PERMANENT PACING FOLLOWING CARDIAC TRANSPLANTATION

Permanent pacemakers were inserted in 20 of 439 patients who had received 453 orthotopic cardiac allografts since 1980 at the Columbia-Presbyterian Medical Center. Mean age at transplantation was 45 +/- 4 (SEM) years (range 10 to 64). Pacemakers were inserted an average of 2.4 +/- 1 months after transplantation (range 0.4 to 29), 16 of 20 (80 %) within the first month. Indications included sinus bradycardia or sinus arrest in 15 (75%), third-degree heart block in 2 (10%), and both sinus node and atrioventricular node dysfunction in 3 (15%). Rejection episodes and pacemaker insertion were associated in 8 patients (40%). Pacing modes included DDD (7 patients, 35%), AAI,R (7 patients, 35%), VVI,R (3 patients, 15%), DDD,R (2 patients, 10%), and VVI (1 patient, 5%). There was no pacing-related morbidity or mortality. Fourteen of 20 patients (70%) are alive and well 3 to 48 months (mean 24 +/- 4) after transplantation. Late follow-up indicated that atrioventricular node dysfunction resolved in one of two patients, sinoatrial node dysfunction improved or resolved in 7/13 patients, and no atrioventricular block developed in 11 (8 to 37 months, mean 22 +/- 3). Permanent pacing can be safely performed following orthotopic cardiac transplantation, predominantly for sinus node dysfunction. The requirement for pacing may reflect ongoing or new onset rejection and patients should therefore be evaluated accordingly. Dual-chamber pacing is probably not necessary unless atrioventricular node dysfunction is coexistent. Further, as most transplant recipients return to an active life-style, AAI,R may be the preferred mode of pacing.