title: [Paradoxical atrioventricular block within the bundle of His].
abstract: We have been able to record an atrio-ventricular block dependent upon bradycardia, but also no tachycardia, in a patient of 76 who presented with syncopal attacks. The basal electrocardiogram showed no significant delay in atrio-ventricular or intraventricular conduction. Intracavitary electrophysiological investigation allowed us to localise the site of this block in the main trunk of the bundle of His; we also established, under basal conduction conditions, a first degree block with an exactly similar relationship to the duration of the preceding diastole.
mesh_terms: D000368:Aged; D001919:Bradycardia / Q000150:complications; D002036:Bundle of His; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology; D006329:Heart Conduction System; D006801:Humans; D011859:Radiography; D013610:Tachycardia / Q000150:complications
vernacular_title: Bloc auriculo-venticulaire paradoxal intrahisien.