title: Complete AV block developing in a patient with manifest ventricular preexcitation.
abstract: This case report describes a 37-year-old man with manifest atriofascicular and fasciculoventricular connections who developed complete atrioventricular block. After resumption of 1:1 atrioventricular conduction, an electrophysiological study was conducted. During sinus rhythm, manifest ventricular preexcitation was observed and the AH and HV intervals were 80 msec and 50 msec, respectively. No change in AH interval during constant atrial pacing was observed by bolus injection of 20 mg of adenosine triphosphate. No changes in the morphology of the delta wave or HV interval were observed by changing the atrial pacing site. This patient developed HV block by atrial extrastimulus (S1S1: 600 msec, S1S2 <or= 350 msec). Thus, the patient was diagnosed as having combined atriofascicular and fasciculoventricular connections.
authors.affiliation: Division of Cardiovascular Medicine, Department of Medicine, Nihon University School of Medicine, Tokyo 173-8610, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Takagi
authors.forename: Ichiro
authors.initials: I
authors.lastname: Watanabe
authors.forename: Riko
authors.initials: R
authors.lastname: Masaki
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Okumura
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yamada
authors.forename: Rie
authors.initials: R
authors.lastname: Wakita
authors.forename: Kazunori
authors.initials: K
authors.lastname: Kawauchi
authors.forename: Kimie
authors.initials: K
authors.lastname: Ohkubo
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kofune
authors.forename: Hidezou
authors.initials: H
authors.lastname: Sugimura
authors.forename: Toshiko
authors.initials: T
authors.lastname: Nakai
authors.forename: Yukio
authors.initials: Y
authors.lastname: Ozawa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Saito
mesh_terms: D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D004594:Electrophysiology; D006327:Heart Block / Q000209:etiology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D011226:Pre-Excitation Syndromes / Q000503:physiopathology*