title: Intermittent left bundle branch block in the athletic heart syndrome.
abstract: A 30-year-old man with typical findings of the athletic heart syndrome is presented because of the unique feature of intermittent left bundle branch block. Observations during right atrial pacing and exercise support the concept of autonomic control of intraventricular conduction, both adrenergic and cholinergic.
mesh_terms: D000328:Adult; D001341:Autonomic Nervous System / Q000503:physiopathology*; D002037:Bundle-Branch Block / Q000209:etiology*; D006332:Cardiomegaly / Q000209:etiology*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D013178:Sports Medicine; D013577:Syndrome