfhemoglobinemia Cyanide poisoning Carbon monoxide poisoning Severe pulmonary embolism Congenital methemoglobinemia Right-to-left cardiac shunt Severe pneumonia Peripheral cyanosis from shock Key Investigations Co-oximetry Blood gas CBC Hemolysis testing G6PD assessment Electrolytes Creatinine and liver function ECG Full medication and chemical exposure history Serial methemoglobin levels Conventional Treatment Stop the oxidizing agent. Administer supplemental oxygen. Give IV methylene blue for clinically important symptomatic toxicity when appropriate. Reassess symptoms and methemoglobin concentration. Consider repeated or prolonged monitoring with dapsone because rebound may occur. Use exchange transfusion, hyperbaric oxygen or other specialist treatment in severe refractory cases. ● Consider alternatives to methylene blue in patients with substantial G6PD deficiency or other contraindications. Relevant Safety Issues ● Methylene blue may cause hemolysis or fail to work adequately in G6PD deficiency. ● Methylene blue also has monoamine-oxidase-inhibiting activity and may contribute to serotonin toxicity in patients taking serotonergic medication. ● Excessive dosing can paradoxically worsen methemoglobinemia. ● Pulse oximetry commonly remains near the mid-80% range. ● Dapsone has a long half-life and can cause recurrent methemoglobinemia. Botanical and Supplement Safety Avoid unregulated topical anesthetics and nitrate-containing products. Do not use methylene-blue supplements obtained outside medical supervision. Review benzocaine, prilocaine, nitrates and aniline exposures. Avoid oxidant botanicals or chemicals when a congenital reduction disorder is suspected. ● Do not give vitamin C alone as emergency treatment for severe symptomatic acquired disease. Monitoring Mental status Cyanosis Methemoglobin level Oxygen-saturation gap Hemolysis CBC G6PD-related complications Rebound after treatment Serotonergic adverse effects Single Best Next Step Stop dapsone and administer medically supervised methylene blue unless a contraindication requires an alternative. Clinical Pearl Low pulse oximetry with a normal or high arterial oxygen tension suggests dyshemoglobinemia. NPLEX Examination Trap Do not escalate ventilatory treatment indefinitely without obtaining co-oximetry when the cyanosis does not respond as expected. Disease Overview Methemoglobin contains oxidized ferric iron that cannot bind oxygen effectively and also impairs oxygen release from unaffected hemoglobin. Oxidizing medications can overwhelm normal reduction pathways. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Dapsone-Induced Methemoglobinemia.”

139

Tumour Lysis Syndrome

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 58-year-old man with bulky, rapidly proliferating lymphoma begins highly effective chemotherapy. Twenty-four hours later, he develops nausea, weakness, muscle cramps and reduced urine output. Examination and Investigations Blood pressure: 106/64 mmHg Heart rate: 112/min Potassium: 6.4 mmol/L Phosphate: Markedly elevated Corrected calcium: Low Uric acid: Markedly elevated Creatinine: Increased from baseline LDH: Very high ECG: Peaked T waves Urine output: Declining

Question 1 of 1NPLEX-SYS-139

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Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Clinical tumour lysis syndrome after chemotherapy Differential Diagnosis Acute kidney injury from sepsis Rhabdomyolysis Medication-induced hyperkalemia Acute uric-acid nephropathy from another cause Adrenal insufficiency Hemolysis Severe metabolic acidosis Spontaneous tumour lysis syndrome Key Investigations Continuous ECG Potassium Phosphate Calcium Uric acid Creatinine and urine output LDH Blood gas Glucose Magnesium CBC Fluid balance G6PD status when rasburicase use is anticipated and testing will not dangerously delay treatment Conventional Treatment Immediate hyperkalemia treatment Cardiac monitoring IV isotonic hydration individualized to cardiac and renal status Rasburicase for high-risk or established hyperuricemic TLS Phosphate management Avoidance of routine calcium for asymptomatic hypocalcemia unless needed for cardiac stabilization ● Nephrology consultation ● Dialysis for refractory hyperkalemia, severe hyperphosphatemia, volume overload, symptomatic hypocalcemia or worsening kidney failure ● Frequent laboratory reassessment Prevention in high-risk patients includes risk stratification, hydration, close laboratory monitoring and appropriate uric-acid-lowering prophylaxis before cytoreductive therapy. Relevant Safety Issues ● Rasburicase can cause severe hemolysis and methemoglobinemia in G6PD deficiency. ● Uric-acid blood samples after rasburicase require proper chilled handling to avoid falsely low laboratory results. ● Allopurinol does not remove existing uric acid. ● Excessive calcium administration can promote calcium-phosphate deposition. ● TLS may occur spontaneously before cancer treatment. Botanical and Supplement Safety Avoid potassium, phosphate and calcium supplements. Avoid nephrotoxic botanicals. Avoid dehydration and fasting during cytoreductive treatment. Do not use gout supplements as substitutes for rasburicase. Review vitamin C and oxidant supplements when G6PD deficiency is present. Monitoring Cardiac rhythm Potassium Phosphate Calcium Uric acid Creatinine Urine output Fluid overload Seizures Need for dialysis Single Best Next Step Treat the hyperkalemic emergency and initiate monitored hydration and rasburicase-based TLS management. Clinical Pearl Allopurinol prevents new uric-acid formation; rasburicase rapidly degrades uric acid already present. NPLEX Examination Trap Do not routinely correct asymptomatic TLS-associated hypocalcemia before controlling phosphate unless a cardiac or neuromuscular emergency requires calcium. Disease Overview Tumour lysis syndrome occurs when rapid malignant-cell destruction releases intracellular potassium, phosphate and nucleic acids. Uric acid and calcium-phosphate deposition can cause acute kidney injury, arrhythmia, seizure and death. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Tumour Lysis Syndrome.”

140

Malignant Hyperthermia During General Anesthesia

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 19-year-old man undergoes emergency surgery under general anesthesia with a volatile anesthetic and succinylcholine. Thirty minutes after induction, the anesthesiologist notices rapidly increasing end-tidal carbon dioxide despite increased ventilation. Examination and Investigations Heart rate: 148/min Temperature: Rising rapidly, currently 39.4°C Generalized muscle rigidity Masseter rigidity End-tidal carbon dioxide: Markedly elevated Mixed respiratory and metabolic acidosis Potassium: 6.2 mmol/L Creatine kinase: Increasing Dark urine develops Cardiac ectopy appears

Question 1 of 1NPLEX-SYS-140

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Malignant hyperthermia triggered by volatile anesthesia and succinylcholine Differential Diagnosis Inadequate anesthesia with sympathetic activation Sepsis Thyroid storm Neuroleptic malignant syndrome Serotonin toxicity Pheochromocytoma crisis Equipment or ventilation failure Severe transfusion reaction Heat stroke Key Investigations Treatment must not be delayed: Continuous end-tidal carbon dioxide Core temperature Blood gas Potassium Calcium Creatine kinase Renal function Coagulation studies Urinalysis for myoglobin ECG Serial laboratory monitoring after stabilization Conventional Treatment Stop volatile anesthetics and succinylcholine. Call for the malignant-hyperthermia cart and assistance. Administer IV dantrolene rapidly. Hyperventilate with 100% oxygen. Change to a nontriggering anesthetic technique if surgery must continue. Actively cool the patient when temperature is significantly elevated. Treat hyperkalemia and acidosis. Manage dysrhythmias using appropriate non-calcium-channel-blocking treatment. Maintain urine output and monitor for rhabdomyolysis. Continue post-crisis dantrolene and intensive monitoring for recurrence according to protocol. Relevant Safety Issues Increasing end-tidal carbon dioxide is often an earlier sign than extreme hyperthermia. Do not wait for fever before treating. Do not administer additional succinylcholine. Avoid calcium-channel blockers with dantrolene. Recurrence can occur after initial stabilization. Family members may also be susceptible. Botanical and Supplement Safety ● No botanical or supplement treats malignant hyperthermia. ● Avoid oral products during an anesthetic emergency. ● Ask about stimulant, recreational-drug and supplement exposure when evaluating alternative causes. ● Document the reaction prominently. ● Future procedures require a nontriggering anesthesia plan and specialist evaluation. Monitoring End-tidal carbon dioxide Core temperature Potassium Blood pH Creatine kinase Cardiac rhythm Urine output and myoglobinuria Coagulation Compartment syndrome Recurrent malignant-hyperthermia activity Single Best Next Step Discontinue all triggering anesthetics and administer IV dantrolene immediately. Clinical Pearl A rapidly rising end-tidal carbon dioxide level may be the earliest recognized sign of malignant hyperthermia. NPLEX Examination Trap Do not wait for extreme fever; hyperthermia is often a later finding. Disease Overview Malignant hyperthermia is a pharmacogenetic skeletal-muscle disorder involving uncontrolled intracellular calcium release after exposure to triggering anesthetics. The resulting hypermetabolic state causes hypercapnia, rigidity, acidosis, hyperkalemia, rhabdomyolysis and cardiovascular collapse. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Malignant Hyperthermia During General Anesthesia.”

141

Sulfonylurea-Induced Recurrent Hypoglycemia

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 78-year-old man with type 2 diabetes and chronic kidney disease is found confused and diaphoretic. His daughter reports that he may have taken his morning and evening glyburide doses together. Paramedics administer IV dextrose. He initially becomes alert, but his glucose falls again shortly after arrival. Examination and Investigations Blood pressure: 136/78 mmHg Heart rate: 104/min Respiratory rate: 18/min Diaphoretic and confused Initial glucose: 1.9 mmol/L Glucose after IV dextrose: 6.8 mmol/L Repeat glucose 45 minutes later: 2.3 mmol/L Creatinine: Elevated Liver enzymes: Normal No focal neurological deficit

Question 1 of 1NPLEX-SYS-141

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Recurrent sulfonylurea-induced hypoglycemia Differential Diagnosis Insulin overdose Sepsis Adrenal insufficiency Liver failure Insulinoma Alcohol-associated hypoglycemia Malnutrition Factitious hypoglycemia Renal-failure-associated medication accumulation Key Investigations Frequent bedside glucose Electrolytes Creatinine and eGFR Liver tests ECG Medication reconciliation Insulin and C-peptide in unexplained or factitious cases Cortisol when adrenal insufficiency is suspected Infection testing when clinically indicated Conventional Treatment Immediate oral glucose if the patient is alert and can swallow safely IV dextrose for altered consciousness or severe hypoglycemia Octreotide for recurrent or persistent sulfonylurea-related hypoglycemia Regular carbohydrate intake once swallowing is safe Continuous or frequent glucose monitoring Correction of electrolyte abnormalities Prolonged observation after the final octreotide and dextrose treatment Review and modification of the diabetes regimen Relevant Safety Issues Hypoglycemia can recur after an apparently normal glucose result. Glyburide is particularly concerning in older adults and kidney dysfunction. Neurological deficits caused by hypoglycemia can mimic stroke. Dextrose extravasation can damage tissue. Oral food or glucose should not be given when swallowing safety is impaired. Botanical and Supplement Safety ● Avoid unmonitored glucose-lowering botanicals during treatment. ● Berberine-containing products may compound glucose-lowering therapy. ● High-dose Cinnamomum products should not be added to complex diabetes regimens without review. ● Alcohol increases hypoglycemia risk. ● Clearly separate prescription medications from supplements in pill organizers. Monitoring Glucose at frequent intervals Mental status Potassium Recurrent diaphoresis, tremor or confusion Oral intake Kidney function Medication-administration safety at home Single Best Next Step Administer octreotide and continue monitored dextrose support rather than treating each recurrence with dextrose alone. Clinical Pearl Recurrent hypoglycemia after dextrose is a classic clue to sulfonylurea toxicity. NPLEX Examination Trap Do not discharge a sulfonylurea-exposed patient immediately after one normal glucose result. Disease Overview Sulfonylureas lower glucose by stimulating insulin release independently of immediate nutritional intake. Toxicity can produce prolonged, recurrent and life-threatening hypoglycemia. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Sulfonylurea-Induced Recurrent Hypoglycemia.”

142

Metformin-Associated Lactic Acidosis

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 71-year-old woman with type 2 diabetes and chronic kidney disease develops vomiting and diarrhea. She continues metformin despite poor oral intake. Two days later, she presents with profound weakness, rapid breathing and reduced consciousness. Examination and Investigations Blood pressure: 74/42 mmHg Heart rate: 122/min Respiratory rate: 34/min Temperature: 35.7°C Cool extremities Glucose: 7.4 mmol/L Creatinine: 364 µmol/L Lactate: 22 mmol/L Arterial pH: 6.91 Bicarbonate: 6 mmol/L Anion gap: Markedly elevated Ketones: Minimal No evidence of salicylate or toxic-alcohol exposure

Question 1 of 1NPLEX-SYS-142

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Metformin-associated lactic acidosis precipitated by dehydration and acute kidney injury Differential Diagnosis Septic shock Mesenteric ischemia Diabetic ketoacidosis Alcoholic ketoacidosis Cyanide poisoning Carbon monoxide poisoning Toxic-alcohol ingestion Severe hepatic failure ● Generalized seizure with lactic acidosis Key Investigations Serial blood gas Lactate Electrolytes Creatinine Glucose Ketones Liver tests CBC and cultures ECG Toxic-alcohol and salicylate testing when indicated Imaging for infection or ischemia based on the clinical context Conventional Treatment Stop metformin. Support airway and ventilation. Give carefully reassessed isotonic fluid. Begin vasopressors for persistent shock. Treat sepsis, dehydration or tissue ischemia. Correct hypoglycemia if present. Arrange emergency hemodialysis. Continue extracorporeal treatment until sustained clinical and biochemical improvement. Reassess whether metformin should be restarted after kidney recovery. Relevant Safety Issues ● Metformin does not usually cause hypoglycemia when used alone. ● A normal glucose does not exclude severe metformin toxicity. ● Sodium bicarbonate may be used selectively but does not replace definitive extracorporeal treatment. ● Lactate elevation may have multiple contributors, including shock or sepsis. ● Kidney-function decline can occur rapidly during gastrointestinal illness. Botanical and Supplement Safety ● Avoid berberine-containing products during critical illness. ● Avoid diuretic herbs during dehydration. ● Avoid alcohol because it can impair lactate metabolism. ● Stop nonessential supplements during acute kidney injury. ● Do not use “alkalizing” supplements as a substitute for emergency care. Monitoring Blood pressure Lactate Blood pH Creatinine Potassium Glucose Urine output Response to dialysis Rebound acidosis Single Best Next Step Begin resuscitation and emergency hemodialysis without waiting for a metformin level. Clinical Pearl Severe metformin-associated lactic acidosis may occur with a normal or only mildly elevated glucose. NPLEX Examination Trap Do not mistake every acidotic patient with diabetes for diabetic ketoacidosis. Disease Overview Metformin reduces hepatic glucose production and affects mitochondrial metabolism. During major accumulation and tissue hypoperfusion, severe lactic acidosis and cardiovascular collapse may occur. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Metformin-Associated Lactic Acidosis.”

143

Valproate Toxicity With Hyperammonemic Encephalopathy

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 33-year-old man with bipolar disorder is brought to hospital after ingesting an unknown quantity of extended-release divalproex. He becomes progressively somnolent despite normal oxygenation and glucose. Examination and Investigations Blood pressure: 86/50 mmHg Heart rate: 110/min Respiratory rate: 10/min Glasgow Coma Scale: 8 Pupils: Reactive Valproate concentration: Markedly elevated Ammonia: 246 µmol/L Lactate: Elevated Platelets: Reduced Sodium: Elevated Liver enzymes: Mildly elevated CT head: Early cerebral edema

Question 1 of 1NPLEX-SYS-143

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe valproate poisoning with hyperammonemic encephalopathy and cerebral edema Differential Diagnosis Hepatic encephalopathy Urea-cycle disorder Sedative overdose Salicylate poisoning Sepsis Meningitis Hypoglycemia Nonconvulsive status epilepticus Postictal state Key Investigations Serial valproate concentrations Ammonia Blood gas and lactate Electrolytes Glucose Liver tests INR CBC and platelets Lipase ECG CT head when cerebral edema is suspected Continuous EEG in unexplained persistent coma Conventional Treatment Airway and ventilation support IV fluid and vasopressors IV L-carnitine Activated charcoal in selected protected-airway cases Serial valproate and ammonia measurements Management of cerebral edema Hemodialysis or another appropriate extracorporeal modality in severe toxicity Treatment of seizures Monitoring for pancreatitis and liver failure Relevant Safety Issues ● Total valproate concentration may underestimate active unbound drug during massive overdose or low albumin. ● Hyperammonemia can occur without major liver-enzyme elevation. ● Extended-release products may cause delayed concentration peaks. ● Valproate can cause thrombocytopenia. ● Valproate is highly teratogenic and requires reproductive-safety counselling during long-term use. Botanical and Supplement Safety ● Avoid valerian and sedating supplements during CNS depression. ● Do not confuse valproate with valerian despite similar names. ● Avoid hepatotoxic botanicals. ● Stop nonessential supplements during hyperammonemia. ● Do not use carnitine supplements as a substitute for monitored IV therapy in severe poisoning. Monitoring Mental status Respiratory function Ammonia Valproate concentration Liver function and INR Platelets Sodium Cerebral edema Dialysis response Single Best Next Step Protect the airway, administer L-carnitine and activate emergency dialysis management. Clinical Pearl Valproate-induced hyperammonemic encephalopathy may occur with relatively mild liver-test abnormalities. NPLEX Examination Trap Do not be reassured by modest AST and ALT values when coma and ammonia elevation are present. Disease Overview Valproate toxicity disrupts mitochondrial metabolism, urea-cycle function and fatty-acid oxidation. Severe exposure can cause cerebral edema, cardiovascular collapse and multiorgan dysfunction. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Valproate Toxicity With Hyperammonemic Encephalopathy.”

144

Colchicine Toxicity From Clarithromycin Interaction

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 73-year-old man with chronic kidney disease takes colchicine daily for gout prophylaxis. He is prescribed clarithromycin for pneumonia. Four days later, he develops severe vomiting, watery diarrhea and abdominal pain. Over the next 24 hours, he becomes hypotensive. Examination and Investigations Blood pressure: 78/44 mmHg Heart rate: 126/min Temperature: 38.4°C Diffuse abdominal tenderness WBC: Initially elevated, then rapidly falling Platelets: Falling Creatinine: Elevated AST and ALT: Elevated Lactate: Elevated Creatine kinase: Rising ECG: Ventricular ectopy

Question 1 of 1NPLEX-SYS-144

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe colchicine toxicity caused by a colchicine–clarithromycin interaction Differential Diagnosis ● Sepsis Infectious gastroenteritis Neutropenic enterocolitis Digoxin toxicity Chemotherapy toxicity Toxic mushroom ingestion Mesenteric ischemia Hemolytic uremic syndrome Key Investigations CBC with serial differential Electrolytes Kidney and liver function Lactate and blood gas Creatine kinase Coagulation studies ECG and cardiac monitoring Blood cultures Medication-interaction review Colchicine concentration where available, without delaying care Conventional Treatment Stop colchicine and interacting medication. Admit to intensive care. Provide airway, fluid and vasopressor support. Correct electrolyte and acid-base abnormalities. Treat dysrhythmias. Monitor and treat bone-marrow failure. Provide granulocyte-colony-stimulating factor in selected severe neutropenia. Manage rhabdomyolysis and kidney injury. Obtain toxicology consultation. Relevant Safety Issues ● There is no routinely available universally effective antidote. ● Initial diarrhea may precede a deceptive interval before multiorgan failure. ● Colchicine dosing must be reduced or avoided in kidney dysfunction and major interactions. ● Myelosuppression may produce delayed sepsis and bleeding. ● Chronic therapeutic dosing can become toxic after an interacting drug is added. Botanical and Supplement Safety ● Avoid grapefruit products with drugs affected by CYP3A4. ● Avoid unregulated Colchicum autumnale preparations. ● Colchicum and autumn crocus are poisonous and must not be confused with culinary saffron. ● Stop nephrotoxic and hepatotoxic supplements. ● Do not use anti-diarrheal herbs to mask progressive toxicity. Monitoring Blood pressure Cardiac rhythm CBC Infection and bleeding Liver and kidney function Creatine kinase Lactate Respiratory status Multiorgan failure Single Best Next Step Stop the interacting drugs and initiate immediate intensive supportive management. Clinical Pearl Severe diarrhea in a patient taking colchicine may be an early toxicity warning, not merely a nuisance adverse effect. NPLEX Examination Trap Do not prescribe clarithromycin without reviewing colchicine use and renal function. Disease Overview Colchicine blocks microtubule formation and disrupts rapidly dividing cells. Overexposure damages the gastrointestinal tract, bone marrow, heart, liver, muscles and nervous system. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Colchicine Toxicity From Clarithromycin Interaction.”

