Feasibility of concomitant implantation of permanent transvenous pacemaker and defibrillator systems.

In 17 patients (14 men and 3 women aged 69 +/- 10 years), a transvenous pacemaker was implanted before (8 patients), following (7 patients), or simultaneously (2 patients) with the insertion of a transvenous defibrillator. Indications included malignant ventricular arrhythmias and symptomatic bradycardia in all patients. All patients had structural heart disease. All pacemakers were non-programmable bipolar, either single chamber (n = 7) or dual chamber (n = 10). Eleven pacemakers were rate responsive. The Transvene system was implanted in 7 patients (Pacer-Cardioverter-Defibrillator in 6 patients and the Cadence defibrillator in 1). The Endotak lead system was implanted in 10 patients (Ventak in 7 patients and the Cadence in 3). The mean defibrillation threshold was 16 +/- 5 J. Repositioning of the pacemaker leads eliminated undersensing of ventricular fibrillation by the defibrillator, which occurred during asynchronous pacing in 2 patients. During a mean follow-up of 11 +/- 6 months, 2 patients died because of pump failure and 7 patients received defibrillator therapy for ventricular arrhythmias. No significant complications were noted. Successful concomitant implantation of transvenous pacemakers and defibrillators was thus accomplished in 17 patients, which suggests that insertion of a second transvenous device can be safely accomplished.