CONSIDERATION ABOUT THE INFLUENCE OF VARIABILITY OF THE PACED QRS WAVE DURATION CAUSED BY RIGHT VENTRICULAR APEX PACING AND SEPTAL PACING IN THE CLINICAL SITUATION
M. Tanaka, K. Su, M. Oi, Y. Motohashi, K. Takahashi, E. Ko, K. Hanazawa, M. Toyofuku, M. Kitada, Y. Yutsuki, T. Tamura
Department of Cardiology, Japanese Red Cross Wakayama Medical Center, Wakayama, Japan
Introduction: The aim of this study was to assess effects of change of the pQRS wave duration(pQRSWD) caused by right ventricular septal(RVS) pacing and right ventricular apex(RVA) pacing.
Methods: 305 consecutive new patients with a RV electrode during the period from January 2004 to December 2012 were studied retrospectively.
Results: Mean age was 76.5 years and 150 were men. Mean follow-up was 4.3 years. 145 patients received RVA pacing and 160 received RVS pacing. Although the mean pQRSWD caused by RVS pacing with 80% as the percentage of ventricular pacing(%VP) was significantly shorter than that caused by RVA pacing at PM implantation (149.2ms vs. 155.3ms, p=0.038), the difference disappeared during the follow-up periods. The rate of change of the pQRSWD caused by RVS pacing tended to be higher than that caused by RVA pacing (2.46% vs. 1.12%, p=0.07). Only RV mid septum pacing brought a low rate of change of the pQRSWD (-0.20%). The rate of change of the pQRSWD with heart failure hospitalization and cardiovascular events was significantly higher than that in patients without them (3.28% vs. 1.72%, p=0.044).
Conclusions: There is a possibility that change of the pQRSWD is related to a prognosis in patients with RV pacing.
