title: Single lead atrial synchronous ventricular pacing in Japanese patients with complete atrioventricular block.
abstract: The purpose of this study was to review our experience with atrial synchronous ventricular pacing devices (THERA VDD pacing systems, Medtronic, Inc., U.S.A.) using single atrioventricular leads in Japanese patients with complete atrioventricular block and normal sinus function. Twenty patients with a mean age of 55 +/- 13 years underwent implantation of VDD pacemakers. At implantation the amplitude of atrial signals in the supine position during normal breathing, which was measured directly using an external pacing system analyzer, ranged from 1.8 to 5.8 mV with a mean amplitude of 3.4 +/- 1.4 mV. Atrial amplitudes did not change during deep breathing (3.3 +/- 1.1 mV) or in the semi-Fowler position (3.4 +/- 1.6 mV). Atrial oversensing or undersensing was not observed in any of the patients. During a follow-up period, the percentage of atrial synchronization was >95% in 19 patients, and none of the patients had pacemaker related tachycardia or pacemaker related complications. These results were promising enough to warrant the extension of the clinical use of the VDD pacemaker.
authors.affiliation: Department of Cardiac Surgery, Kinki University Hospital, Osaka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Otaki
authors.forename: T
authors.initials: T
authors.lastname: Inoue
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.forename: M
authors.initials: M
authors.lastname: Ueda
authors.forename: H
authors.initials: H
authors.lastname: Kitayama
authors.forename: S
authors.initials: S
authors.lastname: Nakamoto
authors.forename: N
authors.initials: N
authors.lastname: Wakaki
authors.forename: T
authors.initials: T
authors.lastname: Saga
authors.forename: H
authors.initials: H
authors.lastname: Oka
authors.forename: H
authors.initials: H
authors.lastname: Oku
mesh_terms: D000328:Adult; D000368:Aged; D002304:Cardiac Pacing, Artificial; D005260:Female; D005500:Follow-Up Studies; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D016683:Supine Position; D016896:Treatment Outcome