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Carbon monoxide poisoning — ABEM Board MCQ

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ModerateToxicologyCarbon monoxide poisoningABEM Board

A family of four arrives as triage level 2 with headache, dizziness, nausea, and confusion after using a generator indoors. Pulse oximetry reads 99% in each patient, and one adult is pregnant. Which of the following is the most likely diagnosis?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: E — Carbon monoxide poisoning

Multiple patients from the same enclosed environment with neurologic symptoms and normal pulse oximetry suggest carbon monoxide poisoning because standard pulse oximetry is misleading.

Reference: ACEP Clinical Policy: Carbon Monoxide Poisoning; CDC carbon monoxide guidance