Complete AV block developing in a patient with manifest ventricular preexcitation.
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.
Takagi
Yasuhiro
Y
Division of Cardiovascular Medicine, Department of Medicine, Nihon University School of Medicine, Tokyo 173-8610, Japan.
Watanabe
Ichiro
I
Masaki
Riko
R
Okumura
Yasuo
Y
Yamada
Takeshi
T
Wakita
Rie
R
Kawauchi
Kazunori
K
Ohkubo
Kimie
K
Kofune
Tatsuya
T
Sugimura
Hidezou
H
Nakai
Toshiko
T
Ozawa
Yukio
Y
Saito
Satoshi
S
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*