Arab Board Internal Medicine Clinical Exam Practice Questions - Arab Board Internal Medicine Final Clinical And Oral Examination (ABHS) Exam

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An 82-year-old woman presents with recurrent lightheadedness and bradycardia. On inspection of the jugular venous pulse (JVP), you observe intermittent, large, abrupt positive venous pulsations ('cannon a waves'). Which underlying cardiac electrophysiological condition is most likely responsible?

Atrial fibrillation with rapid ventricular response Complete (third-degree) atrioventricular block Constrictive pericarditis Severe tricuspid regurgitation

Correct Answer:

Complete (third-degree) atrioventricular block

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