Abstract
A single pass ventricular lead with a dual chamber electrode system was implanted in 17 patients (7 men, 10 women; aged 48 to 89 years, mean 76.6; bight 130 to 172cm, mean 152.1; weight 30 to 75Kg, mean 50.2) for symptomatic second- or third-degree AV block and normal sinus node function. Lead insertion and pacemaker implantation was as easy as VVI system. P wave amplitude at implant was 2.2±1.2mV and QRS wave amplitude was too small to measure from atrial electrodes. Postoperative complications included a pneumothrax and a pocket hematoma. One patient failed to utilize VDD mode due to lead displacement six months postoperatively. Other sixteen patients have been noticed no remarkable trouble on VDD mode. They improved their activity (NYHA functional class) significantly (P<0.01) and their preoperative CTR (58.7±6.8%) significantly (P<0.01) decreased to 53.4±7.7%. Under coventional VVI technique, single-lead VDD system can achieve physiological pacing and the patients enjoy good quality_of life very much. However, eight patients were noticed overcurving lead and careful observation is needed.
