Investigation into the Reduction of Unnecessary RV Pacing in Pacemaker Patients with the VIP^TM; Algorithm

Abstract

Introduction: Several clinical studies demonstrated the importance of reducing unnecessary RV pacing in pacemaker patients. The purpose of this registry was to prospectively evaluate VIP^TM; (Ventricular Intrinsic Preference^TM) contribution to reducing RV pacing. Methods and Background: A total of 224 patients, 136 patients with normal AV conduction and 87 patients with AV block, received a pacemaker with VIP^TM; feature (VictoryDR, VictoryXLDR, ZephyrDR St. Jude Medical) at a total of 25 centers in Japan. The percentage of RV pacing in each patient was measured after the implantation for a baseline measurement with VIP^TM; off, then again with VIP^TM; on. A follow up (FU) with an RV pacing percentage evaluation with VIP^TM; on was performed at the first FU visit within 3 months (90 days) after implant. Results: The baseline RV pacing (%) with VIP^TM; off was measured in 113 patients at implant and FU evaluations were performed in 220 patients with VIP^TM; on. The mean baseline RV Pacing (%) in the patients was 90.16% and that during the FU was 30.52%. However, in the patients with normal AV conduction baseline was 87.90% and 13.02% during the FU. Conclusions: VIP^TM; offers a reduction of RV pacing (%). A further reduction in the RV pacing (%) was observed in those patients with normal AV conduction.