Abnormal His-Purkinje System Conduction Leading to Complete Atrioventricular Block in Patients With Hypertrophic Cardiomyopathy: A Report of 3 Cases

This case report describes three hypertrophic cardiomyopathy patients with abnormal His-Purkinje conduction and complete atrioventricular block with attacks of syncope and cardiopulmonary arrest. Although arrhythmias are common in hypertrophic cardiomyo-pathy, complete atrioventricular block is very rare. Prolonged QRS duration and abnormal His-Purkinje system conduction may result in complete atrioventricular block.