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Delirium from medical illness — RCPSC EM MCQ

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HardPsychiatric emergenciesDelirium from medical illnessRCPSC EM

CTAS 2. An 82-year-old from long-term care is suddenly agitated and hallucinating. Attention fluctuates, temp is 38.6°C, HR 116, and urinalysis suggests infection. Family reports she was cognitively intact last week. What is the most likely diagnosis?

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Correct answer: D — Delirium due to acute medical illness

Acute fluctuating inattention with fever and infection signs is delirium until proven otherwise, not a primary psychiatric disorder.

Reference: Canadian Coalition for Seniors' Mental Health delirium guideline