Calcium channel blocker overdose — RCPSC EM MCQ
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Correct answer: E — Give IV sodium bicarbonate boluses with serial ECG and electrolyte reassessment
Explanation lettering: E = shown as A · C = shown as B · D = shown as C · A = shown as D · B = shown as E
B is correct for drug-induced sodium-channel blockade. C is hazardous with conduction delay. D adds sodium-channel and QT effects without correcting toxicity. E has no role and can provoke seizures. A targets a different poisoning mechanism.
Reference: Ontario Poison Centre, Drug-induced QRS widening treatment: https://www.ontariopoisoncentre.ca/siteassets/pdfs/english/patient-care-resources-documents/faxable-sheet_drug-induced-qrs-widening-treatment.pdf