145

Severe Iron Poisoning in a Child

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 3-year-old child is found beside an open bottle of prenatal vitamins. Several tablets are missing. Within two hours, the child develops repeated vomiting, abdominal pain and bloody diarrhea. Examination and Investigations Blood pressure: 72/38 mmHg Heart rate: 148/min Respiratory rate: 32/min Pale and lethargic Diffuse abdominal tenderness Blood gas: Metabolic acidosis Lactate: Elevated Glucose: Elevated Serum iron: Markedly elevated at an appropriate post-ingestion interval Abdominal radiograph: Multiple radiopaque tablets in the stomach and intestine

Question 1 of 1NPLEX-SYS-145

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe acute elemental-iron poisoning Differential Diagnosis Gastroenteritis Caustic ingestion Salicylate poisoning Acetaminophen overdose Sepsis Intussusception Toxic mushroom ingestion Lead exposure Diabetic ketoacidosis Key Investigations Serum iron at an appropriate interval after ingestion CBC Electrolytes Glucose Blood gas Lactate Liver tests INR Kidney function Abdominal radiograph for radiopaque tablets Serial clinical and laboratory reassessment Toxicology or poison-centre consultation Conventional Treatment Airway, breathing and circulation support IV isotonic fluid Vasopressors if shock persists IV deferoxamine for severe clinical toxicity Whole-bowel irrigation for significant radiopaque tablet burden when appropriate and bowel function permits ● Correction of acidosis and hypoglycemia ● Intensive monitoring for liver failure ● Early transplant-centre consultation if fulminant hepatic failure develops Relevant Safety Issues A temporary symptom-free period may occur before shock or liver failure. Serum iron concentration must be interpreted with ingestion timing and clinical findings. Sustained-release or enteric-coated tablets may delay absorption. Deferoxamine can cause hypotension if infused excessively rapidly. Activated charcoal is ineffective. Botanical and Supplement Safety Store all vitamins in child-resistant containers and out of sight. Do not describe iron tablets as candy. Multivitamins and prenatal products must be included in poisoning histories. Do not administer home chelation products. Avoid forced oral fluids in a lethargic or vomiting child. Monitoring Hemodynamics Mental status Blood gas and lactate Liver function Glucose Kidney function Gastrointestinal bleeding Radiographic tablet clearance Response to chelation Single Best Next Step Resuscitate and begin IV deferoxamine for severe symptomatic iron poisoning. Clinical Pearl Iron is a nutrient at therapeutic doses but a corrosive and cellular toxin in overdose. NPLEX Examination Trap Do not give activated charcoal for iron ingestion. Disease Overview Iron poisoning progresses through gastrointestinal injury, systemic toxicity, possible transient improvement, hepatic failure and, in survivors, potential late gastrointestinal scarring. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Severe Iron Poisoning in a Child.”

146

Caustic Alkali Ingestion

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 42-year-old man intentionally swallows a mouthful of concentrated drain cleaner containing sodium hydroxide. He immediately develops severe oral and chest pain, drooling and difficulty swallowing. Examination Blood pressure: 104/68 mmHg Heart rate: 118/min Respiratory rate: 26/min Hoarse voice Drooling Oral burns Stridor Epigastric tenderness No vomiting since arrival

Question 1 of 1NPLEX-SYS-146

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe caustic alkali ingestion with upper-airway and esophageal injury Differential Diagnosis Thermal burn Foreign-body ingestion Caustic acid ingestion Allergic angioedema Epiglottitis Esophageal perforation Acute coronary syndrome Organophosphate exposure Key Investigations Continuous airway assessment CBC Electrolytes and creatinine Blood gas and lactate Chest and abdominal radiography CT of the neck, chest and abdomen when deep injury or perforation is suspected Endoscopy after stabilization according to specialist guidance Bronchoscopy when airway injury is suspected Pregnancy testing where relevant Conventional Treatment Early airway protection Supplemental oxygen NPO status IV fluid and analgesia Poison-centre consultation Gastroenterology, ENT and surgical involvement Endoscopic assessment Antibiotics when perforation, infection or selected severe injury requires them Emergency surgery for perforation or necrosis Long-term follow-up for esophageal stricture and malignancy risk Relevant Safety Issues Severe esophageal injury can occur without dramatic oral burns. Do not induce emesis. Do not neutralize the chemical. Do not perform blind gastric instrumentation. Corticosteroids are not routinely beneficial for all caustic injuries and require specialist indication. ● Intentional ingestion also requires mental-health and suicide-risk evaluation after medical stabilization. Botanical and Supplement Safety ● Do not give milk, oils, vinegar, citrus juice or herbal demulcents without poison-centre direction. ● Avoid essential oils. ● Do not apply herbal products to oral burns. ● Do not delay airway management for soothing remedies. ● Store concentrated cleaners in original labelled containers. Monitoring Airway edema Stridor Respiratory status Chest or abdominal pain Perforation Infection Nutrition and swallowing Stricture formation Mental-health safety Single Best Next Step Protect the airway and activate urgent specialist evaluation without inducing vomiting or attempting neutralization. Clinical Pearl The absence of major oral burns does not exclude severe esophageal injury. NPLEX Examination Trap Do not attempt to neutralize an ingested alkali with an acid. Disease Overview Strong alkalis cause liquefactive necrosis that can penetrate deeply through gastrointestinal tissue. Strong acids more often produce coagulative injury, but either can cause perforation and systemic collapse. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Caustic Alkali Ingestion.”

147

Acute Hemolytic Transfusion Reaction

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 63-year-old woman receives packed red blood cells after surgery. Fifteen minutes after the transfusion begins, she develops fever, chills, severe lower-back pain and shortness of breath. Examination and Investigations Blood pressure: 74/40 mmHg Heart rate: 128/min Temperature: 39.1°C Chest and back pain Dark red-brown urine Oozing from the surgical drain The blood-unit label does not appear to match the patient’s wristband

Question 1 of 1NPLEX-SYS-147

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute intravascular hemolytic transfusion reaction from incompatible red cells Differential Diagnosis Febrile nonhemolytic transfusion reaction Bacterial contamination of the blood product Anaphylactic transfusion reaction TRALI TACO Underlying hemorrhagic shock Delayed hemolytic transfusion reaction Key Investigations Recheck patient and blood-unit identification Direct antiglobulin test Repeat ABO and compatibility testing CBC Plasma-free hemoglobin LDH Bilirubin Haptoglobin Urinalysis Creatinine Potassium Coagulation studies and fibrinogen Blood cultures and unit cultures when bacterial contamination is possible Conventional Treatment Stop the transfusion. Keep IV access with normal saline and new tubing. Notify the blood bank and treating team. Support blood pressure and oxygenation. Maintain renal perfusion. Treat hyperkalemia. Monitor and treat DIC. Provide intensive-care support when unstable. Investigate and report the transfusion error. Relevant Safety Issues ● The most severe reactions can begin after only a small volume has infused. ● Clerical and patient-identification errors are major preventable causes. ● General anesthesia may mask pain and chills; hypotension, bleeding or hemoglobinuria may be the first clues. ● Do not restart the implicated unit. ● Document all findings and actions. Botanical and Supplement Safety Herbal treatment has no role. Stop bleeding-promoting supplements during DIC. Avoid nephrotoxic products. Do not give oral products during shock. Supplements should not delay transfusion-reaction investigation. Monitoring Blood pressure Urine output Potassium Creatinine Hemolysis markers Coagulation Bleeding Respiratory status Ongoing transfusion requirements using compatible products Single Best Next Step Stop the transfusion immediately and activate the transfusion-reaction protocol. Clinical Pearl Any serious new symptom during a transfusion should prompt immediate cessation while the cause is investigated. NPLEX Examination Trap Do not treat fever during transfusion as a benign febrile reaction until hemolysis and bacterial contamination have been excluded. Disease Overview An acute hemolytic transfusion reaction occurs when recipient antibodies rapidly destroy incompatible donor red cells, triggering complement activation, shock, hemoglobinuria, kidney injury and DIC. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Hemolytic Transfusion Reaction.”

148

Transfusion-Related Acute Lung Injury

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 59-year-old woman receives plasma and platelets during surgery. Two hours later, she develops severe shortness of breath. Examination and Investigations Blood pressure: 86/52 mmHg Heart rate: 118/min Temperature: 38.2°C Oxygen saturation: 78% Diffuse bilateral crackles No jugular venous distension No peripheral edema Chest radiograph: New bilateral pulmonary infiltrates Echocardiography: Preserved left-ventricular systolic function Fluid balance: Not substantially positive BNP: Not significantly elevated

Question 1 of 1NPLEX-SYS-148

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Transfusion-related acute lung injury Differential Diagnosis ● Transfusion-associated circulatory overload ● Acute hemolytic transfusion reaction Anaphylaxis Bacterial contamination Aspiration Cardiogenic pulmonary edema Pneumonia Pulmonary embolism ARDS from another cause Key Investigations Blood gas Chest imaging ECG BNP or NT-proBNP as supportive information Echocardiography Fluid-balance assessment CBC and hemolysis tests Blood cultures when sepsis is possible Blood-bank investigation Evaluation for alternative ARDS risks Conventional Treatment Stop the transfusion. Notify the blood bank. Give supplemental oxygen. Provide lung-protective mechanical ventilation if required. Treat shock with carefully selected fluid and vasopressor support. Avoid unnecessary diuresis in a hypotensive patient without overload. Report and investigate the reaction. Avoid unnecessary future transfusions. Relevant Safety Issues ● TRALI can resemble TACO. ● TACO more often shows hypertension, volume overload, elevated natriuretic peptide and improvement with diuresis. ● TRALI may produce fever and hypotension. ● No laboratory test alone proves TRALI. ● The implicated transfusion should not be restarted. Botanical and Supplement Safety Herbal diuretics should not be used. Avoid oral supplements during respiratory failure. No antioxidant or anti-inflammatory supplement replaces ventilatory support. Review unnecessary supplements that increase bleeding and future transfusion requirements. ● Do not delay blood-bank notification. Monitoring Oxygenation Respiratory mechanics Blood pressure Chest imaging Fluid balance Cardiac function Fever Need for ventilation Resolution over subsequent days Single Best Next Step Stop the transfusion and support oxygenation and ventilation. Clinical Pearl Hypotension and absence of fluid overload favor TRALI over TACO. NPLEX Examination Trap Do not reflexively administer large doses of diuretics to every patient who develops pulmonary edema during transfusion. Disease Overview TRALI is acute noncardiogenic pulmonary edema temporally associated with transfusion. Donor antibodies or other biological mediators may activate recipient neutrophils and damage pulmonary endothelium. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Transfusion-Related Acute Lung Injury.”

149

Venomous Snakebite With Progressive Envenomation

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 36-year-old agricultural worker is bitten on the lower leg by an unidentified snake. A family member applies a tight rope above the knee and cuts the bite site. Two hours later, the patient develops progressive leg swelling, gum bleeding and drooping eyelids. Examination and Investigations Blood pressure: 88/54 mmHg Heart rate: 122/min Respiratory rate: 24/min Progressive swelling extending above the knee Local bruising and oozing Bilateral ptosis Weak neck flexion Prolonged clotting time Fibrinogen: Low Platelets: Reduced Creatinine: Rising

Question 1 of 1NPLEX-SYS-149

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Systemic venomous-snake envenomation with neurotoxicity, coagulopathy and acute kidney injury Differential Diagnosis ● Nonvenomous snakebite with panic reaction ● Severe allergic reaction Compartment syndrome Necrotizing infection Tetanus Organophosphate poisoning Disseminated intravascular coagulation from another cause Traumatic vascular injury Key Investigations Serial limb measurements CBC and platelets Coagulation studies and fibrinogen Creatinine and electrolytes Creatine kinase Urinalysis ECG Blood gas Respiratory-strength assessment Blood typing and crossmatch Species identification only when safely available through a photograph or expert—not by capturing the snake Conventional Treatment Airway and ventilatory support IV access and shock treatment Regionally appropriate antivenom Monitoring and treatment of antivenom-associated anaphylaxis Repeated laboratory assessment Blood products after adequate antivenom when major bleeding persists Dialysis for severe kidney injury Tetanus prophylaxis Surgical consultation for necrosis or true compartment syndrome Wound care Relevant Safety Issues ● Antivenom can cause anaphylaxis, but this does not justify withholding it when indicated. ● Fasciotomy should not be performed for swelling alone; true compartment syndrome must be established and coagulopathy corrected. ● Do not use ice, electric shock, cutting or suction. ● Walking increases venom distribution; transport the patient. ● Tourniquet removal should occur in a monitored setting when severe envenomation may be released systemically. Botanical and Supplement Safety Avoid herbal snake stones, poultices and oral antidotes. Do not give alcohol. Do not apply essential oils or caustic products. Avoid aspirin and bleeding-promoting supplements. Traditional treatment must not delay antivenom access. Monitoring Airway and respiratory strength Swelling progression Coagulation Bleeding Kidney function Urine output Neurological weakness Antivenom reaction Tissue necrosis Single Best Next Step Provide monitored immobilization, resuscitation and urgent antivenom without waiting for exact species identification. Clinical Pearl Clinical evidence of envenomation—not the number of fang marks—determines treatment urgency. NPLEX Examination Trap Do not cut, suck or apply a tight tourniquet to a snakebite. Disease Overview Snake venoms may contain neurotoxins, procoagulant or anticoagulant proteins, cytotoxins, myotoxins and nephrotoxins. Clinical patterns vary by species and geography. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Venomous Snakebite With Progressive Envenomation.”

150

Amatoxin Mushroom Poisoning

1 questions ·

GEA: Medical InterventionsSEA: Acute Care, Toxicology & Medication Safety

System-based clinical case

A 49-year-old woman eats wild mushrooms collected during a hike. She feels well for approximately ten hours, then develops severe vomiting, watery diarrhea and abdominal cramps. The gastrointestinal symptoms improve the following day, but she develops jaundice and confusion 48 hours after ingestion. Examination and Investigations Blood pressure: 96/58 mmHg Heart rate: 112/min Mild jaundice Right-upper-quadrant tenderness Confusion AST: 5,800 U/L ALT: 6,400 U/L INR: 4.2 Bilirubin: Elevated Glucose: 2.9 mmol/L Lactate: Elevated Creatinine: Rising

Question 1 of 1NPLEX-SYS-150

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Amatoxin mushroom poisoning with fulminant hepatic failure Differential Diagnosis ● Acetaminophen toxicity ● Viral hepatitis ● Ischemic hepatitis Autoimmune hepatitis Acute Budd–Chiari syndrome Other toxic mushroom syndrome Bacterial gastroenteritis followed by sepsis Acute fatty liver Wilson-related acute liver failure Key Investigations Serial AST and ALT INR and fibrinogen Bilirubin Glucose Creatinine Lactate Ammonia Blood gas Acetaminophen concentration Viral and autoimmune liver evaluation when appropriate Mushroom photographs or remaining specimens for expert identification Frequent prognostic assessment for liver transplantation Conventional Treatment Immediate poison-centre and medical-toxicology consultation Aggressive fluid and electrolyte replacement Repeated glucose monitoring and dextrose treatment Multidose activated charcoal when appropriate IV N-acetylcysteine IV silibinin where available under specialist protocols Management of encephalopathy, coagulopathy and kidney injury Early transfer to a liver-transplant centre Emergency transplantation when prognostic criteria indicate irreversible failure Relevant Safety Issues ● Delayed gastrointestinal symptoms after wild-mushroom ingestion are more concerning than symptoms that begin immediately. ● Apparent clinical improvement does not mean the toxin has cleared. ● Aminotransferase levels may rise rapidly after the GI phase. ● Do not delay transfer until advanced encephalopathy develops. ● Cooking, drying or freezing does not reliably destroy amatoxins. Botanical and Supplement Safety Never eat a wild mushroom based only on an app or photograph. Milk thistle supplements are not a home antidote. Avoid hepatotoxic supplements. Do not use antidiarrheal products without toxicology advice. Save mushroom remnants for identification without handling or tasting them further. Monitoring Mental status Glucose INR AST and ALT Bilirubin Lactate Creatinine Ammonia Cerebral edema Transplant eligibility and timing Single Best Next Step Begin specialist-directed toxicology care and transfer early to a transplant-capable centre. Clinical Pearl Delayed vomiting followed by a symptom-free interval and hepatic failure is the classic amatoxin pattern. NPLEX Examination Trap Do not interpret improvement of gastrointestinal symptoms as recovery. Disease Overview Amatoxins are heat-stable cyclic peptides that inhibit messenger-RNA production. The liver receives a high toxin burden through enterohepatic circulation, making fulminant hepatic failure the principal cause of death. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
American Heart Association. Current Basic and Advanced Life Support algorithms, when applicable.
Provincial poison centre, TOXBASE, or equivalent current toxicology guidance relevant to the exposure or medication emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Amatoxin Mushroom Poisoning.”

151

SGLT2-Inhibitor-Associated Euglycemic Diabetic Ketoacidosis

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 54-year-old woman with type 2 diabetes undergoes elective abdominal surgery. Her medications include metformin and dapagliflozin. She stopped eating the evening before surgery but took all her diabetes medications that morning. On postoperative day 1, she develops nausea, abdominal pain, rapid breathing and increasing fatigue. Examination and Investigations Blood pressure: 98/62 mmHg Heart rate: 116/min Respiratory rate: 30/min Oxygen saturation: 97% Dry mucous membranes Diffuse mild abdominal tenderness Glucose: 10.7 mmol/L Beta-hydroxybutyrate: Markedly elevated Arterial pH: 7.18 Bicarbonate: 11 mmol/L Anion gap: Elevated Lactate: Mildly elevated Creatinine: Increased from baseline

Question 1 of 1NPLEX-SYS-151

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Dapagliflozin-associated euglycemic diabetic ketoacidosis precipitated by surgery and fasting Differential Diagnosis ● Starvation ketoacidosis ● Alcoholic ketoacidosis Lactic acidosis Sepsis Toxic-alcohol ingestion Salicylate toxicity Acute mesenteric ischemia Conventional hyperglycemic DKA Key Investigations Bedside glucose Serum beta-hydroxybutyrate Venous or arterial blood gas Electrolytes and anion gap Potassium Creatinine Lactate CBC Urinalysis Infection evaluation ECG Pregnancy testing where relevant Urine ketone testing may underestimate early DKA because it does not directly measure beta-hydroxybutyrate. Conventional Treatment Stop the SGLT2 inhibitor. Begin IV isotonic crystalloid. Start IV insulin after potassium assessment. Add dextrose when glucose is not substantially elevated or begins falling. Replace potassium according to serial results. Identify and treat infection, infarction, surgery-related stress or insulin omission. Continue treatment until ketonemia and acidosis have resolved rather than stopping when glucose becomes normal. ● Review sick-day and perioperative medication instructions before discharge. Relevant Safety Issues ● SGLT2 inhibitors should be withheld before planned surgery or prolonged fasting according to current perioperative guidance. ● Normal glucose does not exclude DKA. ● Insulin should generally be delayed when potassium is dangerously low. ● Potassium may fall rapidly after insulin begins. ● A normalizing glucose level does not prove that ketoacidosis has resolved. Botanical and Supplement Safety Avoid ketogenic diets during SGLT2-inhibitor treatment without medical supervision. Avoid prolonged fasting and dehydration-based “detox” programs. Avoid glucose-lowering supplements during acute DKA. Berberine-containing products may complicate diabetes treatment. Do not use electrolyte powders without checking potassium and kidney function. Monitoring Glucose Beta-hydroxybutyrate Potassium Bicarbonate and pH Anion gap Creatinine Fluid balance Mental status Precipitating illness Single Best Next Step Recognize euglycemic DKA and begin full DKA therapy despite the modest glucose level. Clinical Pearl In a symptomatic patient taking an SGLT2 inhibitor, check ketones and acid-base status even when glucose is near normal. NPLEX Examination Trap Do not rule out DKA because the glucose is below the usual hyperglycemic range. Disease Overview DKA results from insufficient effective insulin and excess counter-regulatory hormones, leading to lipolysis, ketone production, metabolic acidosis, osmotic diuresis and electrolyte depletion. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “SGLT2-Inhibitor-Associated Euglycemic Diabetic Ketoacidosis.”

