Figure-2: ①Pacing rate was adjusted from 60 to 55 times / min,and MVP on. ②MVP on and Beta-blocker dose increase. EGM 1:Atip to Aring;EGM 2:Can to RV coil;EGM 3: RVtip to RVring. (AP: atrial pace; PVC: premature ventricular contraction;VP:ventricular pace;VS:ventricular sense;VSP:ventricular safe pace;VS1:ventricular sense of ventricular activation transmitted through the atrioventricular node;VS2: ventricular sense of PVC originated from the scar zone of posterior inferior left ventricle)