![]() ![]() One patient with VT did not take prescribed antiarrhythmic therapy, another patient with VT died suddenly the remaining patient had a normal study and basilar migraines were subsequently diagnosed. During a mean follow-up period of 19 months (range 3 to 60 months) all but three patients have been free of syncope. ![]() Four of six patients with an HV interval ≥70 msec or pacing-induced infranodal block were treated with permanent pacemakers, four of four patients with VT received antiarrhythmic therapy, and three of four patients with nondiagnostic studies received no therapy (one patient received a permanent pacemaker). EPS demonstrated inducible ventricular tachycardia (VT) in four patients, an HV interval ≥70 msec in four, intra- and infra-His block with atrial pacing in one, and was nondiagnostic in four patients. Holter monitoring and neurologic evaluation were nondiagnostic in all patients prior to EPS. ![]() Six patients had coronary artery disease, three had cardiomyopathy, and four showed no evidence of organic heart disease. Thirteen patients with syncope and bifascicular block were evaluated by electrophysiologic study (EPS) including programmed stimulation.
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