152

Hyperosmolar Hyperglycemic State

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

An 82-year-old woman with type 2 diabetes is brought to the hospital because of increasing confusion and weakness. She has had cough, fever and poor fluid intake for five days. Examination and Investigations Temperature: 38.5°C Blood pressure: 86/50 mmHg Heart rate: 122/min Respiratory rate: 22/min Profoundly dry mucous membranes Reduced skin turgor Confused but without focal neurological deficits Glucose: 48 mmol/L Effective serum osmolality: 342 mOsm/kg Sodium: Elevated after correction for glucose Bicarbonate: 21 mmol/L pH: 7.34 Beta-hydroxybutyrate: Mildly elevated Creatinine: Elevated Chest radiograph: Right-lower-lobe infiltrate

Question 1 of 1NPLEX-SYS-152

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Hyperosmolar hyperglycemic state precipitated by pneumonia and dehydration Differential Diagnosis DKA Mixed DKA/HHS Sepsis-associated encephalopathy Stroke Severe hypernatremia Uremic encephalopathy Medication toxicity Diabetes insipidus Nonketotic starvation dehydration Key Investigations Serial glucose Electrolytes Corrected sodium Serum osmolality Potassium Blood gas Beta-hydroxybutyrate Creatinine CBC Cultures Chest imaging ECG Urine output Neurological reassessment Conventional Treatment IV isotonic crystalloid Careful adjustment of fluid type according to sodium, osmolality and hemodynamics Potassium replacement based on serial results IV insulin after initial fluid therapy and potassium assessment Dextrose addition as glucose falls while osmolality and metabolic abnormalities continue to resolve ● Treatment of pneumonia or another precipitating illness ● Thrombosis prevention when appropriate ● Frequent neurological and laboratory monitoring HHS has substantial total-body water and electrolyte deficits, and complete correction often requires prolonged monitored treatment. Relevant Safety Issues ● Older adults may have concurrent heart or kidney disease requiring smaller reassessed fluid boluses. ● A normal measured sodium may conceal major free-water loss. ● Corrected sodium may initially rise as glucose falls without representing treatment failure. ● Potassium may be normal or elevated despite severe total-body potassium depletion. ● Mixed DKA/HHS is common and should be treated according to the ketotic and acid-base findings. Botanical and Supplement Safety Avoid diuretic teas during dehydration. Avoid high-sugar rehydration products without a structured medical plan. Do not use cinnamon, berberine or bitter melon as emergency glucose treatment. Avoid potassium-containing electrolyte mixtures until potassium and kidney function are known. ● Do not delay antibiotics or insulin for natural therapies. Monitoring Mental status Blood pressure Glucose Serum osmolality Sodium Potassium Creatinine Fluid balance Thrombosis Infection response Single Best Next Step Restore circulating volume with carefully monitored IV fluid before aggressive insulin treatment. Clinical Pearl In HHS, neurological symptoms correlate more strongly with hyperosmolality than with the glucose number alone. NPLEX Examination Trap Do not try to normalize glucose and sodium rapidly. Disease Overview HHS develops when enough insulin is present to limit major ketogenesis but not enough to control hyperglycemia. Severe osmotic diuresis produces dehydration, hyperosmolality and neurological dysfunction. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Hyperosmolar Hyperglycemic State.”

153

Thyroid Storm

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 42-year-old woman with untreated Graves disease develops fever, vomiting and agitation during a severe respiratory infection. Examination and Investigations Temperature: 40.2°C Blood pressure: 154/82 mmHg Heart rate: 178/min, irregular Respiratory rate: 30/min Severe agitation and delirium Tremor Diffuse goiter Pulmonary crackles ECG: Atrial fibrillation with rapid ventricular response Free T4 and free T3: Markedly elevated TSH: Suppressed Bilirubin and liver enzymes: Elevated

Question 1 of 1NPLEX-SYS-153

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Thyroid storm precipitated by respiratory infection Differential Diagnosis Sepsis Serotonin toxicity Neuroleptic malignant syndrome Heat stroke Pheochromocytoma crisis Severe alcohol withdrawal Anticholinergic poisoning Malignant hyperthermia Acute psychosis Key Investigations Treatment must not wait: TSH, free T4 and free T3 CBC Electrolytes Glucose Liver and kidney function Blood cultures Chest imaging ECG and cardiac monitoring Troponin Pregnancy testing Cortisol where appropriate Thyroid-receptor antibodies when the cause is uncertain Conventional Treatment ● ICU admission ● Oxygen, cooling and IV fluid individualized to cardiac status ● Short-acting beta-blockade when appropriate, with caution in severe decompensated heart failure ● Methimazole or propylthiouracil ● Iodide administered after antithyroid therapy ● Glucocorticoid ● Treatment of infection ● Management of arrhythmia and heart failure ● Cholestyramine or advanced rescue therapies in selected refractory cases ● Definitive therapy after stabilization Guidelines emphasize that thyroid storm requires treatment of thyrotoxicosis and simultaneous management of neurological, cardiovascular, gastrointestinal and hepatic complications. Relevant Safety Issues ● Propranolol or another beta-blocker can precipitate collapse in severe low-output heart failure; short-acting titratable agents may be safer. ● Aspirin can increase free thyroid-hormone concentrations and is generally avoided. ● Propylthiouracil carries hepatotoxicity risk. ● Methimazole is generally preferred outside specific circumstances. ● Monitor for agranulocytosis with antithyroid medications. Botanical and Supplement Safety Avoid iodine and kelp products. Avoid stimulant and weight-loss supplements. Avoid Commiphora mukul and unregulated “thyroid support” formulas. Do not use Lycopus virginicus or Leonurus cardiaca as substitutes for emergency therapy. ● Review biotin because it can interfere with thyroid laboratory assays. Monitoring Temperature Mental status Heart rate and rhythm Blood pressure Heart failure Liver function Glucose Electrolytes Infection response Antithyroid-drug toxicity Single Best Next Step Begin multimodal thyroid-storm treatment immediately without waiting for additional confirmation. Clinical Pearl Thyroid storm is defined by clinical decompensation, not by a particular free-T4 value. NPLEX Examination Trap Do not administer iodine before blocking new thyroid-hormone synthesis. Disease Overview Thyroid storm is an extreme form of thyrotoxicosis in which excessive thyroid-hormone effects combine with an acute precipitant to produce multiorgan dysfunction. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Thyroid Storm.”

154

Myxedema Coma

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

An 80-year-old woman is brought to the hospital during winter because of progressive lethargy and confusion. She stopped taking levothyroxine several months ago. Examination and Investigations Temperature: 32.8°C Blood pressure: 82/48 mmHg Heart rate: 42/min Respiratory rate: 8/min Oxygen saturation: 86% Puffy face and nonpitting edema Dry, coarse skin Delayed reflex relaxation Sodium: 121 mmol/L Glucose: 3.0 mmol/L Blood gas: Hypercapnia and respiratory acidosis TSH: Markedly elevated Free T4: Very low Chest radiograph: Left-lower-lobe pneumonia

Question 1 of 1NPLEX-SYS-154

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Myxedema coma precipitated by pneumonia and levothyroxine nonadherence Differential Diagnosis Sepsis Adrenal crisis Hypothermia Sedative overdose Stroke Hypercapnic respiratory failure Severe hyponatremia Hypoglycemia Uremic encephalopathy Key Investigations TSH and free T4 Cortisol before glucocorticoid when this does not delay treatment CBC and cultures Electrolytes Glucose Blood gas Creatinine Liver tests Creatine kinase ECG Chest imaging Brain imaging when another neurological cause is suspected Conventional Treatment ICU admission Airway and ventilatory support IV levothyroxine Consideration of liothyronine in selected severe cases under specialist supervision IV hydrocortisone until adrenal insufficiency is excluded Controlled warming Cautious IV fluid and vasopressor support Treatment of hypoglycemia Controlled correction of hyponatremia Antibiotics for suspected infection Avoidance of sedatives and respiratory depressants Severe hypothyroid crisis requires hospital and ICU care because cardiovascular, respiratory and neurological failure can progress rapidly. Relevant Safety Issues ● The patient may not be literally comatose; confusion or lethargy with systemic decompensation can qualify. ● Treat possible adrenal insufficiency before or with thyroid hormone. ● Thyroid-hormone replacement can provoke ischemia or arrhythmia in susceptible older adults, requiring careful dosing. ● Hypoventilation may require mechanical ventilation. ● Absence of fever does not exclude infection because profound hypothyroidism may blunt the temperature response. Botanical and Supplement Safety ● Do not use iodine, kelp or “thyroid glandular” products. ● Avoid sedating herbs. ● Avoid high-dose ashwagandha because it may alter thyroid function and product potency is variable. ● Do not use oral supplements in reduced consciousness. ● Do not replace standardized levothyroxine with desiccated or unregulated products during crisis. Monitoring Airway and ventilation Core temperature Blood pressure Heart rhythm Sodium Glucose Cortisol assessment Thyroid hormones Infection response Mental status Single Best Next Step Begin ICU stabilization, glucocorticoid coverage and IV thyroid-hormone treatment immediately. Clinical Pearl Myxedema coma often presents as severe hypothyroid decompensation without actual coma. NPLEX Examination Trap Do not give thyroid hormone without considering concurrent adrenal insufficiency. Disease Overview Myxedema coma represents failure of physiological adaptation to severe hypothyroidism, usually after infection, cold exposure, medication withdrawal or another systemic stressor. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Myxedema Coma.”

155

Life-Threatening Acute Asthma With a Silent Chest

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 24-year-old woman with asthma presents with rapidly worsening breathlessness after exposure to a cat. She has used her reliever inhaler repeatedly without benefit. Examination and Investigations Blood pressure: 102/66 mmHg Heart rate: 138/min Respiratory rate: 34/min Oxygen saturation: 84% Unable to speak Sitting upright and using accessory muscles Minimal air entry with almost no wheezing Drowsy and exhausted Peak expiratory flow cannot be performed Blood gas: Rising carbon dioxide

Question 1 of 1NPLEX-SYS-155

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Life-threatening acute asthma with impending ventilatory failure Differential Diagnosis Anaphylaxis Tension pneumothorax Pulmonary embolism Foreign-body aspiration Vocal-cord dysfunction Acute heart failure Severe pneumonia Panic attack Inhalational toxic exposure Key Investigations Treatment comes first: Continuous oxygen saturation Peak flow only if safely possible Blood gas in severe or deteriorating disease ECG Electrolytes Chest imaging when pneumothorax, pneumonia or another diagnosis is suspected Pregnancy testing where relevant Assessment for anaphylaxis Conventional Treatment Oxygen Repeated or continuous inhaled short-acting beta-2-agonist Inhaled ipratropium Early systemic corticosteroid IV magnesium sulfate for severe disease Epinephrine when anaphylaxis is present Critical-care consultation Intubation and controlled ventilation for exhaustion, reduced consciousness or worsening gas exchange ● Evaluation for dynamic hyperinflation and pneumothorax during deterioration Current asthma guidance stresses that short-acting bronchodilator therapy should be accompanied by anti-inflammatory treatment and that severe exacerbations require close reassessment rather than a one-time response check. Relevant Safety Issues ● A rising or normal carbon dioxide in a severely tachypneic patient may indicate fatigue and worsening ventilation. ● Excessive ventilation during intubation can worsen air trapping and hypotension. ● Sedatives should not be used to treat the sensation of breathlessness before respiratory failure is addressed. ● Excess beta-2-agonist exposure may cause tachycardia, tremor, hypokalemia and lactic elevation. ● Consider anaphylaxis when asthma follows an allergen exposure with skin, mucosal or circulatory symptoms. Botanical and Supplement Safety Do not use Ephedra sinica. Avoid essential-oil inhalation. Do not use lobelia or stimulant botanicals as bronchodilator substitutes. Avoid sedating herbs. Supplements cannot replace inhaled and systemic emergency medication. Monitoring Air entry Ability to speak Mental status Oxygen saturation Carbon dioxide Peak flow when feasible Heart rhythm Potassium Response to bronchodilators Need for ventilation Single Best Next Step Start emergency asthma therapy immediately and prepare for advanced airway support. Clinical Pearl A silent chest is often more dangerous than loud wheezing. NPLEX Examination Trap Do not interpret disappearance of wheeze as improvement when air entry and mental status are worsening. Disease Overview Acute asthma involves bronchial smooth-muscle constriction, mucosal edema and mucus obstruction. Severe airflow limitation causes dynamic hyperinflation, respiratory-muscle fatigue and eventually hypercapnic failure. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Life-Threatening Acute Asthma With a Silent Chest.”

156

COPD Exacerbation With Acute Hypercapnic Respiratory Failure

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 69-year-old man with severe COPD presents with increasing dyspnea, cough and purulent sputum. He is using accessory muscles and appears drowsy. Examination and Investigations Blood pressure: 138/76 mmHg Heart rate: 118/min Respiratory rate: 30/min Oxygen saturation: 78% on room air Diffuse wheezing with reduced air entry Mild peripheral edema Chest radiograph: Hyperinflation without pneumothorax Blood gas after controlled oxygen: ○ pH: 7.25 ○ PCO₂: 78 mmHg ○ PO₂: 58 mmHg ● No immediate contraindication to mask ventilation

Question 1 of 1NPLEX-SYS-156

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute COPD exacerbation with hypercapnic respiratory failure Differential Diagnosis Pneumonia Acute heart failure Pulmonary embolism Pneumothorax Sedative overdose Asthma Pleural effusion Acute coronary syndrome Neuromuscular ventilatory failure Key Investigations Serial blood gases Continuous oxygen saturation Chest radiograph ECG CBC Electrolytes Creatinine Troponin and natriuretic peptide when indicated Viral testing Sputum culture in selected severe or resistant-risk cases Evaluation for pulmonary embolism when clinically warranted Conventional Treatment Controlled oxygen with a patient-specific target Noninvasive ventilation Inhaled short-acting beta-2-agonist Inhaled anticholinergic Systemic corticosteroid Antibiotics when bacterial features or ventilation requirements support use Thrombosis prevention when appropriate Treatment of heart failure or infection Intubation if noninvasive ventilation fails or airway protection deteriorates GOLD guidance advises close reassessment after NIV initiation and invasive ventilation when noninvasive support fails or is contraindicated. Relevant Safety Issues ● Oxygen should not be withheld from a hypoxemic patient because of fear of carbon-dioxide retention. ● Repeat blood gas after oxygen and NIV initiation. ● NIV is unsuitable when the patient cannot protect the airway, has uncontrolled vomiting, severe facial trauma or immediate respiratory arrest. ● Sedatives may impair respiratory drive. ● Dynamic hyperinflation may cause hypotension. Botanical and Supplement Safety Avoid sedating respiratory remedies. Avoid essential-oil inhalation and smoke exposure. Do not use ephedra, lobelia or stimulant formulas. Avoid high-dose magnesium supplements without kidney assessment. Herbal expectorants do not replace ventilation or bronchodilators. Monitoring Mental status Respiratory rate Work of breathing Oxygen saturation pH and carbon dioxide NIV tolerance Blood pressure Secretions Need for intubation Single Best Next Step Start noninvasive ventilation and controlled oxygen immediately. Clinical Pearl Acute respiratory acidosis is a major indication for NIV in a cooperative COPD patient without contraindications. NPLEX Examination Trap Do not withhold oxygen completely from a severely hypoxemic COPD patient. Disease Overview COPD exacerbations increase airway inflammation, bronchoconstriction and mucus production. In severe disease, respiratory muscles cannot maintain ventilation, producing carbon-dioxide retention and acidemia. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “COPD Exacerbation With Acute Hypercapnic Respiratory Failure.”

157

Tension Pneumothorax

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 30-year-old man is brought to the emergency department after a high-speed motor-vehicle collision. He becomes rapidly more dyspneic and hypotensive. Examination Blood pressure: 68/38 mmHg Heart rate: 142/min Respiratory rate: 36/min Oxygen saturation: 76% Distended neck veins Trachea appears displaced to the left Right chest expansion is markedly reduced No breath sounds over the right hemithorax Hyperresonant percussion on the right Peripheral pulses are weak

Question 1 of 1NPLEX-SYS-157

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Right tension pneumothorax causing obstructive shock Differential Diagnosis Massive hemothorax Cardiac tamponade Massive pulmonary embolism Airway obstruction Severe asthma with dynamic hyperinflation Diaphragmatic rupture Myocardial contusion Hypovolemic shock Key Investigations Immediate decompression precedes testing. After intervention: Bedside ultrasound Chest radiograph Blood gas CBC Type and crossmatch ECG Trauma CT when stable Reassessment for hemothorax and other injuries Conventional Treatment High-concentration oxygen Immediate chest decompression Definitive chest tube Trauma resuscitation Blood products when hemorrhage coexists Mechanical ventilation adjustments if barotrauma or high airway pressure contributed Repeat assessment for persistent air leak or tube malfunction Relevant Safety Issues ● Do not wait for tracheal deviation; it may be absent or late. ● Positive-pressure ventilation can rapidly worsen an untreated pneumothorax. ● Needle decompression may fail because of inadequate catheter length or incorrect position. ● Persistent shock after decompression should prompt assessment for hemorrhage, tamponade and tube malfunction. ● A tension pneumothorax may occur without trauma. Botanical and Supplement Safety No botanical treatment is appropriate. Do not perform chest manipulation. Do not give oral remedies to an unstable trauma patient. Review anticoagulant supplements if chest-tube bleeding is excessive. Do not delay transport for nonmedical intervention. Monitoring Blood pressure Oxygenation Breath sounds Chest-tube function Air leak Re-expansion Hemorrhage Recurrent tension Associated trauma Single Best Next Step Decompress the chest immediately without waiting for imaging. Clinical Pearl Tension pneumothorax is a clinical diagnosis in the unstable patient. NPLEX Examination Trap Do not require all classic signs, especially tracheal deviation, before acting. Disease Overview Tension pneumothorax occurs when air enters the pleural space but cannot escape. Progressive pressure collapses the lung and reduces cardiac preload, causing obstructive shock. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Tension Pneumothorax.”

158

Acute Angle-Closure Crisis

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 67-year-old woman develops sudden severe right-eye pain, headache, nausea and blurred vision after entering a dark theatre. Examination Right eye is red Cornea appears cloudy Pupil is mid-dilated and poorly reactive Visual acuity is reduced Globe feels firm Intraocular pressure: 52 mmHg Left anterior chamber also appears anatomically narrow No focal neurological deficit

Question 1 of 1NPLEX-SYS-158

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute primary angle-closure crisis of the right eye Differential Diagnosis Anterior uveitis Corneal abrasion Keratitis Scleritis Conjunctivitis Migraine Cluster headache Orbital cellulitis Endophthalmitis Key Investigations Visual acuity Intraocular pressure Slit-lamp examination Pupil assessment Gonioscopy when the cornea permits Optic-nerve examination Evaluation of the fellow eye Medication review for precipitating anticholinergic or adrenergic agents Conventional Treatment Immediate topical pressure-lowering medications Systemic carbonic-anhydrase inhibition when appropriate Hyperosmotic therapy in selected severe cases Pilocarpine after pressure begins to fall and the iris can respond Analgesia and antiemetic treatment Laser peripheral iridotomy Prophylactic definitive treatment of the fellow eye where indicated Lens-based treatment in selected patients Relevant Safety Issues Avoid pupil-dilating drugs. Carbonic-anhydrase inhibitors require renal, electrolyte and allergy assessment. Hyperosmotic treatment can worsen heart or kidney failure. Pilocarpine may be ineffective at extremely high pressure because the iris sphincter is ischemic. ● Do not confuse nausea and headache with a primary neurological disorder without examining the eye. Botanical and Supplement Safety Do not put herbal drops or essential oils in the eye. Avoid anticholinergic sleep and allergy products in susceptible patients without review. Avoid stimulant decongestants where they may precipitate angle closure. Do not delay ophthalmic treatment for acupuncture or headache remedies. Cannabis is not an appropriate acute glaucoma treatment. Monitoring Intraocular pressure Visual acuity Corneal clarity Pupil response Optic-nerve injury Medication adverse effects Fellow-eye risk Definitive iridotomy success Single Best Next Step Lower intraocular pressure immediately and obtain emergency ophthalmological intervention. Clinical Pearl A painful red eye with nausea and a mid-dilated pupil is acute angle closure until proven otherwise. NPLEX Examination Trap Do not administer a mydriatic to facilitate routine examination. Disease Overview Angle closure occurs when the peripheral iris obstructs trabecular outflow. Rapid pressure elevation can cause corneal edema, iris ischemia and irreversible optic-neuropathy damage. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Angle-Closure Crisis.”

