Unstable supraventricular tachycardia — RCPSC EM MCQ
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Correct answer: A — Perform synchronized electrical cardioversion now while providing resuscitative support
Explanation lettering: D = shown as B · E = shown as C · B = shown as D · C = shown as E
A is correct because shock, pulmonary edema and ischemia make immediate synchronized cardioversion necessary despite uncertain duration. B can worsen hypotension. C delays definitive treatment. D has slow onset and does not address instability. E lets thromboembolic assessment delay life-saving stabilization.
Reference: CAEP Acute Atrial Fibrillation/Flutter Best Practices Checklist: https://www.caep.ca/clinical-practice-guidelines/caep-acute-atrial-fibrillation%2Fflutter-best-practices-checklist