Objective To assess the effect of QRS duration (QRSd) and cardiac function during right ventricular apex(RVA) pacing,rig目的比较右室心尖部(RVA)、右室流出道(RVOT)和右室双部位(RV-Bi)起搏的QRS宽度和对心功能的影响。
The general changes of vectorcardiograms were: the spatial axis of the QRS loop shifted towards the right posterior supe心电向量图总的变化是QRS空间综合向量向右、后、上方偏移,T向量向左、后,下方偏移;