159

Central Retinal Artery Occlusion

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 72-year-old man with hypertension and atrial fibrillation develops sudden painless loss of vision in the left eye while reading. Symptoms began 50 minutes ago. Examination and Investigations Visual acuity: Light perception in the left eye Relative afferent pupillary defect No eye pain or redness Fundus examination: ○ Pale retina ○ Cherry-red macular spot ○ Attenuated retinal arteries ● Right eye: Normal ● Neurological examination: No limb weakness or speech deficit

Question 1 of 1NPLEX-SYS-159

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute left central retinal artery occlusion, likely embolic Differential Diagnosis Giant cell arteritis Retinal detachment Vitreous hemorrhage Ischemic optic neuropathy Retinal-vein occlusion Ocular migraine Carotid dissection Acute angle closure Functional visual loss Key Investigations Exact last-known-well time Visual acuity and pupil examination Fundus photography or optical coherence tomography Brain and vascular imaging Carotid imaging ECG and cardiac monitoring Echocardiography where indicated CBC Glucose and lipids ESR, CRP and platelets when giant cell arteritis is possible Neurological stroke assessment Conventional Treatment Immediate transport to a stroke-capable centre Assessment for IV thrombolysis in eligible early presenters under local protocol Exclusion and immediate glucocorticoid treatment of giant cell arteritis when suspected Antithrombotic and vascular-risk management after the acute decision Carotid and cardiac-source treatment Smoking cessation Ophthalmological monitoring for ocular complications AHA guidance notes that conservative treatments such as ocular massage or anterior-chamber paracentesis have not demonstrated convincing benefit and may cause harm or delay effective stroke care. Relevant Safety Issues ● Do not delay emergency referral while arranging an outpatient eye appointment. ● Ask specifically about jaw claudication, scalp tenderness and systemic symptoms in older adults. ● Normal limb strength does not make retinal stroke less urgent. ● Time of onset matters for reperfusion eligibility. ● Avoid empiric anticoagulation before intracranial and vascular assessment. Botanical and Supplement Safety ● Do not use ginkgo, nattokinase or garlic as emergency thrombolytics. ● Avoid high-dose anticoagulant supplements until hemorrhage and treatment plans are assessed. ● Do not delay stroke care for hyperbaric oxygen or alternative circulation therapies. ● Vitamin products do not restore retinal arterial flow. ● Review supplements after stabilization for interaction with antithrombotic therapy. Monitoring Vision Neurological deficits Cardiac rhythm Carotid disease Blood pressure Glucose and lipids Fellow-eye symptoms Neovascular ocular complications Single Best Next Step Treat the sudden painless monocular visual loss as an acute stroke emergency. Clinical Pearl CRAO is retinal infarction, not merely an eye-clinic diagnosis. NPLEX Examination Trap Do not discharge a patient because no cerebral neurological deficit is present. Disease Overview CRAO results from obstruction of retinal arterial blood flow, commonly by embolism. Retinal ischemia produces sudden severe visual loss and signals elevated risk of additional vascular events. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Central Retinal Artery Occlusion.”

160

Acute Epiglottitis With Impending Airway Obstruction

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 6-year-old child with incomplete immunization develops high fever and rapidly progressive sore throat. The child sits leaning forward, refuses to lie down and drools continuously. Examination Temperature: 39.6°C Heart rate: 148/min Respiratory rate: 34/min Inspiratory stridor Muffled voice Drooling Tripod positioning Appears frightened and toxic Minimal cough Oxygen saturation: 91%

Question 1 of 1NPLEX-SYS-160

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute bacterial epiglottitis with threatened airway obstruction Differential Diagnosis Viral croup Bacterial tracheitis Retropharyngeal abscess Peritonsillar abscess Foreign-body aspiration Anaphylaxis Diphtheria ● Thermal or caustic airway injury ● Angioedema Key Investigations Airway safety comes first. After the airway is secured: Direct visualization by experienced clinicians Blood cultures CBC Electrolytes Inflammatory markers Epiglottic or blood cultures when safely obtained Imaging only in stable, uncertain cases Immunization review Conventional Treatment Keep the patient calm and upright. Give supplemental oxygen without forcing a mask if it increases agitation. Arrange controlled airway management. Prepare for emergency surgical airway access. Administer IV antibiotics after airway priorities are addressed. Provide intensive-care monitoring. Give corticosteroid according to specialist protocol where appropriate. Use droplet precautions when the suspected organism requires them. Provide chemoprophylaxis to eligible close contacts when invasive Hib disease is confirmed. Hib vaccination has greatly reduced childhood Hib epiglottitis, but other organisms and incomplete immunization remain relevant. Relevant Safety Issues Do not separate the child from the caregiver unnecessarily. Do not obtain throat swabs before securing the airway. Do not force oral fluids. Do not assume vaccination completely eliminates epiglottitis. Adult supraglottitis may present with severe throat pain and relatively modest visible oral findings. Botanical and Supplement Safety Do not give oral herbs, honey or lozenges during airway compromise. Avoid steam because of burn and agitation risks. Do not apply essential oils near the airway. Echinacea does not replace airway management or antibiotics. Do not delay transfer for home remedies. Monitoring Stridor Drooling Work of breathing Oxygenation Mental status Airway edema Blood pressure Infection response Readiness for extubation Single Best Next Step Maintain calm and secure the airway in a controlled specialist setting. Clinical Pearl In suspected epiglottitis, the safest throat examination may be no examination until an airway team is ready. NPLEX Examination Trap Do not use a tongue depressor in an unstable child with drooling, stridor and tripod positioning. Disease Overview Epiglottitis is acute inflammation and edema of the epiglottis and surrounding supraglottic structures. Rapid swelling can convert partial obstruction into complete airway loss. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Epiglottitis With Impending Airway Obstruction.”

161

Acute Esophageal Variceal Hemorrhage

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 58-year-old man with alcohol-associated cirrhosis presents after vomiting a large quantity of bright-red blood. He is increasingly confused and reports passing black stool. Examination and Investigations Blood pressure: 84/48 mmHg Heart rate: 126/min Respiratory rate: 24/min Cool extremities Distended abdomen with ascites Hemoglobin: 71 g/L Platelets: 74 × 10⁹/L INR: 1.8 Bilirubin: Elevated Creatinine: Increased from baseline

Question 1 of 1NPLEX-SYS-161

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute esophageal or gastroesophageal variceal hemorrhage with hypovolemic shock Differential Diagnosis Peptic-ulcer bleeding Portal-hypertensive gastropathy Gastric antral vascular ectasia Mallory–Weiss tear Erosive gastritis Gastric malignancy Dieulafoy lesion Key Investigations CBC Type and crossmatch INR and fibrinogen Electrolytes and creatinine Liver tests Lactate ● Blood gas when unstable ● ECG ● Urgent upper endoscopy after initial stabilization Conventional Treatment Protect the airway when massive hematemesis or encephalopathy threatens aspiration. Establish large-bore IV access. Use balanced resuscitation and a restrictive transfusion strategy in most patients. Begin octreotide, terlipressin or another appropriate vasoactive agent. Administer antibiotic prophylaxis. Perform urgent endoscopy, generally with variceal band ligation for esophageal varices. Consider balloon tamponade or an esophageal stent only as a temporary bridge in uncontrolled bleeding. ● Consider early or rescue TIPS in appropriately selected patients. ● Treat encephalopathy, kidney injury and infection. Relevant Safety Issues ● Avoid over-resuscitation. ● Correct shock, but do not attempt to normalize the INR routinely with large volumes of plasma solely because it is elevated. ● Avoid NSAIDs. ● Do not delay antibiotic prophylaxis. ● Persistent bleeding despite endoscopy requires immediate escalation. Botanical and Supplement Safety Avoid Ginkgo biloba, concentrated Allium sativum, willow bark and high-dose curcumin. Avoid alcohol completely. Do not use “liver detoxification” products during acute bleeding. Avoid orally administered products while airway protection is uncertain. Monitoring Hemodynamics Ongoing hematemesis or melena Hemoglobin Mental status Urine output Creatinine Lactate ● Rebleeding ● Aspiration ● Infection Single Best Next Step Start resuscitation, vasoactive medication and antibiotics immediately while arranging urgent therapeutic endoscopy. Clinical Pearl Suspected variceal hemorrhage is treated before endoscopic confirmation. NPLEX Examination Trap Do not transfuse automatically to a normal hemoglobin target. Disease Overview Portal hypertension creates fragile portosystemic collateral veins in the esophagus and stomach. Their rupture can cause rapid exsanguination, aspiration and multiorgan failure. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Esophageal Variceal Hemorrhage.”

162

Severe Acute Cholangitis

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 76-year-old woman presents with fever, jaundice and right-upper-quadrant pain. During assessment, she becomes confused and hypotensive. Examination and Investigations Temperature: 39.5°C Blood pressure: 78/44 mmHg Heart rate: 128/min Scleral icterus Right-upper-quadrant tenderness WBC: 19 × 10⁹/L Bilirubin: 162 µmol/L Alkaline phosphatase: Markedly elevated Creatinine: Elevated Platelets: 82 × 10⁹/L Ultrasound: Dilated common bile duct with probable distal stone

Question 1 of 1NPLEX-SYS-162

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe acute ascending cholangitis from choledocholithiasis Differential Diagnosis Acute cholecystitis Gallstone pancreatitis Acute hepatitis Liver abscess Sepsis from another source Malignant biliary obstruction Mirizzi syndrome Acute pyelonephritis Key Investigations Blood cultures CBC Bilirubin and liver enzymes Creatinine and electrolytes INR Lactate Lipase Ultrasound MRCP or CT in selected stable patients ERCP for diagnosis and treatment Conventional Treatment Airway and circulation support IV crystalloid Vasopressor therapy for persistent shock Broad-spectrum IV antibiotics covering enteric organisms Urgent ERCP with drainage and stone extraction or temporary stenting Percutaneous drainage when ERCP is impossible Definitive gallbladder management after stabilization Relevant Safety Issues Do not delay drainage for complete normalization of laboratory abnormalities. Avoid excessive sedation in shock or encephalopathy. Adjust antimicrobial doses for kidney dysfunction. A patient may not display the complete Charcot triad. ● Severe cholangitis may progress rapidly to DIC. Botanical and Supplement Safety Do not use choleretic herbs in obstructed biliary disease. Avoid Chelidonium majus because of hepatotoxicity concerns. Avoid oral products during shock. Herbal antimicrobials do not replace drainage and IV antibiotics. Monitoring Blood pressure Lactate Mental status Bilirubin Kidney function Platelets and coagulation Urine output Response after drainage Recurrent obstruction Single Best Next Step Begin sepsis resuscitation and obtain urgent biliary source control. Clinical Pearl Antibiotics cannot reliably sterilize a severely obstructed infected bile duct. NPLEX Examination Trap Do not require fever, pain and jaundice all to be present before considering cholangitis. Disease Overview Acute cholangitis occurs when bacterial infection develops behind partial or complete biliary obstruction. Rising ductal pressure promotes bacteremia and systemic sepsis. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Severe Acute Cholangitis.”

163

Acute Mesenteric Ischemia

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 73-year-old man with atrial fibrillation suddenly develops severe diffuse abdominal pain. He has vomited twice but has no major abdominal distension. Examination and Investigations Blood pressure: 106/68 mmHg Heart rate: 118/min, irregular Respiratory rate: 24/min Severe subjective pain Abdomen initially soft with mild diffuse tenderness Lactate: 4.6 mmol/L WBC: 17 × 10⁹/L Metabolic acidosis ECG: Atrial fibrillation No therapeutic anticoagulation

Question 1 of 1NPLEX-SYS-163

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Embolic acute mesenteric ischemia from atrial fibrillation Differential Diagnosis Perforated viscus Acute pancreatitis Small-bowel obstruction Aortic dissection Ruptured abdominal aortic aneurysm Acute cholecystitis Mesenteric venous thrombosis Nonocclusive mesenteric ischemia Key Investigations CT angiography of the abdomen and pelvis CBC Lactate and blood gas Electrolytes and creatinine Coagulation studies Type and crossmatch ECG Blood cultures when necrosis or sepsis is suspected A normal early lactate does not safely exclude mesenteric ischemia. Conventional Treatment Immediate surgical and vascular consultation IV fluid resuscitation Broad-spectrum antibiotics IV unfractionated heparin when not contraindicated Endovascular or open arterial revascularization Resection of necrotic bowel Second-look surgery when bowel viability remains uncertain Correction of the underlying embolic or low-flow cause Relevant Safety Issues ● Do not delay CT angiography solely because creatinine is elevated when the condition is immediately life-threatening. ● Opioids may be used for pain but must not delay diagnosis. ● Peritoneal signs suggest infarction and require urgent laparotomy. ● Nonocclusive ischemia can occur during shock or high-dose vasopressor exposure. ● Oral intake should be stopped. Botanical and Supplement Safety Avoid laxatives and stimulant bowel-cleansing products. Do not use nattokinase as an anticoagulant substitute. Avoid oral products when emergency surgery is likely. Herbal analgesia must not delay imaging. Monitoring Pain and abdominal findings Lactate and pH Hemodynamics Urine output Bowel viability Bleeding during anticoagulation Reperfusion injury Short-bowel complications Single Best Next Step Obtain emergency CT angiography and activate mesenteric revascularization care. Clinical Pearl Severe pain with a relatively benign early abdominal examination is a classic warning pattern. NPLEX Examination Trap Do not wait for guarding or rebound tenderness before ordering vascular imaging. Disease Overview Acute mesenteric ischemia is sudden interruption of intestinal blood flow. Without rapid reperfusion, mucosal injury progresses to transmural necrosis, sepsis and death. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Mesenteric Ischemia.”

164

Adrenal Crisis

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 44-year-old woman with autoimmune adrenal insufficiency develops vomiting and diarrhea. She cannot retain her oral hydrocortisone and becomes progressively weak and confused. Examination and Investigations Blood pressure: 72/40 mmHg Heart rate: 126/min Temperature: 38.2°C Dry mucous membranes Diffuse abdominal tenderness Sodium: 121 mmol/L Potassium: 6.0 mmol/L Glucose: 2.8 mmol/L Creatinine: Elevated Cortisol result: Pending

Question 1 of 1NPLEX-SYS-164

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Adrenal crisis precipitated by gastroenteritis and failure of oral steroid absorption Differential Diagnosis Septic shock Hypovolemic shock Hyperkalemic renal failure DKA Severe gastroenteritis Myxedema coma Medication toxicity Acute abdominal catastrophe Key Investigations Blood may be drawn before steroids when this causes no delay: Cortisol ACTH Electrolytes Glucose Creatinine CBC Blood cultures Blood gas ECG Thyroid testing Infection evaluation Conventional Treatment Immediate IV or IM hydrocortisone Rapid isotonic saline IV dextrose for hypoglycemia Continued stress-dose hydrocortisone Hyperkalemia treatment when severe or associated with ECG changes Antibiotics when infection is suspected Transition back to oral glucocorticoid after recovery Review of mineralocorticoid treatment in primary adrenal insufficiency Relevant Safety Issues ● Do not delay steroid administration. ● Dexamethasone may be considered when subsequent cortisol testing must remain interpretable, but hydrocortisone is standard emergency treatment. ● Vomiting requires injectable emergency steroid use. ● Patients need sick-day rules and an emergency injection kit. ● Medical-alert identification is important. Botanical and Supplement Safety Licorice is not an emergency glucocorticoid substitute. Avoid potassium supplements. Avoid fasting and dehydration regimens. Do not replace prescribed steroid therapy with “adrenal support” glandular products. Monitoring Blood pressure Sodium and potassium Glucose Creatinine Urine output Mental status Infection Response to hydrocortisone Single Best Next Step Give parenteral hydrocortisone and isotonic fluid immediately. Clinical Pearl When adrenal crisis is suspected, treat first and confirm later. NPLEX Examination Trap Do not administer thyroid hormone before providing glucocorticoid coverage in possible adrenal insufficiency. Disease Overview Adrenal crisis is acute cortisol deficiency causing reduced vascular responsiveness, volume depletion, metabolic disturbance and shock. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Adrenal Crisis.”

165

Hypercalcemic Crisis

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 69-year-old woman with metastatic breast cancer presents with constipation, thirst, increasing confusion and generalized weakness. Examination and Investigations Blood pressure: 92/58 mmHg Heart rate: 112/min Dry mucous membranes Confused and lethargic Corrected calcium: 3.72 mmol/L Creatinine: 224 µmol/L Phosphate: Low PTH: Suppressed ECG: Shortened QT interval

Question 1 of 1NPLEX-SYS-165

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Malignancy-associated hypercalcemic crisis Differential Diagnosis Primary hyperparathyroidism Vitamin D intoxication Granulomatous disease Multiple myeloma Milk-alkali syndrome Thyrotoxicosis Immobilization-associated hypercalcemia Lithium-associated hyperparathyroidism Key Investigations Repeat corrected and ionized calcium PTH Phosphate Magnesium Creatinine ECG PTH-related peptide where indicated Vitamin D metabolites Serum and urine protein studies Malignancy evaluation Conventional Treatment ● IV isotonic saline with close monitoring ● Calcitonin for rapid short-term reduction in selected severe cases ● IV bisphosphonate or denosumab according to cause, renal function and specialist guidance ● Glucocorticoid for vitamin D-mediated causes ● Dialysis for severe refractory disease with major kidney or cardiac limitations ● Definitive cancer or parathyroid treatment Relevant Safety Issues Monitor older adults and patients with heart or kidney disease for fluid overload. Bisphosphonates act slowly and do not provide immediate relief alone. Calcitonin loses effectiveness with repeated use. Avoid routine phosphate administration without specialist oversight. Confirm calcium adjustment for albumin or measure ionized calcium. Botanical and Supplement Safety Stop calcium and vitamin D products. Avoid vitamin A excess. Avoid thiazide-like or calcium-containing supplements. Do not use high-dose magnesium products in kidney impairment. Review all “bone health” formulas. Monitoring Calcium ECG Mental status Fluid balance Creatinine Urine output Phosphate and magnesium Response to antiresorptive therapy Single Best Next Step Begin monitored IV saline and urgent pharmacological calcium reduction. Clinical Pearl Severe hypercalcemia causes nephrogenic water loss, which worsens dehydration and further reduces renal calcium clearance. NPLEX Examination Trap Do not administer a loop diuretic before restoring intravascular volume. Disease Overview Hypercalcemia affects renal concentrating ability, gastrointestinal motility, neurological function and cardiac conduction. Malignancy and primary hyperparathyroidism cause most clinically significant cases. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Hypercalcemic Crisis.”

166

Severe Symptomatic Hyponatremia

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 61-year-old woman taking hydrochlorothiazide and sertraline develops headache, vomiting and confusion. She then has a generalized seizure. Examination and Investigations Blood pressure: 118/72 mmHg Heart rate: 96/min Oxygen saturation: 96% Postictal and confused Sodium: 108 mmol/L Glucose: Normal Serum osmolality: Low Urine osmolality: Elevated Potassium: 3.0 mmol/L CT head: No hemorrhage

Question 1 of 1NPLEX-SYS-166

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe hypotonic hyponatremia with seizure, likely related to thiazide use and SIADH-promoting medication Differential Diagnosis Adrenal insufficiency Hypothyroidism SIADH Hypovolemic hyponatremia Heart failure Cirrhosis Primary polydipsia ● Low-solute intake ● Pseudohyponatremia Key Investigations Treatment should not wait for the complete etiological workup: Repeat sodium Serum osmolality Urine osmolality Urine sodium Glucose Potassium Creatinine Cortisol TSH and free T4 Medication review Fluid-status assessment Conventional Treatment Airway protection and seizure care Controlled 3% saline bolus Repeat sodium frequently Stop hydrochlorothiazide and other contributing agents Replace potassium carefully Treat the underlying cause Use desmopressin and/or free water under specialist direction if overcorrection occurs or is imminent ● Apply stricter correction limits in patients at high risk of osmotic demyelination Relevant Safety Issues ● Potassium replacement can itself increase serum sodium. ● Malnutrition, alcohol-use disorder, liver disease and severe hypokalemia increase osmotic-demyelination risk. ● Symptoms determine emergency treatment more than the sodium number alone. ● Urine output may increase abruptly when the underlying stimulus resolves, causing rapid sodium correction. ● Frequent laboratory monitoring is essential. Botanical and Supplement Safety Avoid excessive water intake. Stop unreviewed diuretic herbs. Avoid “cleansing” regimens. Do not use licorice or salt supplements without determining the cause. Review serotonergic supplements that may compound medication-associated SIADH. Monitoring Neurological status Seizures Sodium every few hours during active correction Urine output Potassium Fluid balance Signs of overcorrection Delayed neurological deficits Single Best Next Step Give controlled hypertonic saline immediately for the seizure. Clinical Pearl The initial goal is a small, symptom-relieving sodium increase—not immediate normalization. NPLEX Examination Trap Do not correct chronic hyponatremia rapidly simply because the initial sodium is extremely low. Disease Overview Hypotonic hyponatremia causes water movement into brain cells. Acute or severe reductions can produce cerebral edema, seizure, coma and herniation. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Severe Symptomatic Hyponatremia.”

167

Eclampsia

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 29-year-old woman at 37 weeks’ gestation presents with severe headache and flashing lights. During evaluation, she has a generalized tonic-clonic seizure. Examination and Investigations Blood pressure: 184/118 mmHg Hyperreflexia Facial and hand edema Right-upper-quadrant tenderness Platelets: 104 × 10⁹/L AST and ALT: Elevated Creatinine: Elevated Fetal heart tracing: Recurrent decelerations

Question 1 of 1NPLEX-SYS-167

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Eclampsia with severe maternal and fetal features Differential Diagnosis Epilepsy Cerebral venous thrombosis Intracranial hemorrhage Ischemic stroke Posterior reversible encephalopathy syndrome Hypoglycemia Meningitis Toxic ingestion Amniotic-fluid embolism Key Investigations Treatment must not be delayed: CBC and platelets Creatinine AST and ALT Urine protein assessment Glucose Coagulation studies Fetal monitoring Brain imaging when neurological findings are atypical, focal, prolonged or persistent Conventional Treatment Position safely and protect the airway. Give magnesium sulfate. Treat recurrent seizure according to protocol. Administer a rapid-acting pregnancy-appropriate antihypertensive. Use cautious fluid management. Monitor urine output, reflexes and respiration. Proceed toward delivery after maternal stabilization. Manage postpartum recurrence risk. Relevant Safety Issues Do not insert objects into the mouth during seizure. Monitor for magnesium toxicity, especially with kidney dysfunction. Calcium gluconate is used for serious magnesium toxicity. Do not delay seizure treatment for imaging. Eclampsia may occur postpartum. Botanical and Supplement Safety Oral magnesium supplements are not substitutes for IV magnesium sulfate. Avoid licorice because it may worsen hypertension. Avoid herbal labour-induction products. Do not give oral remedies during altered consciousness. Monitoring Respiratory rate Reflexes Urine output Blood pressure Recurrent seizure Platelets and liver enzymes Pulmonary edema Fetal status Postpartum neurological symptoms Single Best Next Step Administer magnesium sulfate, control severe blood pressure and prepare for delivery after stabilization. Clinical Pearl Delivery is definitive treatment, but the mother must first be stabilized. NPLEX Examination Trap Do not use phenytoin or benzodiazepines as routine first-line substitutes for magnesium sulfate. Disease Overview Eclampsia is seizure occurring in association with a hypertensive pregnancy disorder. Endothelial dysfunction, cerebral edema and autoregulatory failure may contribute. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Eclampsia.”

