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Vasovagal Syncope — RACP Adult Medicine MCQ

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EasyCardiologyVasovagal SyncopeRACP Adult Medicine

A 22-year-old woman faints during a blood draw. She reports feeling warm, nauseated, and lightheaded before losing consciousness. She was pale and diaphoretic. She recovered fully within 1 minute without confusion. ECG and lying/standing BP are normal. What is the most likely cause of syncope?

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Correct answer: A — Vasovagal syncope

Classic vasovagal syncope: identifiable trigger (venepuncture), prodromal symptoms (warmth, nausea, diaphoresis, pallor), brief LOC with rapid recovery, and no post-ictal features. This is the commonest cause of syncope in young people. It is mediated by inappropriate vagal activation. Tilt table testing can confirm the diagnosis in recurrent cases.

Reference: ESC – 2018 – Syncope Guidelines