POLYMYOSITIS is said rarely to involve the myocardium. Only two pathologically documented cases of polymyositis with myocardial involvement have been reported, and conduction disorders were noted in neither.1,2 In the case presented below polymyositis was proved to involve the conduction system, with the initial appearance of atrioventricular block and, eventually, persistent ventricular asystole. Case Report W.C., a 26-year-old man, began to experience difficulty in climbing stairs 10 years before his terminal admission. The weakness progressed, and 3 years later, at the time of the 1st admission, there was mild diffuse proximal weakness. General physical examination and the remainder of the.
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