REASONS FOR REPROGRAMMING DUAL-CHAMBER PACEMAKERS TO VVI-MODE - A RETROSPECTIVE REVIEW USING A COMPUTER DATABASE

Seven hundred seventy-one dual chamber pacemakers implanted over a 13- year period were identified using a computer database. The mean follow -up period was 40.4 +/- 30.9 months(mean +/- SD). Thirty-three (4.3%) patients were reprogrammed to the VVI mode after a mean period of 26.4 +/- 29 months. indications for pacing in those reprogrammed were: com plete heart block 45.7%, impaired AV conduction 5.7%, sick sinus syndr ome 34.2%, carotid sinus syndrome 11.4%, and vasovagal syndrome 2.8%. The most common reason for reprogramming was development of sustained atrial arrhythmias (atrial fibrillation or flutter), which occurred in 25 patients (3.3% of entire group). The remaining 8 (1% of entire gro up) were reprogrammed because of atrial lead related problems.