168

HELLP Syndrome

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 34-year-old woman at 33 weeks’ gestation presents with malaise, nausea and severe epigastric and right-upper-quadrant pain. She reports only a mild headache. Examination and Investigations Blood pressure: 158/102 mmHg Right-upper-quadrant tenderness Platelets: 54 × 10⁹/L Hemoglobin: Decreased Blood smear: Schistocytes LDH: Markedly elevated Haptoglobin: Low AST: 386 U/L ALT: 312 U/L Creatinine: Increased Urine protein: 1+ Fetal tracing: Reduced variability

Question 1 of 1NPLEX-SYS-168

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis HELLP syndrome with maternal organ dysfunction and fetal compromise Differential Diagnosis Acute fatty liver of pregnancy TTP Hemolytic uremic syndrome Viral hepatitis Gallbladder disease Lupus flare Immune thrombocytopenia Severe sepsis Placental abruption with DIC Key Investigations Serial CBC and platelets Peripheral smear LDH Bilirubin and haptoglobin AST and ALT Creatinine Urine protein INR, aPTT and fibrinogen Glucose Fetal monitoring Ultrasound when hepatic hematoma or another abdominal diagnosis is suspected Conventional Treatment Hospitalize in an obstetric centre. Stabilize airway, circulation and blood pressure. Administer magnesium sulfate where indicated. Prepare for delivery. Give antenatal corticosteroid for fetal maturation when appropriate and when this does not create unsafe delay. ● Provide platelet and blood-component support according to bleeding and procedural needs. ● Assess for hepatic hematoma, rupture, DIC and kidney failure. ● Continue postpartum monitoring because laboratory abnormalities may initially worsen. Relevant Safety Issues ● Right-upper-quadrant pain can precede catastrophic hepatic complications. ● Avoid neuraxial anesthesia when platelet level or coagulation status is unsafe. ● Do not delay delivery solely to complete corticosteroid dosing when the mother or fetus is unstable. ● HELLP may first appear postpartum. ● Platelet count can decline rapidly. Botanical and Supplement Safety Avoid aspirin-like or anticoagulant botanicals. Avoid licorice and stimulant products. Do not use liver-detoxifying herbs. Stop unreviewed supplements before potential emergency delivery. Monitoring Platelets Hemolysis Liver enzymes Blood pressure Renal function Coagulation Abdominal pain Fetal status Postpartum hemorrhage Single Best Next Step Admit for immediate stabilization and delivery planning. Clinical Pearl HELLP can occur without dramatic hypertension or heavy proteinuria. NPLEX Examination Trap Do not label epigastric pain in late pregnancy as reflux before checking platelets and liver enzymes. Disease Overview HELLP is a severe pregnancy-associated microangiopathic syndrome involving hemolysis, hepatic injury and platelet consumption. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “HELLP Syndrome.”

169

Kawasaki Disease

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 3-year-old child has had fever for six days despite antibiotic treatment for presumed throat infection. Examination and Investigations Temperature: 39.2°C Bilateral nonpurulent conjunctival injection Red cracked lips and strawberry tongue Polymorphous truncal rash Swollen erythematous hands and feet Enlarged unilateral cervical lymph node CRP and ESR: Markedly elevated Platelets: Increasing Sterile pyuria Echocardiogram: Mild coronary-artery dilation

Question 1 of 1NPLEX-SYS-169

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Complete Kawasaki disease with early coronary-artery involvement Differential Diagnosis Scarlet fever Adenovirus Measles Toxic shock syndrome Stevens–Johnson syndrome Systemic juvenile idiopathic arthritis Multisystem inflammatory syndrome Drug hypersensitivity Leptospirosis Key Investigations ● CBC ● CRP and ESR ● Liver enzymes Albumin Electrolytes Urinalysis ECG Echocardiography Serial coronary-artery assessment Infectious testing guided by presentation Conventional Treatment ● IV immunoglobulin ● Aspirin during the acute phase, followed by antiplatelet dosing according to fever resolution and coronary findings ● Additional corticosteroid, infliximab or another immunomodulator for selected high-risk or IVIG-resistant disease ● Serial echocardiography ● Cardiology follow-up ● Anticoagulation for selected large coronary aneurysms Relevant Safety Issues Delay live-virus vaccination after IVIG according to immunization guidance. Monitor for IVIG-associated hemolysis or infusion reactions. Aspirin use requires counselling regarding bleeding and viral illness. Incomplete Kawasaki disease should be considered in infants with prolonged unexplained fever. ● Do not delay echocardiography, but a normal initial study does not exclude the diagnosis. Botanical and Supplement Safety No botanical treatment prevents coronary aneurysm. Avoid unmonitored salicylate-containing botanicals such as willow bark. Do not combine aspirin with multiple bleeding-promoting supplements. Avoid immune-stimulating products during active systemic inflammation. Monitoring Fever Coronary dimensions Cardiac function Platelets Inflammatory markers Aspirin adverse effects IVIG resistance Thrombosis risk Single Best Next Step Administer IVIG promptly with guideline-directed aspirin therapy. Clinical Pearl Treatment should not wait for desquamation or a coronary aneurysm. NPLEX Examination Trap Do not reject aspirin solely because the patient is a child; Kawasaki disease is an important exception. Disease Overview Kawasaki disease is an acute medium-vessel vasculitis of childhood with a particular tendency to affect the coronary arteries. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Kawasaki Disease.”

170

Early-Onset Neonatal Sepsis

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 12-hour-old term newborn becomes lethargic and feeds poorly. The mother had fever during labour, and the membranes were ruptured for 24 hours before delivery. Examination and Investigations Temperature: 35.8°C Heart rate: 178/min Respiratory rate: 68/min Grunting and subcostal retractions Capillary refill: Four seconds Reduced tone ● Glucose: 2.4 mmol/L ● Oxygen saturation: 88% ● Chest examination: Diffuse reduced air entry

Question 1 of 1NPLEX-SYS-170

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Early-onset neonatal bacterial sepsis with respiratory and circulatory compromise Differential Diagnosis Transient tachypnea of the newborn Respiratory distress syndrome Congenital pneumonia Hypoglycemia Critical congenital heart disease Inborn error of metabolism Hypoxic-ischemic encephalopathy Intracranial hemorrhage Neonatal meningitis Key Investigations Treatment proceeds while investigations are collected: Blood culture CBC with differential Glucose Blood gas and lactate Electrolytes Chest radiograph Lumbar puncture when meningitis is possible and the infant is stable enough Placental or maternal cultures where clinically relevant Continuous cardiorespiratory monitoring Conventional Treatment Neonatal airway and oxygen support Temperature control Careful fluid and perfusion management Correction of hypoglycemia Prompt empiric IV antibiotics Lumbar puncture and meningitis-adjusted therapy when indicated Vasopressors and ventilation for organ failure Narrow or stop antibiotics according to cultures and clinical reassessment Monitor for hearing and neurodevelopmental complications after meningitis or severe sepsis WHO’s current guidance for serious bacterial infection in infants aged 0–59 days emphasizes rapid recognition, referral and empiric antimicrobial treatment for critically ill infants. Relevant Safety Issues ● Hypothermia may be a sign of infection. ● A normal initial CBC or CRP does not exclude sepsis. ● Ceftriaxone is generally avoided or carefully restricted in neonates because of bilirubin displacement and calcium-related safety concerns. ● Aminoglycoside dosing requires renal and drug-level monitoring. ● Do not perform lumbar puncture before stabilizing a critically ill infant. Botanical and Supplement Safety Do not give honey, herbal drops or essential oils. Avoid applying traditional substances to the umbilical stump. Oral products may cause aspiration. Maternal supplement use should be included in the neonatal exposure history. Monitoring Respiratory effort Oxygenation Perfusion Temperature Glucose Urine output Cultures Antibiotic levels where indicated Seizures Feeding and neurological status Single Best Next Step Collect blood culture rapidly and begin empiric IV antibiotics with full neonatal supportive care. Clinical Pearl Neonatal sepsis may present with hypothermia and poor feeding rather than fever. NPLEX Examination Trap Do not wait for elevated inflammatory markers before treating a clinically ill newborn. Disease Overview Early-onset neonatal sepsis is invasive infection occurring during the first days of life, usually acquired before or during delivery. Progression to respiratory failure, shock and meningitis can be rapid. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Early-Onset Neonatal Sepsis.”

171

Meningococcal Septicemia

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

An 18-year-old university resident develops fever, severe myalgia and vomiting. Six hours later, he becomes confused and develops a rapidly spreading rash. Examination and Investigations Temperature: 40.0°C Blood pressure: 76/42 mmHg Heart rate: 138/min Respiratory rate: 30/min Oxygen saturation: 92% Cool, mottled extremities Nonblanching petechiae and purpura Neck: Mildly stiff Platelets: 48 × 10⁹/L INR and aPTT: Prolonged Lactate: 6.8 mmol/L Creatinine: Elevated

Question 1 of 1NPLEX-SYS-171

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Meningococcal septicemia with purpura fulminans, septic shock and DIC Differential Diagnosis Rocky Mountain spotted fever Severe pneumococcal sepsis Toxic shock syndrome Viral hemorrhagic illness Immune thrombocytopenia TTP Acute leukemia Disseminated gonococcal infection Key Investigations Blood cultures CBC Electrolytes and creatinine Liver tests Lactate and blood gas INR, aPTT and fibrinogen Glucose Meningococcal PCR where available Lumbar puncture only after stabilization and when safe Conventional Management Immediate IV ceftriaxone or cefotaxime Droplet precautions Oxygen and airway support IV crystalloid with frequent reassessment Norepinephrine for persistent shock Blood-component treatment for clinically significant coagulopathy or hemorrhage Intensive-care admission Public-health notification Chemoprophylaxis for eligible close contacts Empiric treatment of suspected meningococcal disease should include an extended-spectrum cephalosporin, and close contacts require rapid public-health assessment for preventive antibiotics. Relevant Safety Issues Do not delay antibiotics for lumbar puncture. Do not rely on absence of marked neck stiffness. The rash may begin as small petechiae before becoming purpuric. Avoid intramuscular injections during severe coagulopathy. Healthcare exposure precautions should be implemented promptly. Botanical and Supplement Safety No botanical antimicrobial is appropriate. Do not give oral products during altered consciousness. Avoid aspirin, willow bark and bleeding-promoting supplements. Do not use echinacea or immune stimulants instead of antibiotics. Single Best Next Step Administer IV ceftriaxone and activate the septic-shock pathway immediately. Clinical Pearl Fever plus a rapidly progressive nonblanching rash is meningococcal disease until proven otherwise. NPLEX Examination Trap Do not wait for meningitis findings; meningococcemia may occur with minimal meningeal symptoms. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Meningococcal Septicemia.”

172

Pediatric Intussusception

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 10-month-old infant has repeated episodes of sudden crying and draws both knees toward the abdomen. Between episodes, the infant becomes quiet and lethargic. Examination and Investigations Temperature: 37.5°C Heart rate: 128/min Blood pressure: Stable Mild dehydration Abdomen: Soft between pain episodes Palpable elongated mass in the right upper abdomen Stool contains mucus and a small amount of blood No guarding or rebound tenderness

Question 1 of 1NPLEX-SYS-172

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Ileocolic intussusception Differential Diagnosis Gastroenteritis Volvulus Incarcerated hernia Appendicitis Meckel diverticulum ● Constipation ● Henoch–Schönlein purpura ● Bowel duplication cyst Key Investigations Abdominal ultrasound CBC Electrolytes Glucose Type and screen when surgery may be required Abdominal radiograph if perforation or advanced obstruction is suspected Conventional Management Keep the child NPO. Establish IV access. Correct dehydration. Obtain pediatric surgery involvement. Perform pneumatic or contrast-enema reduction when no perforation or peritonitis is present. ● Proceed to surgery if the child is unstable, perforation is suspected or enema reduction fails. Image-guided air or contrast enema is both diagnostic and therapeutic in uncomplicated ileocolic intussusception, with high reduction success in appropriate children. Relevant Safety Issues The classic “currant-jelly” stool is often a late finding and is not required. Lethargy may be a prominent presentation. Peritoneal signs or free air are contraindications to routine enema reduction. Recurrence can occur after successful reduction. Do not force oral fluids before obstruction is addressed. Botanical and Supplement Safety Avoid laxatives, castor oil and stimulant bowel formulas. Do not use herbal antispasmodics to suppress recurrent pain. Avoid oral remedies while the child is NPO. Do not delay imaging for dietary treatment. Single Best Next Step Obtain an urgent abdominal ultrasound. Clinical Pearl Intussusception pain is intermittent because bowel peristalsis repeatedly pulls the affected segment inward. NPLEX Examination Trap Do not wait for the complete triad of pain, mass and bloody stool. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Pediatric Intussusception.”

173

Hypertrophic Pyloric Stenosis

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 5-week-old male infant has progressively worsening projectile vomiting after feeding. The vomitus is not green. The infant remains hungry after vomiting. Examination and Investigations Weight: Below birth-growth trajectory Dry mucous membranes Visible upper-abdominal peristaltic waves Small, firm epigastric mass Sodium: 132 mmol/L Potassium: 3.0 mmol/L Chloride: 82 mmol/L Bicarbonate: 36 mmol/L Ultrasound: Thickened and elongated pyloric muscle

Question 1 of 1NPLEX-SYS-173

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Infantile hypertrophic pyloric stenosis Differential Diagnosis Gastroesophageal reflux Cow’s-milk protein allergy Gastroenteritis Malrotation with volvulus Increased intracranial pressure Congenital adrenal hyperplasia ● Metabolic disorder ● Overfeeding Key Investigations Abdominal ultrasound Electrolytes Blood gas or bicarbonate Glucose Creatinine Weight and hydration status Conventional Management Keep the infant NPO. Insert IV access. Administer isotonic fluid. Replace chloride and potassium appropriately. Monitor urine output. Repeat electrolytes until the alkalosis and volume depletion are corrected. Perform pyloromyotomy after medical stabilization. Relevant Safety Issues ● Bilious vomiting suggests obstruction distal to the stomach and is not typical pyloric stenosis. ● Potassium should generally not be added until urine output is established. ● Metabolic alkalosis may suppress respiratory drive. ● Do not proceed to anesthesia solely because the ultrasound is diagnostic. ● Continued weight loss or lethargy requires urgent intervention. Botanical and Supplement Safety Do not give herbal antiemetics. Avoid gripe water and essential oils. Do not provide oral products to a dehydrated vomiting infant. Formula changes do not correct the obstruction. Single Best Next Step Correct the fluid, chloride and potassium deficits before pyloromyotomy. Clinical Pearl The infant is often hungry immediately after vomiting because feeding desire remains intact despite gastric obstruction. NPLEX Examination Trap Do not rush directly to surgery before correcting metabolic alkalosis. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Hypertrophic Pyloric Stenosis.”

174

Acute Appendicitis in a Child

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

An 11-year-old child develops central abdominal discomfort that moves to the right lower quadrant over 18 hours. The child has anorexia, nausea and pain while walking. Examination and Investigations Temperature: 38.0°C Heart rate: 108/min Right-lower-quadrant tenderness Guarding without generalized rigidity Pain with hopping WBC: 14.2 × 10⁹/L CRP: Elevated Urinalysis: Mild ketones; no significant pyuria Pregnancy test: Negative

Question 1 of 1NPLEX-SYS-174

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute appendicitis Differential Diagnosis Mesenteric adenitis Gastroenteritis Constipation Ovarian torsion Ectopic pregnancy Urinary infection Renal colic Meckel diverticulitis Crohn disease Key Investigations Abdominal ultrasound CBC CRP Electrolytes Urinalysis Pregnancy testing where relevant MRI or CT when ultrasound is nondiagnostic and suspicion remains significant Conventional Management Keep the child NPO. Establish IV access. Provide isotonic fluid. Administer appropriate analgesia. Obtain surgical consultation. Give antibiotics when appendicitis is confirmed or strongly suspected. Perform appendectomy in most uncomplicated cases, with selective nonoperative treatment used under defined pediatric surgical protocols. Relevant Safety Issues Analgesia does not prevent accurate diagnosis and should not be withheld. A normal WBC does not exclude appendicitis. Diarrhea may occur, particularly with a pelvic appendix. Perforation may produce temporary pain reduction followed by generalized deterioration. Avoid repeated CT imaging when an ultrasound or MRI pathway is appropriate. Botanical and Supplement Safety Avoid castor oil and stimulant laxatives. Do not use oral botanicals when surgery may be required. Avoid heat applications that delay reassessment. Herbal antimicrobials do not prevent perforation. Single Best Next Step Obtain urgent ultrasound and pediatric surgical evaluation. Clinical Pearl Pain usually precedes vomiting in appendicitis; vomiting commonly precedes pain in gastroenteritis. NPLEX Examination Trap Do not exclude appendicitis because the child has diarrhea or mild urinary abnormalities. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Appendicitis in a Child.”

175

Ovarian Torsion

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 17-year-old adolescent presents with sudden severe left-lower-quadrant pain and vomiting. The pain began during physical activity and has remained intense. Examination and Investigations Heart rate: 116/min Left-lower-quadrant tenderness Mild guarding Pregnancy test: Negative Ultrasound: ○ Enlarged left ovary ○ Peripheral follicles ○ Pelvic free fluid ○ Some arterial Doppler flow remains

Question 1 of 1NPLEX-SYS-175

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Left adnexal torsion Differential Diagnosis Ruptured ovarian cyst Hemorrhagic ovarian cyst Ectopic pregnancy Appendicitis Renal colic Pelvic inflammatory disease Endometriosis Gastroenteritis Key Investigations ● Pregnancy test Pelvic ultrasound with Doppler CBC Urinalysis STI testing when appropriate Type and screen when hemorrhage is possible Imaging supports the diagnosis but cannot definitively exclude torsion. Conventional Management Immediate gynecology consultation NPO status IV fluid and analgesia Urgent laparoscopy Detorsion with ovarian preservation whenever feasible Cystectomy when appropriate Oophoropexy in selected recurrent or high-risk cases Relevant Safety Issues Do not delay surgery for repeat Doppler testing when suspicion is high. A normal or minimally elevated WBC is not reassuring. Severe intermittent pain may reflect torsion and spontaneous partial detorsion. Ovarian appearance at surgery does not always predict viability. Conservative ovarian preservation is generally preferred in adolescents. Botanical and Supplement Safety Do not use castor oil, emmenagogues or pelvic massage. Avoid oral products before emergency anesthesia. Do not treat suspected torsion with analgesic botanicals alone. Avoid heat applications that delay care. Single Best Next Step Proceed to urgent diagnostic laparoscopy and detorsion. Clinical Pearl Ovarian Doppler flow does not rule out torsion. NPLEX Examination Trap Do not wait for absent blood flow before calling gynecology. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Ovarian Torsion.”

176

Testicular Torsion

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 15-year-old boy develops sudden severe right scrotal pain while sleeping. He vomits twice on the way to the emergency department. Examination Right testis: High-riding and horizontally oriented Marked testicular tenderness Scrotal swelling Cremasteric reflex: Absent on the right No dysuria No urethral discharge Symptom duration: Three hours

Question 1 of 1NPLEX-SYS-176

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Right testicular torsion Differential Diagnosis Epididymitis Torsion of the appendix testis Incarcerated inguinal hernia Testicular trauma Orchitis Testicular tumour with hemorrhage Idiopathic scrotal edema Key Investigations No imaging is required before surgery when the clinical probability is high. When the diagnosis is uncertain and imaging is immediately available without causing delay: ● Doppler ultrasound ● Urinalysis ● STI testing where appropriate Conventional Management Immediate urologic consultation Emergency scrotal exploration Detorsion Bilateral orchiopexy Orchiectomy only when the testis is clearly nonviable Manual detorsion may be attempted as a temporary measure when surgery is being prepared, but it does not replace exploration and fixation. Relevant Safety Issues Pain may temporarily improve after spontaneous detorsion. Previous similar episodes suggest intermittent torsion. A present cremasteric reflex reduces but does not eliminate the possibility. Ultrasound should not delay surgery in a classic case. Both testes are generally fixed because the anatomical predisposition is commonly bilateral. Botanical and Supplement Safety Do not use scrotal massage. Avoid oral remedies before anesthesia. Do not use anti-inflammatory supplements to delay referral. Ice does not restore blood flow. Single Best Next Step Proceed directly to emergency surgical exploration. Clinical Pearl Sudden scrotal pain with nausea or vomiting is torsion until proven otherwise. NPLEX Examination Trap Do not diagnose epididymitis reflexively in an adolescent without urinary symptoms. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Testicular Torsion.”

