Methods The left ventricular ejection fraction (LVEF) ,end - diastolic volume (EDV) and end - systolic volume (ESV) in autologous rhythm were collected by the GSPECT before implantation of pacemaker ,and at follow-up (4.6-1. 5months) in 27 patients.

• 采用双探头门控单光子发射 计算机断层摄影系统(GSPECT)采集心肌显像资料；测定患者起搏器植入前及植入后随访时(随访期4.；6±1