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Cardioinhibitory response recorded on telemetry in a patient with neurally mediated syncope. Progressive slowing of sinus rate and first-degree atrioventricular (AV) block (panel (A)), and two episodes of second-degree AV block (panels (B,C)). The association of sinus bradycardia and different types of AV block is highly suggestive for a vagal mechanism for syncope.