177

Placental Abruption

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 36-year-old woman at 35 weeks’ gestation develops sudden severe abdominal pain and vaginal bleeding after a motor-vehicle collision. Examination and Investigations Blood pressure: 82/48 mmHg Heart rate: 130/min Abdomen: Firm, tender uterus Frequent contractions Vaginal bleeding: Moderate Fetal heart rate: Recurrent late decelerations Hemoglobin: Falling Fibrinogen: Low Platelets: Decreased

Question 1 of 1NPLEX-SYS-177

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe placental abruption with hemorrhagic shock and fetal compromise Differential Diagnosis Placenta previa Uterine rupture Vasa previa Cervical or vaginal bleeding Preterm labour Bloody show Abdominal trauma without abruption DIC from another cause Key Investigations Treatment proceeds simultaneously with: CBC Type and crossmatch Fibrinogen INR and aPTT Electrolytes and creatinine Kleihauer–Betke or fetomaternal hemorrhage testing where indicated Continuous fetal monitoring Ultrasound to assess placental location and fetal status without delaying intervention Conventional Management Activate obstetric hemorrhage response. Establish large-bore IV access. Provide blood-product resuscitation. Correct hypofibrinogenemia and coagulopathy. Administer Rh immune globulin when indicated. Proceed to urgent cesarean delivery when the fetus is alive with persistent distress and vaginal delivery is not imminent. ● Manage DIC, kidney injury and postpartum hemorrhage. Relevant Safety Issues ● Maternal vital signs may deteriorate despite apparently modest vaginal bleeding. ● Fibrinogen may fall early and substantially. ● Do not delay delivery to complete antenatal corticosteroids when maternal or fetal status is unstable. ● Avoid digital vaginal examination until placenta previa has been excluded. ● Trauma-related abruption can occur even when abdominal injury appears minor. Botanical and Supplement Safety Do not use herbal tocolytics or uterotonics. Avoid anticoagulant supplements. Do not give oral products during hemorrhagic shock. Avoid blue cohosh, pennyroyal and unregulated labour products. Single Best Next Step Resuscitate the mother and expedite delivery. Clinical Pearl The severity of placental abruption does not correlate reliably with visible vaginal blood loss. NPLEX Examination Trap Do not wait for ultrasound confirmation in a clinically unstable patient. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Placental Abruption.”

178

Acute Pyelonephritis During Pregnancy

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 27-year-old woman at 24 weeks’ gestation presents with fever, vomiting, dysuria and right-flank pain. Examination and Investigations Temperature: 39.1°C Blood pressure: 96/58 mmHg Heart rate: 122/min Right costovertebral-angle tenderness WBC: 17 × 10⁹/L Creatinine: Mildly elevated Urinalysis: ○ Leukocyte esterase positive ○ Nitrites positive ○ Pyuria ● Fetal heart rate: 174/min

Question 1 of 1NPLEX-SYS-178

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute pyelonephritis in pregnancy Differential Diagnosis Renal colic Appendicitis Chorioamnionitis Acute cholecystitis Placental abruption Lower urinary infection Pneumonia Ovarian torsion Key Investigations Urine culture CBC Electrolytes and creatinine Blood cultures when septic Lactate when unstable Fetal assessment Renal ultrasound if obstruction, stone or abscess is suspected Conventional Management Hospital admission IV pregnancy-appropriate antimicrobial therapy IV fluid with reassessment Antipyretic and antiemetic treatment Sepsis monitoring Fetal monitoring appropriate to gestational age Transition to oral antibiotics after clinical improvement Complete a full treatment course Consider suppressive therapy after recurrent infection according to obstetric guidance Relevant Safety Issues Avoid fluoroquinolones unless a specialist determines that benefit outweighs risk. Avoid tetracyclines. Nitrofurantoin and fosfomycin are not appropriate treatment for pyelonephritis. Monitor for pulmonary complications. Persistent fever should prompt evaluation for obstruction, renal abscess or resistant organisms. Botanical and Supplement Safety Cranberry may be used as food but not as acute treatment. Avoid Arctostaphylos uva-ursi during pregnancy. Avoid juniper and strong diuretic herbs. Do not use essential oils internally. Review all herbal products for pregnancy safety. Single Best Next Step Admit and begin empiric IV antibiotics. Clinical Pearl Pregnancy-associated pyelonephritis is an inpatient disease at initial presentation. NPLEX Examination Trap Do not use a bladder-only antibiotic to treat renal parenchymal infection. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Pyelonephritis During Pregnancy.”

179

Acute Urinary Retention From BPH and Anticholinergic Use

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

A 74-year-old man with longstanding weak urinary stream develops severe suprapubic pain and inability to urinate after taking an over-the-counter cold medication containing diphenhydramine. Examination and Investigations Blood pressure: 154/86 mmHg Heart rate: 108/min Distended, tender bladder Prostate: Enlarged, smooth and nontender No blood at the urethral opening No pelvic trauma Bladder scan: 920 mL Creatinine: Mildly elevated Urinalysis: No significant infection

Question 1 of 1NPLEX-SYS-179

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute urinary retention due to BPH, precipitated by anticholinergic medication Differential Diagnosis Urethral stricture Prostate cancer Neurogenic bladder Severe constipation Urinary infection Bladder stone Medication-associated retention Cauda equina syndrome Key Investigations Bladder scan Urinalysis and culture where indicated Creatinine and electrolytes Medication review ● Neurological examination ● Prostate examination ● Renal ultrasound when kidney injury, hydronephrosis or chronic retention is suspected Conventional Management Immediate urethral catheterization Use a coude catheter or urologic assistance if standard placement fails Suprapubic drainage when urethral catheterization is impossible or contraindicated Stop precipitating anticholinergic medication Begin an alpha blocker when appropriate Arrange a monitored trial without catheter Evaluate for definitive BPH treatment after stabilization Relevant Safety Issues ● Blood at the urethral meatus, pelvic trauma or suspected urethral injury requires urethral evaluation before blind catheterization. ● Monitor for post-obstructive diuresis. ● Hematuria may occur after decompression. ● Persistent kidney dysfunction requires upper-tract evaluation. ● New saddle anesthesia or leg weakness suggests a neurological emergency. Botanical and Supplement Safety Avoid anticholinergic sleep products. Review decongestants and stimulant cold remedies. Saw palmetto should not replace urgent bladder drainage. Avoid diuretic herbs during obstruction. Do not combine multiple “prostate” products without interaction review. Single Best Next Step Decompress the bladder immediately with a urethral catheter. Clinical Pearl Over-the-counter antihistamines are common triggers of urinary retention in older men with BPH. NPLEX Examination Trap Do not wait for an alpha blocker to work while the bladder remains painfully distended. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Urinary Retention From BPH and Anticholinergic Use.”

180

Displaced Hip Fracture in an Older Adult

1 questions ·

GEA: Medical InterventionsSEA: Endocrine, Cardiopulmonary, Gastrointestinal, Obstetric & Pediatric Emergencies

System-based clinical case

An 86-year-old woman falls while walking to the bathroom. She immediately develops severe left-groin pain and cannot stand. Examination and Investigations Left leg shortened and externally rotated Severe pain with minimal hip movement Distal circulation and sensation intact Radiograph: Displaced intracapsular femoral-neck fracture Hemoglobin: 108 g/L Creatinine: Normal Mild baseline cognitive impairment No unstable cardiac or respiratory disorder

Question 1 of 1NPLEX-SYS-180

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Displaced intracapsular femoral-neck fracture Differential Diagnosis Intertrochanteric fracture Pelvic fracture Acetabular fracture Hip dislocation Occult nondisplaced fracture Pathological fracture Severe hip osteoarthritis Key Investigations Hip and pelvis radiographs MRI or CT when plain films are negative but suspicion remains high CBC Electrolytes and kidney function ECG according to comorbidity Coagulation assessment Type and screen Evaluation of the cause of the fall Conventional Management Prompt multimodal analgesia Consideration of a regional nerve block Orthopedic and geriatric co-management Pressure-injury prevention VTE prophylaxis Expedited arthroplasty or fixation according to fracture and patient factors Early postoperative mobilization Osteoporosis assessment and secondary-fracture prevention Relevant Safety Issues Undertreated pain can contribute to delirium. Opioids should be carefully titrated rather than withheld completely. Anticoagulant use requires coordinated reversal or timing decisions. Correct dehydration, major electrolyte disorders and unstable cardiopulmonary conditions. ● Do not delay surgery for minor stable abnormalities. Botanical and Supplement Safety Review garlic, ginkgo, curcumin and other products that may increase bleeding. Avoid sedating botanical sleep products. Calcium and vitamin D may support later bone care but do not treat the acute fracture. Do not delay surgery for alternative bone-healing remedies. Monitoring ● Pain Delirium Hemoglobin Hydration Pressure areas Thromboembolism Postoperative mobility Falls risk Single Best Next Step Admit for orthogeriatric care and expedited operative repair. Clinical Pearl A hip fracture is both an orthopedic injury and a geriatric medical emergency. NPLEX Examination Trap Do not postpone surgery for nonessential investigations. Disease Overview Femoral-neck fractures commonly occur after low-energy falls in older adults with osteoporosis. Intracapsular displacement may interrupt femoral-head blood flow and generally requires operative treatment. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine and specialty-society guideline relevant to the endocrine, cardiopulmonary, gastrointestinal, obstetric, or pediatric emergency addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Displaced Hip Fracture in an Older Adult.”

181

Acute Ischemic Stroke With Large-Vessel Occlusion

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 67-year-old man suddenly develops aphasia and right-sided weakness while eating breakfast. His last known well time was 90 minutes ago. Examination and Investigations ● Blood pressure: 178/102 mmHg Heart rate: 84/min Glucose: 6.4 mmol/L Dense right facial and arm weakness Expressive and receptive aphasia NIH Stroke Scale score: 17 Noncontrast CT: No hemorrhage CT angiography: Left M1 middle-cerebral-artery occlusion No recent surgery or known major bleeding risk

Question 1 of 1NPLEX-SYS-181

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute left middle-cerebral-artery ischemic stroke caused by M1 occlusion Differential Diagnosis Intracerebral hemorrhage Postictal Todd paralysis Hypoglycemia Hemiplegic migraine Brain tumour Functional neurological disorder Subdural hematoma Encephalitis Key Investigations Exact last-known-well time Noncontrast head CT CT or MR angiography Glucose CBC and platelets INR and aPTT when clinically relevant Creatinine without delaying urgent vascular imaging ECG and cardiac monitoring Perfusion imaging in selected extended-window cases Conventional Management ● Activate the stroke pathway. Maintain airway and oxygenation. Treat hypoglycemia or fever. Administer guideline-approved IV thrombolysis when eligible. Arrange immediate thrombectomy. Avoid delays for unnecessary laboratory or imaging tests. Admit to a stroke or neurocritical-care unit. Obtain follow-up imaging before routine antithrombotic therapy after thrombolysis. Begin secondary-prevention evaluation after stabilization. Relevant Safety Issues Do not give aspirin before thrombolysis has been assessed. Avoid excessive blood-pressure reduction. Do not delay thrombectomy referral because IV thrombolysis has been given. Monitor for angioedema and intracranial hemorrhage after thrombolysis. Dysphagia screening is required before oral intake. Botanical and Supplement Safety Do not use nattokinase, ginkgo or garlic as thrombolytic substitutes. Stop unreviewed bleeding-promoting supplements during acute reperfusion care. Do not give oral remedies before swallowing safety is assessed. Supplements cannot reopen a large cerebral artery. Monitoring Neurological examination Blood pressure Airway and oxygenation Signs of intracranial hemorrhage Angioedema Glucose Cardiac rhythm Reperfusion outcome Single Best Next Step Begin IV reperfusion therapy when eligible and move directly to mechanical-thrombectomy care. Clinical Pearl IV thrombolysis and thrombectomy are complementary, not competing, treatments. NPLEX Examination Trap Do not wait for MRI or thrombectomy transfer before giving an eligible IV thrombolytic. Disease Overview Acute ischemic stroke occurs when cerebral arterial flow is obstructed. A proximal large-vessel occlusion can rapidly infarct extensive brain tissue unless blood flow is restored. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Ischemic Stroke With Large-Vessel Occlusion.”

182

Intracerebral Hemorrhage During Apixaban Therapy

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 78-year-old woman taking apixaban for atrial fibrillation suddenly develops severe headache, vomiting and left-sided weakness. Her last apixaban dose was three hours ago. Examination and Investigations Blood pressure: 208/116 mmHg Heart rate: 88/min Reduced level of consciousness Dense left hemiparesis CT head: Right basal-ganglia hemorrhage with early intraventricular extension Platelets: Normal Creatinine: Mildly elevated

Question 1 of 1NPLEX-SYS-182

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Apixaban-associated spontaneous intracerebral hemorrhage Differential Diagnosis ● Ischemic stroke ● Hemorrhagic transformation of infarction ● Cerebral amyloid angiopathy Vascular malformation Brain tumour with hemorrhage Cerebral venous thrombosis Traumatic intracranial bleeding Key Investigations Immediate noncontrast CT Repeat CT to assess expansion CT angiography when a vascular lesion or active bleeding is suspected CBC and platelets Creatinine Coagulation tests Drug timing and dose Anti-Xa level when rapidly available ECG Conventional Management Stop anticoagulation. Administer guideline-directed reversal. Carefully lower markedly elevated blood pressure. Admit to neurocritical care. Repeat neuroimaging. Manage intracranial pressure. Obtain neurosurgical consultation for hydrocephalus, deterioration or selected hematoma locations. ● Use mechanical VTE prevention initially. ● Reassess long-term anticoagulation only after individualized risk evaluation. Relevant Safety Issues Routine coagulation tests may not accurately measure apixaban activity. Reversal should not be delayed for a normal INR. Avoid hypotension during blood-pressure treatment. Monitor for thrombosis after reversal agents. Early neurological decline may indicate hematoma expansion or hydrocephalus. Botanical and Supplement Safety ● Stop ginkgo, nattokinase, concentrated garlic and high-dose curcumin. ● Avoid fish-oil megadoses during active intracranial bleeding. ● Do not use vitamin K as a specific reversal agent for apixaban. ● Avoid oral products during reduced consciousness. Monitoring Neurological status Blood pressure Hematoma expansion Intracranial pressure Hydrocephalus Kidney function Thrombosis after reversal Airway protection Single Best Next Step Reverse the factor-Xa inhibitor immediately while controlling blood pressure and arranging neurocritical care. Clinical Pearl A normal INR does not exclude clinically important apixaban activity. NPLEX Examination Trap Do not wait for specialized anticoagulant levels when the exposure and hemorrhage are clear. Disease Overview Intracerebral hemorrhage produces direct tissue injury, mass effect and secondary edema. Anticoagulants increase the likelihood of hematoma expansion and poor outcome. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Intracerebral Hemorrhage During Apixaban Therapy.”

183

Aneurysmal Subarachnoid Hemorrhage

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 52-year-old woman develops a sudden explosive headache while exercising. She vomits and briefly loses consciousness. Examination and Investigations Blood pressure: 182/104 mmHg Severe headache and photophobia Neck stiffness Mild confusion No focal weakness CT head: Diffuse subarachnoid blood within the basal cisterns ECG: Nonspecific ST–T abnormalities Troponin: Mildly elevated

Question 1 of 1NPLEX-SYS-183

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Aneurysmal subarachnoid hemorrhage Differential Diagnosis Reversible cerebral vasoconstriction syndrome Cervical-artery dissection Cerebral venous thrombosis Pituitary apoplexy Meningitis Migraine Intracerebral hemorrhage Hypertensive encephalopathy Key Investigations CT angiography Catheter angiography when required CBC Electrolytes Coagulation studies ECG and troponin Continuous cardiac monitoring Serial neurological examinations Transcranial Doppler or other monitoring for vasospasm according to protocol Conventional Management Admit to neurocritical care. Secure the aneurysm by coiling or clipping. Administer enteral nimodipine when feasible. Control blood pressure while preserving cerebral perfusion. Reverse anticoagulants. Treat hydrocephalus with CSF diversion when indicated. Maintain euvolemia. Monitor for delayed cerebral ischemia. Treat seizures when present. Relevant Safety Issues The risk of rebleeding is highest early. Do not delay aneurysm treatment for extensive nonessential testing. Hyponatremia may develop. Cardiac abnormalities can occur from neurogenic stress and do not necessarily represent primary coronary occlusion. ● Sudden neurological decline may indicate rebleeding or hydrocephalus. Botanical and Supplement Safety Stop bleeding-promoting supplements. Avoid stimulant and vasoconstrictive products. Do not use herbal headache remedies in place of neurovascular care. Avoid oral products when consciousness or swallowing is impaired. Monitoring Level of consciousness Rebleeding Blood pressure Hydrocephalus Sodium Cardiac rhythm Vasospasm and delayed ischemia Seizures Single Best Next Step Identify and secure the ruptured aneurysm urgently in a neurovascular centre. Clinical Pearl A thunderclap headache reaching maximum intensity immediately is subarachnoid hemorrhage until proven otherwise. NPLEX Examination Trap Do not perform lumbar puncture when CT has already demonstrated subarachnoid blood. Disease Overview Aneurysmal subarachnoid hemorrhage occurs when an intracranial aneurysm ruptures into the subarachnoid space. Rebleeding, hydrocephalus and delayed cerebral ischemia are major causes of mortality and disability. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Aneurysmal Subarachnoid Hemorrhage.”

184

Acute Bacterial Meningitis With Indication for CT Before Lumbar Puncture

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 68-year-old man presents with fever, headache and progressive confusion. During assessment, he has a focal seizure and develops mild right-arm weakness. Examination and Investigations Temperature: 39.4°C Blood pressure: 104/66 mmHg Heart rate: 118/min Neck stiffness Reduced consciousness Right-arm weakness New focal seizure WBC: 19 × 10⁹/L Glucose: Normal Blood cultures not yet collected

Question 1 of 1NPLEX-SYS-184

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute bacterial meningitis Differential Diagnosis Herpes simplex encephalitis Brain abscess Subarachnoid hemorrhage Severe sepsis with encephalopathy Tuberculous meningitis Fungal meningitis Cerebral venous thrombosis Intracranial tumour Key Investigations Blood cultures CBC Electrolytes and kidney function Glucose Coagulation studies CT head before lumbar puncture CSF cell count, glucose, protein, Gram stain, culture and molecular testing when safe HIV testing where appropriate Additional encephalitis studies based on presentation Conventional Management Airway and hemodynamic support Droplet precautions when meningococcal disease is possible Dexamethasone with or before the first antibiotic Empiric IV ceftriaxone or cefotaxime plus vancomycin Add ampicillin for Listeria risk in older or immunocompromised adults Add acyclovir when encephalitis remains plausible Tailor treatment to microbiology Manage seizure and intracranial-pressure complications Relevant Safety Issues ● Do not delay antibiotics for CT or lumbar puncture. Obtain blood cultures first only when this can be done immediately. Adjust antimicrobial doses for kidney function. Dexamethasone is most useful when started before or with initial antibiotics. A normal peripheral WBC does not exclude meningitis. Botanical and Supplement Safety Herbal antimicrobials do not penetrate or sterilize infected CSF reliably. Avoid oral products during reduced consciousness. Do not use fever-reducing herbs to postpone emergency care. Echinacea is not a substitute for antimicrobial therapy. Monitoring Consciousness Seizures Blood pressure Sodium Hearing Focal deficits Intracranial pressure Culture and PCR results Antibiotic toxicity Single Best Next Step Give dexamethasone and empiric IV antibiotics immediately after rapid blood cultures, then obtain CT before lumbar puncture. Clinical Pearl When lumbar puncture must be delayed, antibiotics must not be delayed with it. NPLEX Examination Trap Do not wait for CT results before treating strongly suspected bacterial meningitis. Disease Overview Bacterial meningitis is infection of the meninges and CSF. Inflammatory injury can rapidly cause cerebral edema, infarction, seizure, hearing loss and death. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Bacterial Meningitis With Indication for CT Before Lumbar Puncture.”

