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Calcium channel blocker overdose — RCPSC EM MCQ

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HardToxicologyCalcium channel blocker overdoseRCPSC EM

A 58-year-old ingests sustained-release verapamil. BP is 68/38 mmHg, HR 38/min, glucose is 14 mmol/L, and lactate is 5.0 mmol/L despite fluids and atropine. ECG shows junctional bradycardia. What is the most likely diagnosis?

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Correct answer: C — Calcium channel blocker overdose

Calcium channel blocker overdose is correct: the clues indicate Calcium channel blocker overdose and this option addresses the immediate ED priority. The distractors delay care, target a less likely problem, or are unsafe in this physiology.

Reference: Goldfrank's Toxicologic Emergencies; Canadian poison centre practice