THE DEVELOPMENT OF SINOATRIAL DYSFUNCTION IN PACEMAKER PATIENTS WITH ISOLATED ATRIOVENTRICULAR-BLOCK

Citation
A. Morsi et al., THE DEVELOPMENT OF SINOATRIAL DYSFUNCTION IN PACEMAKER PATIENTS WITH ISOLATED ATRIOVENTRICULAR-BLOCK, PACE, 21(7), 1998, pp. 1430-1434
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Cardiac & Cardiovascular System","Engineering, Biomedical
Journal title
PACE-PACING AND CLINICAL ELECTROPHYSIOLOGY
ISSN journal
0147-8389 → ACNP
Volume
21
Issue
7
Year of publication
1998
Pages
1430 - 1434
Database
ISI
SICI code
0147-8389(1998)21:7<1430:TDOSDI>2.0.ZU;2-T
Abstract
The purpose of this paper is the assessment of sinus node competence o ver time in patients with isolated atrioventricular block (AV block). Patients implanted with AV synchronous pacemakers for isolated AV bloc k between December 1993 and June 1995 were prospectively evaluated at predischarge, 6 weeks, and subsequent 6 months follow-up with respect to atrial rate monitors/24-hour Holter and modified exercise test. Pat ients unable to maintain AV synchronous pacing or complete a modified exercise test were excluded. Sinus node competency is interpreted as: (1) absence of atrial brady- or tachyarrhythmia, (2) ability to achiev e a minimum heart rate of 100 beats/min with modified exercise test or during daily activities. There were 58 patients (22 women), mean age 71.0 +/- 13.8 with an average follow-up of 30.4 months (11-40). Three patients did not complete a modified exercise test, 4 patients were lo st to follow-up, and 2 patients were unable to maintain AV synchronous pacing. Of the remaining 49 patients, 3 developed chronic or paroxysm al atrial fibrillation. No patient developed significant bradyarrhythm ias. All patients achieved a heart rate of greater than or equal to 10 0 beats/min modified exercise test. In our group of patients with isol ated AV block within a moderate follow-up period, development of sinoa trial dysfunction was rare (6%). A longer follow-up is required to del ineate the natural history of sinoatrial dysfunction in patients with isolated AV block.