185

Convulsive Status Epilepticus

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 35-year-old woman with epilepsy has generalized tonic-clonic movements lasting eight minutes without recovery of consciousness. Examination and Investigations Oxygen saturation: 86% Heart rate: 142/min Blood pressure: 168/94 mmHg Ongoing generalized convulsions Glucose: 5.8 mmol/L No immediately apparent trauma IV access has been obtained

Question 1 of 1NPLEX-SYS-185

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Convulsive status epilepticus Differential Diagnosis Psychogenic nonepileptic event Hypoglycemic seizure Eclampsia Drug toxicity Alcohol withdrawal CNS infection Intracranial hemorrhage Ischemic stroke Electrolyte disturbance Key Investigations Treatment occurs simultaneously with: ● Point-of-care glucose ● Oxygenation and capnography ● Electrolytes Calcium and magnesium CBC Kidney and liver function Toxicology testing where appropriate Antiseizure medication levels Pregnancy testing CT or MRI after stabilization EEG for persistent altered consciousness or suspected nonconvulsive status Conventional Management Protect the airway and provide oxygen. Administer IV lorazepam or an equivalent first-line benzodiazepine. Repeat once according to protocol if seizure continues. Load levetiracetam, fosphenytoin, valproate or another accepted second-line medication. ● Intubate and begin anesthetic infusion for refractory status. ● Treat the underlying cause. ● Monitor for rhabdomyolysis, acidosis, aspiration and hyperthermia. Relevant Safety Issues ● Underdosing benzodiazepines is a common treatment failure. ● Respiratory support should be available but fear of respiratory depression should not prevent adequate treatment. ● Persistent unresponsiveness after convulsions stop may represent nonconvulsive status. ● Correct hypoglycemia immediately. ● Eclampsia requires magnesium sulfate rather than routine status therapy alone. Botanical and Supplement Safety ● Do not place objects or oral remedies in the mouth. ● Avoid valerian, kava and sedative supplements during acute treatment. ● Do not use cannabidiol products as emergency rescue medication unless part of a prescribed protocol. ● Herbal anticonvulsants cannot replace benzodiazepines. Monitoring ● Seizure duration ● Airway and oxygenation ● Blood pressure Glucose Cardiac rhythm Temperature Recurrence EEG activity Medication adverse effects Single Best Next Step Give an adequate benzodiazepine dose immediately while supporting ventilation. Clinical Pearl Status epilepticus is treated at five minutes, not after the historical 30-minute definition. NPLEX Examination Trap Do not give several small ineffective benzodiazepine doses instead of one adequate dose. Disease Overview Status epilepticus is prolonged or recurrent seizure activity without adequate neurological recovery. Continued activity may become increasingly resistant to medication and cause systemic and neurological injury. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Convulsive Status Epilepticus.”

186

Acute Stanford Type A Aortic Dissection

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 58-year-old man with poorly controlled hypertension develops abrupt severe chest pain radiating between the shoulder blades. Examination and Investigations ● Blood pressure: 196/110 mmHg in the right arm ● Blood pressure: 164/92 mmHg in the left arm Heart rate: 112/min New early diastolic murmur Left radial pulse weaker than right ECG: Nonspecific ST–T abnormalities CT angiography: Dissection involving the ascending aorta

Question 1 of 1NPLEX-SYS-186

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute Stanford type A aortic dissection Differential Diagnosis Acute coronary syndrome Pulmonary embolism Pericarditis Cardiac tamponade Esophageal rupture Pneumothorax Musculoskeletal chest pain Aortic intramural hematoma Key Investigations CT angiography in a stable patient Transesophageal echocardiography when unstable or CT is unsuitable ECG Troponin CBC Creatinine Coagulation studies Type and crossmatch Bedside echocardiography for regurgitation or tamponade Conventional Management Continuous arterial and cardiac monitoring IV beta-blocker for anti-impulse therapy Add a titratable vasodilator if blood pressure remains elevated Provide opioid analgesia Immediate cardiothoracic-surgery transfer Surgical replacement or repair of the ascending aorta Treat tamponade, coronary malperfusion or organ ischemia as part of definitive management Relevant Safety Issues ● Do not anticoagulate or thrombolyse until dissection has been excluded in a concerning presentation. ● Do not give hydralazine or another vasodilator alone. ● Avoid excessive hypotension when organ malperfusion is present. ● A normal chest radiograph does not exclude dissection. ● Pulse deficits are helpful but not always present. Botanical and Supplement Safety Avoid stimulant products, ephedra and high-dose caffeine. Do not use garlic or nattokinase as vascular treatment. Avoid oral medication during possible emergency surgery. Supplements cannot stabilize the ascending aorta. Monitoring Heart rate Blood pressure Neurological findings Limb and renal perfusion Aortic regurgitation Tamponade Chest pain Postoperative complications Single Best Next Step Start IV beta-blockade and activate emergency surgical repair. Clinical Pearl Control heart rate before adding a vasodilator. NPLEX Examination Trap Do not administer thrombolysis for chest pain with pulse or blood-pressure asymmetry. Disease Overview Aortic dissection begins with separation of aortic-wall layers by blood entering through an intimal tear or intramural injury. Ascending involvement threatens the heart, coronary arteries and cerebral circulation. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Stanford Type A Aortic Dissection.”

187

Ruptured Abdominal Aortic Aneurysm

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 74-year-old man with a history of smoking suddenly develops severe abdominal and lower-back pain followed by collapse. Examination and Investigations Blood pressure: 68/40 mmHg Heart rate: 132/min Pale and diaphoretic Tender pulsatile abdominal mass Weak femoral pulses Bedside ultrasound: 8.4-cm abdominal aortic aneurysm Free intra-abdominal fluid suspected Mental status: Drowsy

Question 1 of 1NPLEX-SYS-187

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Ruptured abdominal aortic aneurysm with hemorrhagic shock Differential Diagnosis Aortic dissection Ruptured iliac aneurysm Renal colic Perforated viscus Mesenteric ischemia Acute pancreatitis Retroperitoneal hemorrhage from anticoagulation Myocardial infarction Key Investigations Investigations occur during surgical mobilization: Bedside aortic ultrasound CBC Type and crossmatch Coagulation studies Electrolytes and creatinine Blood gas and lactate ECG CT angiography only when hemodynamic stability permits without harmful delay Conventional Management Activate vascular surgery and massive-hemorrhage protocols. Establish large-bore or rapid-access IV lines. Provide balanced blood-component resuscitation. Avoid excessive crystalloid. Use permissive hypotension when appropriate until proximal control is obtained. Perform emergency EVAR or open repair. Correct hypothermia, acidosis and coagulopathy. Provide postoperative intensive care. Relevant Safety Issues Do not delay repair for complete laboratory results. Excessive crystalloid may worsen coagulopathy and abdominal-compartment pressure. A temporary improvement in blood pressure does not exclude rupture. Absence of a palpable mass does not rule out AAA in obesity. Consider rupture in an older patient with syncope and back pain. Botanical and Supplement Safety Stop anticoagulant supplements. Do not give oral products. Avoid herbal analgesics that delay transport. No botanical treatment can stop aneurysmal hemorrhage. Monitoring ● Perfusion and mental status ● Blood pressure ● Hemoglobin Lactate Coagulation Temperature Urine output Abdominal-compartment syndrome Limb perfusion after repair Single Best Next Step Proceed directly toward emergency vascular repair while resuscitating with blood products. Clinical Pearl The classic triad may be incomplete; unexplained shock with abdominal or back pain in an older adult should raise immediate concern. NPLEX Examination Trap Do not insist on CT confirmation in a profoundly unstable patient with diagnostic bedside findings. Disease Overview An AAA forms through progressive weakening and dilation of the abdominal aorta. Rupture causes massive retroperitoneal or intraperitoneal hemorrhage. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Ruptured Abdominal Aortic Aneurysm.”

188

Acute Limb Ischemia

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 69-year-old man with untreated atrial fibrillation develops sudden severe pain in the left leg. Examination ● Left leg pale and cold below the knee ● No palpable popliteal or pedal pulses ● Doppler arterial signal absent at the foot Reduced sensation in the toes Ankle movement preserved but weaker than the opposite side Right leg normal Symptom duration: Three hours

Question 1 of 1NPLEX-SYS-188

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute embolic lower-limb ischemia from atrial fibrillation Differential Diagnosis Severe chronic limb-threatening ischemia Deep-vein thrombosis Phlegmasia cerulea dolens Compartment syndrome Aortic dissection with branch occlusion Vasospasm Acute neuropathy Arterial trauma Key Investigations Treatment should not be delayed: Handheld Doppler examination CT angiography when it will guide intervention Duplex ultrasound in selected cases CBC Electrolytes and creatinine Coagulation studies Creatine kinase Blood gas and lactate ECG and cardiac evaluation Conventional Management Immediate IV unfractionated heparin unless contraindicated Keep the limb dependent or neutral and protect it from trauma Provide analgesia Emergency vascular consultation Surgical embolectomy, catheter-directed thrombolysis, thrombectomy or bypass according to limb status and anatomy ● Fasciotomy when reperfusion causes compartment syndrome ● Long-term treatment of atrial fibrillation or atherosclerotic disease Relevant Safety Issues Motor weakness suggests an immediately threatened limb. Do not elevate the ischemic leg above heart level. Do not apply direct heat to an insensate limb. Reperfusion can produce hyperkalemia, acidosis and compartment syndrome. A profoundly insensate and rigid limb may already be irreversible. Botanical and Supplement Safety Nattokinase is not a substitute for heparin. Do not massage or compress the limb. Avoid stimulant products and direct heating. Stop bleeding-promoting supplements before intervention when feasible. Monitoring Pain Motor and sensory function Doppler signals Limb temperature Creatine kinase Potassium Kidney function Compartment pressure after reperfusion Bleeding during anticoagulation Single Best Next Step Give IV heparin and activate emergency vascular revascularization care. Clinical Pearl Neurological deficit distinguishes a threatened limb from a merely viable ischemic limb. NPLEX Examination Trap Do not send a suddenly pulseless limb for routine outpatient testing. Disease Overview Acute limb ischemia is an abrupt reduction in arterial perfusion that threatens tissue viability. Irreversible muscle and nerve injury can develop within hours. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Limb Ischemia.”

189

Cardiac Tamponade

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 56-year-old woman with metastatic lung cancer presents with progressive dyspnea, chest pressure and near-syncope. Examination and Investigations Blood pressure: 76/48 mmHg Heart rate: 128/min Elevated jugular venous pressure Muffled heart sounds Pulsus paradoxus Cool extremities ECG: Low voltage with electrical alternans Bedside echocardiogram: ○ Large pericardial effusion ○ Right-atrial and right-ventricular diastolic collapse ○ Plethoric inferior vena cava

Question 1 of 1NPLEX-SYS-189

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Malignant pericardial effusion causing cardiac tamponade Differential Diagnosis Massive pulmonary embolism Tension pneumothorax Right-ventricular infarction Severe hypovolemia Constrictive pericarditis Aortic dissection Cardiogenic shock Superior vena cava obstruction Key Investigations ● Immediate bedside echocardiography ECG CBC Electrolytes and kidney function Coagulation studies Type and screen Chest imaging after stabilization Pericardial-fluid cytology, chemistry, microbiology and cell count according to cause Conventional Management Oxygen and monitoring Cautious IV fluid as a temporary bridge Vasopressor support where required Urgent ultrasound- or fluoroscopy-guided pericardiocentesis Surgical pericardial window for recurrent, loculated, traumatic or unsuitable effusions Drain placement and output monitoring Treatment of malignancy, infection or inflammatory disease Relevant Safety Issues ● Echocardiographic effusion alone does not equal tamponade; clinical hemodynamic compromise is central. ● Do not delay drainage for complete diagnostic testing. ● Avoid diuretics and preload-reducing medication. ● In traumatic hemopericardium or aortic dissection, surgical management may be preferred. ● Correct severe coagulopathy when possible without delaying life-saving drainage. Botanical and Supplement Safety Avoid diuretic herbs. Stop bleeding-promoting supplements when drainage is planned. Do not use hawthorn or stimulants to treat the tachycardia. Oral remedies have no role in obstructive shock. Monitoring Blood pressure Heart rate Jugular venous pressure Echocardiographic chamber collapse Drain output ● Reaccumulation ● Arrhythmia ● Procedure complications Single Best Next Step Drain the pericardial effusion urgently. Clinical Pearl In tamponade, tachycardia is compensatory and preload is essential. NPLEX Examination Trap Do not treat tamponade-associated edema or dyspnea with a diuretic before relieving the obstruction. Disease Overview Cardiac tamponade occurs when pericardial pressure restricts chamber filling. Reduced stroke volume produces compensatory tachycardia, elevated venous pressure and eventually obstructive shock. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Cardiac Tamponade.”

190

Spinal Epidural Abscess With Neurological Deficit

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 47-year-old man with poorly controlled diabetes and injection-drug use presents with worsening thoracic-back pain and fever. During the past day, he has developed leg weakness and difficulty urinating. Examination and Investigations ● Temperature: 39.0°C ● Heart rate: 120/min ● Localized thoracic-spine tenderness Bilateral leg weakness Hyperreflexia Reduced sensation below the umbilicus Distended bladder WBC: 18 × 10⁹/L CRP: Markedly elevated Blood cultures: Collected Plain radiograph: No acute abnormality

Question 1 of 1NPLEX-SYS-190

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Thoracic spinal epidural abscess causing acute spinal-cord compression Differential Diagnosis Metastatic spinal cord compression Vertebral osteomyelitis without abscess Epidural hematoma Transverse myelitis Disc herniation Cauda equina syndrome Tuberculous spinal infection Multiple myeloma Key Investigations Emergency MRI of the involved region, often with consideration of whole-spine imaging Blood cultures CBC CRP and ESR Electrolytes and kidney function Glucose HIV and infection-risk assessment Image-guided or operative cultures Bladder scan Echocardiography when bacteremia or endocarditis is suspected Conventional Management ● Immobilize and perform frequent neurological assessments. ● Begin empiric IV therapy covering Staphylococcus aureus, including MRSA, and appropriate gram-negative organisms. ● Obtain urgent neurosurgical or orthopedic-spine consultation. ● Decompress and drain when neurological deficit, instability, significant abscess burden or medical-treatment failure is present. ● Tailor antibiotics to culture results. ● Treat bacteremia, endocarditis and diabetes. ● Manage bladder dysfunction and rehabilitation needs. Relevant Safety Issues The complete triad of fever, back pain and neurological deficit may be absent early. Do not perform lumbar puncture through a potentially infected region. Do not delay MRI because the plain radiograph is normal. Neurological recovery worsens as the duration of compression increases. Steroids are not a substitute for infection control and decompression. Botanical and Supplement Safety Avoid spinal manipulation and deep massage. Herbal antimicrobials do not replace IV therapy. Avoid immunosuppressive products. Stop oral products before possible emergency surgery. Do not use topical heat over an undiagnosed spinal infection. Monitoring Motor strength Sensory level Bladder and bowel function Temperature CRP Blood cultures Kidney function MRI response when indicated Surgical complications Single Best Next Step Obtain emergency MRI and begin antibiotics with immediate spine-surgical involvement. Clinical Pearl Back pain plus fever plus any neurological or bladder symptom is a spinal epidural abscess until proven otherwise. NPLEX Examination Trap Do not allow a normal plain radiograph to exclude a spinal infection. Disease Overview A spinal epidural abscess is infection within the epidural space. Expansion, inflammatory edema and vascular compromise can rapidly injure the spinal cord or cauda equina. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Spinal Epidural Abscess With Neurological Deficit.”

191

Cauda Equina Syndrome

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 46-year-old man with chronic intermittent low-back pain develops severe bilateral sciatica after lifting a heavy object. During the next 12 hours, he notices numbness around the perineum and increasing difficulty initiating urination. Examination and Investigations Bilateral straight-leg raise reproduces radicular pain Reduced ankle reflexes Weakness of bilateral ankle plantar flexion Reduced perianal sensation Decreased anal tone Bladder scan after attempted voiding: 680 mL No fever No recent spinal procedure No known malignancy

Question 1 of 1NPLEX-SYS-191

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Cauda equina syndrome caused by a large lumbar disc herniation Differential Diagnosis ● Conus medullaris syndrome Spinal epidural abscess Spinal epidural hematoma Metastatic spinal compression Severe lumbar spinal stenosis Transverse myelitis Guillain–Barré syndrome Functional neurological disorder Key Investigations Emergency lumbar MRI Bladder scan Focused lower-limb neurological examination Perianal sensation and anal-tone assessment CBC and inflammatory markers when infection is possible Coagulation studies when epidural hematoma is possible CT myelography when MRI is unavailable or contraindicated Conventional Management Keep the patient NPO. Obtain urgent spinal-surgical consultation. Provide appropriate analgesia. Catheterize significant urinary retention. Perform emergency decompression when compressive cauda equina syndrome is confirmed. ● Treat infection, hemorrhage, tumour or another identified cause. ● Begin bladder, bowel and neurological rehabilitation after definitive treatment. Relevant Safety Issues ● Do not wait for complete urinary incontinence. ● Retention may initially present as loss of urinary sensation or difficulty starting the stream. ● A normal rectal examination does not independently exclude the diagnosis. ● Do not delay imaging while attempting prolonged conservative therapy. ● Document sensory, motor, bladder and bowel findings carefully. Botanical and Supplement Safety ● Do not perform chiropractic manipulation. ● Avoid sedating botanicals that obscure neurological progression. ● Do not use anti-inflammatory supplements as substitutes for MRI. ● Stop bleeding-promoting supplements if emergency surgery is likely. Single Best Next Step Obtain emergency MRI and activate spinal-surgical management. Clinical Pearl Saddle sensory change and new bladder dysfunction are more concerning than the severity of back pain. NPLEX Examination Trap Do not wait for a completely painless, overfilled bladder before suspecting cauda equina syndrome. Disease Overview Cauda equina syndrome results from compression of the lumbosacral nerve roots below the spinal cord. Large central disc herniation is a common cause, but tumour, infection, hemorrhage and trauma are also important. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Cauda Equina Syndrome.”

192

Giant Cell Arteritis With Threatened Vision

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 74-year-old woman presents with a new unilateral temporal headache, scalp tenderness and pain in the jaw while chewing. This morning, she experienced a five-minute episode of painless visual loss in the right eye. Examination and Investigations ● Right temporal artery: Tender and reduced pulsation ● Visual acuity: Currently preserved ● Relative afferent pupillary defect: Absent ESR: 92 mm/hour CRP: Markedly elevated Platelets: 548 × 10⁹/L Hemoglobin: 104 g/L No focal limb weakness History of bilateral shoulder stiffness for three months

Question 1 of 1NPLEX-SYS-192

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Giant cell arteritis with amaurosis fugax Differential Diagnosis Retinal embolism from carotid disease Nonarteritic anterior ischemic optic neuropathy Migraine with visual aura Acute angle closure Optic neuritis Intracranial mass Temporomandibular disorder Herpes zoster Key Investigations ESR and CRP CBC and platelets Liver enzymes Urgent ophthalmological examination Temporal-artery biopsy Vascular ultrasound where expertise exists Large-vessel imaging when extracranial involvement is suspected Temporal-artery biopsy should be arranged promptly and generally remains diagnostically useful after treatment has started. The ACR/Vasculitis Foundation guideline conditionally favours biopsy within two weeks of initiating glucocorticoids. Conventional Management Immediate IV pulse glucocorticoid for threatened vision Transition to high-dose oral glucocorticoid Urgent rheumatology and ophthalmology involvement Consider tocilizumab as a glucocorticoid-sparing treatment Assess for aortic and large-artery involvement Provide bone, gastric, infection and metabolic risk protection Monitor for relapse during tapering Relevant Safety Issues A normal ESR does not completely exclude GCA. Visual symptoms may be transient before permanent blindness. Bilateral blindness can occur rapidly. Monitor glucose, blood pressure, infection and osteoporosis during glucocorticoid treatment. ● Do not delay treatment for imaging or biopsy. Botanical and Supplement Safety ● Do not replace glucocorticoids with turmeric, boswellia or other anti-inflammatory supplements. ● Review calcium and vitamin D according to bone-risk assessment. ● Avoid unregulated adrenal or corticosteroid-like products. ● Review bleeding-promoting supplements if biopsy is planned. Single Best Next Step Begin immediate high-dose glucocorticoid treatment. Clinical Pearl Jaw claudication is highly suggestive of cranial arterial ischemia in GCA. NPLEX Examination Trap Do not wait for permanent visual loss before treating. Disease Overview Giant cell arteritis is granulomatous inflammation of medium and large arteries, primarily affecting adults older than 50. Ophthalmic-artery involvement can cause irreversible ischemic blindness. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Giant Cell Arteritis With Threatened Vision.”

