Vasovagal syncope — MCCQE Part 1 MCQ

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ModerateSyncopeVasovagal syncopeMCCQE Part 1

A 20-year-old student faints during a blood draw after feeling warm and nauseated, recovers rapidly supine and has a normal ECG. Which of the following is the most likely diagnosis?

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Reveal the answer and explanation

Correct answer: A — Vasovagal syncope

Vasovagal syncope is the single best answer because the age, timing, examination findings and investigations in the vignette fit Vasovagal syncope better than the alternatives. The most tempting distractor is less appropriate because it either treats a neighbouring presentation, delays a time-critical intervention, or ignores a key discriminator in the stem. The remaining options are suboptimal because they would miss the diagnosis, use an investigation or treatment in the wrong sequence, or fail to address safety and follow-up. Canadian practice should be anchored to CCS syncope guidance, with attention to acuity, safety-netting and local provincial pathways.

Reference: CCS syncope guidance