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Reflex vs Cardiac Syncope Features — EECC MCQ

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EasyGeneral CardiologyReflex vs Cardiac Syncope FeaturesEECC

A 55-year-old man presents with syncope while standing in church. He has a brief prodrome (feeling warm, nauseous, vision greying) before losing consciousness for ~10 seconds. He recovers fully within 1 minute with no confusion. His ECG, echocardiogram, and lying/standing BP are normal. What features suggest a benign (reflex) rather than cardiac cause?

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Correct answer: D — Positional trigger, recognisable prodrome, brief LOC (<1 minute), rapid recovery without confusion, and normal cardiac assessment — these features strongly suggest vasovagal syncope and further cardiac investigation is generally not needed

The ESC 2018 Syncope Guidelines use clinical features to distinguish reflex (benign) from cardiac syncope: REFLEX features: prodrome (warmth, nausea, diaphoresis, visual greying), positional trigger (prolonged standing, hot environment, emotional distress), brief LOC (<1 min), rapid and complete recovery, no post-ictal confusion. CARDIAC features: syncope during exertion, syncope in supine position, preceded by palpitations, no prodrome (abrupt onset), family history of SCD, structural heart disease, abnormal ECG. A classic history of reflex syncope with identifiable triggers in the setting of normal cardiac assessment (ECG, echo) has >95% diagnostic accuracy — further investigation (tilt test, ILR) is generally not needed. Tilt testing is reserved for atypical presentations or when the diagnosis is uncertain.

Reference: ESC (2018): Syncope Guidelines