193

Perforated Peptic Ulcer

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 61-year-old man taking naproxen for chronic knee pain develops sudden severe epigastric pain that rapidly becomes generalized. Examination and Investigations Blood pressure: 88/54 mmHg Heart rate: 124/min Respiratory rate: 28/min Temperature: 38.2°C Abdomen: Rigid with generalized rebound tenderness WBC: 18 × 10⁹/L Lactate: 4.8 mmol/L Creatinine: Elevated Upright chest radiograph: Free subdiaphragmatic air

Question 1 of 1NPLEX-SYS-193

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Perforated duodenal or gastric ulcer with secondary peritonitis and septic shock Differential Diagnosis Perforated diverticulitis Perforated appendicitis Ruptured abdominal aortic aneurysm Mesenteric ischemia Acute pancreatitis Perforated malignancy Spontaneous bacterial peritonitis Esophageal rupture Key Investigations Testing should not delay surgery: CBC Electrolytes and creatinine Lactate and blood gas Liver tests and lipase Coagulation studies Type and crossmatch Blood cultures CT abdomen when the diagnosis is uncertain and the patient is stable enough Conventional Management Keep the patient NPO. Establish large-bore IV access. Begin IV crystalloid with frequent reassessment. Administer broad-spectrum IV antibiotics. Give IV proton-pump inhibitor. Insert a nasogastric tube where indicated. Obtain immediate surgical consultation. Perform laparoscopic or open closure and peritoneal washout. Test and treat for Helicobacter pylori after stabilization. Stop NSAIDs when possible. Relevant Safety Issues Do not delay surgery for complete correction of shock. Reassess for abdominal-compartment physiology and organ failure. NSAIDs may cause ulceration without preceding dyspepsia. Free air may be absent in some perforations. Older adults may have less dramatic initial examination findings. Botanical and Supplement Safety Stop willow bark and other salicylate-containing products. Avoid oral supplements during peritonitis. Do not use licorice or herbal mucosal products as treatment for perforation. Review products that increase bleeding or kidney injury. Single Best Next Step Resuscitate and obtain emergency surgical source control. Clinical Pearl A rigid abdomen with sudden pain is a surgical emergency even before imaging is completed. NPLEX Examination Trap Do not send a patient with generalized peritonitis for routine outpatient endoscopy. Disease Overview A peptic ulcer can erode through the stomach or duodenal wall, releasing gastrointestinal contents into the peritoneal cavity and causing chemical followed by bacterial peritonitis. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Perforated Peptic Ulcer.”

194

Severe Acute Pancreatitis

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 48-year-old man presents with severe epigastric pain radiating to his back after heavy alcohol consumption. He has persistent vomiting and cannot tolerate fluids. Examination and Investigations Blood pressure: 86/52 mmHg Heart rate: 126/min Respiratory rate: 28/min Oxygen saturation: 91% Diffuse upper-abdominal tenderness Lipase: More than three times the upper limit of normal Hematocrit: 54% Creatinine: 186 µmol/L BUN: Rising Lactate: 3.8 mmol/L Chest radiograph: Small bilateral pleural effusions Ultrasound: No common-bile-duct dilation

Question 1 of 1NPLEX-SYS-194

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Severe acute alcohol-associated pancreatitis with hypovolemia and acute kidney injury Differential Diagnosis Perforated peptic ulcer Acute cholecystitis Acute cholangitis Mesenteric ischemia Inferior myocardial infarction Aortic dissection Bowel obstruction Alcoholic ketoacidosis Key Investigations CBC Electrolytes and creatinine BUN and hematocrit trends Liver enzymes and bilirubin Calcium Triglycerides Glucose Lactate and blood gas Right-upper-quadrant ultrasound CT only when diagnosis is uncertain or complications are suspected after the initial period Conventional Management IV lactated Ringer solution with frequent reassessment Oxygen and respiratory monitoring Opioid or other appropriate analgesia Antiemetic treatment Early enteral nutrition Correct electrolyte abnormalities Treat alcohol withdrawal risk ICU-level care for persistent organ failure Antibiotics only for confirmed or strongly suspected infection Drainage or debridement of infected necrosis using a delayed step-up approach when feasible The 2024 ACG guidance supports early feeding and discourages routine prophylactic antibiotics or urgent ERCP without cholangitis. Relevant Safety Issues Excessive fluid can worsen pulmonary edema and abdominal-compartment pressure. Under-resuscitation can worsen pancreatic and renal ischemia. A normal early CT does not exclude severe disease. Organ failure persisting beyond 48 hours defines severe pancreatitis. Monitor for alcohol withdrawal. Botanical and Supplement Safety ● Stop alcohol completely. ● Avoid oral herbs during persistent vomiting. ● Do not use pancreatic enzyme supplements for acute pancreatitis unless another indication exists. ● Avoid high-dose antioxidant or “detoxification” infusions. ● Review hypertriglyceridemia-promoting medications and supplements. Single Best Next Step Begin closely monitored IV crystalloid resuscitation. Clinical Pearl The early trend in BUN and organ function is more clinically useful than the height of the lipase level. NPLEX Examination Trap Do not prescribe prophylactic antibiotics solely because pancreatitis is severe. Disease Overview Acute pancreatitis is premature activation of digestive enzymes within the pancreas, producing local inflammation and potentially systemic capillary leak, organ failure and necrosis. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Severe Acute Pancreatitis.”

195

Acute Calculous Cholecystitis

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 57-year-old woman presents with 18 hours of constant right-upper-quadrant pain, fever and vomiting. Examination and Investigations Temperature: 38.4°C Heart rate: 108/min Right-upper-quadrant tenderness Inspiratory arrest during deep palpation WBC: 15.6 × 10⁹/L Bilirubin: Mildly elevated Lipase: Normal Ultrasound: Gallstones Gallbladder-wall thickening Pericholecystic fluid Positive sonographic Murphy sign Common bile duct not dilated

Question 1 of 1NPLEX-SYS-195

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Acute calculous cholecystitis Differential Diagnosis Biliary colic Acute cholangitis Gallstone pancreatitis Peptic-ulcer disease Hepatitis Liver abscess Right-lower-lobe pneumonia Acute coronary syndrome Key Investigations CBC Liver enzymes and bilirubin Lipase Electrolytes and creatinine Blood cultures when septic Right-upper-quadrant ultrasound HIDA scan when ultrasound is nondiagnostic MRCP or endoscopic ultrasound when ductal stones remain possible Conventional Management Keep the patient initially NPO. Give IV fluid. Provide analgesia and antiemetic treatment. Begin appropriate antibiotics. Perform early laparoscopic cholecystectomy. Use percutaneous cholecystostomy for selected critically ill patients who cannot undergo immediate surgery. ● Evaluate for ductal stone disease when bilirubin, ductal dilation or cholangitis suggests obstruction. Relevant Safety Issues A normal bilirubin does not exclude cholecystitis. Persistent pain lasting more than several hours differs from brief biliary colic. Gangrenous cholecystitis may occur with limited fever in older adults. Adjust antibiotics for kidney and liver function. Do not perform ERCP routinely without evidence of ductal disease. Botanical and Supplement Safety Avoid choleretic herbs during acute obstruction. Avoid high-fat meals. Do not use olive-oil “gallbladder flushes.” Avoid Chelidonium majus and unregulated liver products. Supplements do not dissolve an acutely obstructing gallstone. Single Best Next Step Begin hospital treatment and arrange early laparoscopic cholecystectomy. Clinical Pearl Biliary colic resolves; cholecystitis produces persistent pain and inflammation. NPLEX Examination Trap Do not order ERCP solely because gallstones are present. Disease Overview Acute calculous cholecystitis usually results from persistent cystic-duct obstruction by a gallstone, causing gallbladder distension, inflammation and possible secondary infection. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Calculous Cholecystitis.”

196

High-Risk Pulmonary Embolism With Shock

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 63-year-old man develops sudden dyspnea and syncope five days after major pelvic surgery. Examination and Investigations Blood pressure: 68/40 mmHg Heart rate: 138/min Respiratory rate: 34/min Oxygen saturation: 79% Jugular venous pressure elevated Lungs: Clear ECG: Sinus tachycardia with right-heart-strain pattern Bedside echocardiogram: Dilated hypokinetic right ventricle CT pulmonary angiography: Large bilateral pulmonary emboli No active surgical-site bleeding Hemoglobin: Stable

Question 1 of 1NPLEX-SYS-196

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis High-risk acute pulmonary embolism causing obstructive shock Differential Diagnosis Cardiac tamponade Tension pneumothorax Right-ventricular myocardial infarction Aortic dissection Massive aspiration Severe anaphylaxis Septic shock Acute right-heart failure from another cause Key Investigations Treatment and evaluation proceed together: ECG Continuous cardiac monitoring Blood gas and lactate Troponin and natriuretic peptide CBC Creatinine Coagulation studies Bedside echocardiography CT pulmonary angiography when sufficiently stable Compression ultrasound when chest imaging cannot be obtained safely Conventional Management Oxygen and airway support Careful IV fluid trial rather than indiscriminate volume loading Norepinephrine for shock IV unfractionated heparin when appropriate Systemic thrombolysis when benefits outweigh bleeding risk Catheter-directed thrombectomy or surgical embolectomy when thrombolysis is contraindicated or unsuccessful ● Extracorporeal support in selected refractory collapse ● Ongoing therapeutic anticoagulation after stabilization Relevant Safety Issues ● Recent surgery is a major bleeding consideration, not an automatic reason to accept fatal untreated shock. ● Avoid excessive positive-pressure ventilation, which may reduce venous return. ● Avoid large fluid loads that distend the failing right ventricle. ● Do not delay reperfusion for an isolated D-dimer. ● Cardiac arrest with suspected PE may require thrombolytic consideration during resuscitation. Botanical and Supplement Safety Nattokinase and herbal anticoagulants are not substitutes for reperfusion. Stop bleeding-promoting supplements. Do not massage a leg with suspected DVT. Avoid oral products during hemodynamic instability. Single Best Next Step Activate emergency reperfusion therapy for high-risk PE. Clinical Pearl Shock—not clot size on CT alone—defines high-risk pulmonary embolism. NPLEX Examination Trap Do not treat obstructive shock with anticoagulation alone while waiting for spontaneous clot resolution. Disease Overview Pulmonary embolism abruptly increases pulmonary vascular resistance. When the right ventricle cannot generate sufficient pressure, cardiac output falls and obstructive shock develops. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “High-Risk Pulmonary Embolism With Shock.”

197

Cerebral Injury During Pediatric DKA Treatment

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 10-year-old child with newly diagnosed type 1 diabetes is being treated for severe DKA. Four hours after treatment begins, the child develops worsening headache, vomiting and irritability. Examination and Investigations Heart rate decreased from 132/min to 86/min Blood pressure increased from 98/58 to 132/82 mmHg Oxygen saturation: 93% Increasing drowsiness New left sixth-cranial-nerve palsy Glucose: Falling gradually Sodium: Rising less than expected as glucose falls No recent sedative medication

Question 1 of 1NPLEX-SYS-197

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis DKA-associated cerebral injury Differential Diagnosis Hypoglycemia Hypokalemia Cerebral venous thrombosis Meningitis or encephalitis Ischemic stroke Hypernatremia Medication-associated sedation Severe cerebral hypoperfusion Key Investigations Treatment precedes imaging: Frequent neurological assessment Glucose Sodium and corrected sodium trend Potassium Blood gas Serum osmolality Fluid input and output CT or MRI after initial treatment when another diagnosis is possible Conventional Management Administer IV mannitol or 3% hypertonic saline immediately. Elevate the head of the bed. Reduce excess fluid administration. Maintain airway and oxygenation. Avoid hypotension. Continue carefully adjusted insulin and electrolyte treatment. Transfer to pediatric intensive care. Repeat hyperosmolar therapy if clinical response is inadequate under specialist guidance. Relevant Safety Issues Do not wait for papilledema. Cerebral injury may develop before or during treatment. Falling glucose is expected and does not explain focal cranial-nerve signs. Routinely adding bicarbonate is generally avoided. Repeated neurological examinations are essential throughout treatment. Botanical and Supplement Safety No botanical treatment is appropriate. Do not give oral electrolyte products. Avoid essential oils or stimulants intended to improve alertness. Supplements must not delay hyperosmolar therapy. Single Best Next Step Treat suspected cerebral injury immediately with mannitol or hypertonic saline. Clinical Pearl Imaging is not required before treating clinical cerebral injury in pediatric DKA. NPLEX Examination Trap Do not attribute worsening drowsiness to fatigue or sleep without assessing for cerebral injury. Disease Overview Cerebral injury is a rare but severe complication of pediatric DKA. Multiple factors, including inflammation, altered cerebral perfusion and osmotic shifts, may contribute. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Cerebral Injury During Pediatric DKA Treatment.”

198

Fever in an 18-Day-Old Infant

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

An 18-day-old term infant is brought to the emergency department after a rectal temperature of 38.2°C was measured at home. The infant appears comfortable and has fed normally. Examination Temperature in hospital: 37.8°C Heart rate: 154/min Respiratory rate: 38/min Oxygen saturation: 99% Alert and well perfused Anterior fontanelle: Soft No respiratory distress No focal infection Birth and maternal history unremarkable

Question 1 of 1NPLEX-SYS-198

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Fever in a neonate requiring exclusion of invasive bacterial infection Differential Diagnosis ● Urinary tract infection ● Bacteremia ● Bacterial meningitis Viral infection Neonatal herpes simplex infection Pneumonia Osteomyelitis Environmental overheating Key Investigations Blood culture CBC Procalcitonin and/or other inflammatory markers Catheterized or suprapubic urinalysis and urine culture Lumbar puncture for CSF cell count, glucose, protein, Gram stain, culture and appropriate molecular testing ● Viral testing when indicated ● Liver enzymes and HSV testing when herpes is possible Conventional Management Admit to hospital. Begin empiric parenteral antibiotics after cultures are collected. Use an age-appropriate regimen covering common neonatal pathogens. Add acyclovir when HSV risk factors or clinical features are present. Monitor cardiorespiratory status and feeding. Narrow or discontinue therapy according to cultures, molecular testing and clinical progress. Relevant Safety Issues Do not rely on temporal or axillary temperature alone when fever is uncertain. A well appearance does not exclude meningitis. Maternal history may be normal despite neonatal infection. Avoid ceftriaxone in many neonates because of bilirubin and calcium-related safety concerns. ● Do not delay antibiotics if lumbar puncture cannot be obtained promptly. Botanical and Supplement Safety Do not give honey, herbal drops or essential oils. Avoid oral products not specifically prescribed for neonates. Do not use fever herbs or tepid bathing to delay assessment. Ask about traditional products applied to the umbilical stump. Single Best Next Step Complete the neonatal sepsis evaluation, administer IV antibiotics and admit. Clinical Pearl A reliable fever measured at home counts even when the infant is afebrile in the emergency department. NPLEX Examination Trap Do not use the infant’s well appearance to avoid lumbar puncture and admission at 18 days of age. Disease Overview Young infants have immature immune responses and may develop bacteremia or meningitis with minimal localizing signs. Age strongly determines the intensity of fever evaluation. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Fever in an 18-Day-Old Infant.”

199

Acute Delirium From Medication and Urinary Retention

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

An 81-year-old man is brought to hospital because of sudden confusion and visual hallucinations. Two days earlier, he began taking diphenhydramine for insomnia. Examination and Investigations Alternates between agitation and drowsiness Unable to sustain attention Disoriented to time and place Dry mouth Dilated pupils Distended, tender lower abdomen Bladder scan: 860 mL Temperature: 37.1°C Glucose: Normal Sodium: 138 mmol/L Urinalysis: No pyuria No focal neurological deficit

Question 1 of 1NPLEX-SYS-199

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Anticholinergic delirium complicated by acute urinary retention Differential Diagnosis Urinary or respiratory infection Stroke Subdural hematoma Hypoglycemia Electrolyte disturbance Alcohol or sedative withdrawal Dementia with Lewy bodies Severe pain Fecal impaction Key Investigations 4AT or another validated delirium assessment Medication reconciliation Bladder scan Glucose CBC Electrolytes and kidney function Oxygen saturation Urinalysis and culture only when clinically indicated ECG CT head when trauma, focal findings or another neurological indication exists Conventional Management Stop the offending medication. Catheterize significant urinary retention. Treat pain, dehydration, hypoxia, constipation and infection. Reorient calmly and repeatedly. Provide hearing aids and glasses. Maintain normal day-night cues. Encourage safe mobilization. Use family support where appropriate. Reserve short-term antipsychotic treatment for severe distress or immediate danger after nonpharmacological measures fail. Relevant Safety Issues Hypoactive delirium is commonly missed. Antipsychotics can prolong QT and increase extrapyramidal, stroke and mortality risks. Benzodiazepines usually worsen nonwithdrawal delirium. Do not assume bacteriuria is the cause without symptoms or supporting evidence. Assess decision-making capacity for the specific decision at hand. Botanical and Supplement Safety Avoid diphenhydramine-containing “PM” products. Avoid anticholinergic botanical sleep combinations. Valerian, kava and cannabis may worsen sedation and falls. Do not combine multiple sleep remedies. Review all over-the-counter products brought from home. Single Best Next Step Withdraw the anticholinergic trigger and decompress the bladder. Clinical Pearl In delirium, treat the cause rather than the behaviour alone. NPLEX Examination Trap Do not diagnose new dementia during an acute fluctuating confusional state. Disease Overview Delirium is an acute disturbance of attention and cognition caused by physiological stress, medication effects or illness. Older adults may develop delirium from relatively minor insults. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Acute Delirium From Medication and Urinary Retention.”

200

Fulminant Clostridioides difficile Colitis

1 questions ·

GEA: Medical InterventionsSEA: Neurological, Trauma, Surgical & Infectious Emergencies

System-based clinical case

A 72-year-old woman develops profuse diarrhea after receiving clindamycin for a dental infection. Five days later, the diarrhea decreases, but she develops increasing abdominal distension and confusion. Examination and Investigations Temperature: 39.0°C Blood pressure: 78/46 mmHg Heart rate: 132/min Abdomen: Markedly distended and diffusely tender Bowel sounds: Minimal WBC: 34 × 10⁹/L Creatinine: 244 µmol/L Lactate: 5.6 mmol/L Stool toxin assay: Positive for C. difficile Abdominal radiograph: Transverse-colon dilation to 7.2 cm No free intraperitoneal air

Question 1 of 1NPLEX-SYS-200

What is the single best next step?

Next case

Answer, integrated rationale, safety review, and references

References

Open system review, differential diagnosis, investigations, treatment plan, safety notes, or NPLEX trap

Most Likely Diagnosis Fulminant Clostridioides difficile colitis with toxic megacolon and septic shock Differential Diagnosis Severe inflammatory bowel disease flare Ischemic colitis Toxic megacolon from another infection Mechanical large-bowel obstruction Ogilvie syndrome Perforated diverticulitis Mesenteric ischemia Medication-induced ileus Key Investigations CBC Electrolytes and creatinine Lactate and blood gas Albumin Coagulation studies Blood cultures ● Abdominal radiography ● CT abdomen when stable enough and when it will guide management ● Serial abdominal examinations Conventional Management Stop unnecessary precipitating antibiotics. Begin high-dose oral or nasogastric vancomycin. Give IV metronidazole. Add rectal vancomycin when significant ileus is present. Provide sepsis resuscitation. Correct electrolytes. Use contact precautions with soap-and-water hand hygiene. Obtain immediate colorectal-surgical consultation. Proceed to emergency surgery when medical treatment fails or the patient deteriorates. Relevant Safety Issues ● Reduced diarrhea can reflect ileus rather than improvement. ● Avoid loperamide and opioids when possible. ● Alcohol hand sanitizer does not reliably remove spores; soap-and-water handwashing is important. ● Avoid unnecessary proton-pump inhibitors and antibiotics. ● Do not delay surgical consultation until perforation occurs. Botanical and Supplement Safety ● Avoid probiotics during shock or profound critical illness unless specifically directed. ● Do not use Saccharomyces boulardii in severely immunocompromised or central-line patients without specialist assessment. ● Herbal antimicrobials do not treat fulminant CDI. ● Avoid bowel-stimulating or antimotility supplements. Single Best Next Step Begin fulminant CDI therapy and involve surgery immediately. Clinical Pearl Decreasing stool output in severe CDI may signal toxic ileus, not recovery. NPLEX Examination Trap Do not give an antimotility agent to a patient with suspected toxic megacolon. Disease Overview C. difficile produces toxins that damage colonic epithelium and provoke intense inflammation. Fulminant disease can progress to ileus, toxic megacolon, perforation, shock and multiorgan failure. Evidence and scope note This pretest case is designed for NPLEX Part II examination preparation. Diagnosis, treatment, referral, medication use, and adjunctive naturopathic care must be verified against current guidelines, patient-specific factors, jurisdictional scope, and local emergency pathways. Complementary care must not delay evidence-based emergency or specialist management.

Reference framework

NABNE. NPLEX Part II Clinical Science Examinations: Blueprint and Study Guide. August 2026 edition.
Merck Manual Professional Edition. Current clinical review for the condition and emergency presentation addressed in this case.
BMJ Best Practice or an equivalent current evidence-based clinical reference for diagnosis, investigations, treatment, monitoring, and referral.
Current emergency-medicine, trauma, surgical, neurological, or infectious-disease guideline relevant to the time-sensitive condition addressed.
Current specialty-society guideline and current authorized product monograph relevant to “Fulminant Clostridioides difficile Colitis.”

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