自超声心电图问世并广泛应用后,心电图诊断左、右心室扩张与肥厚的作用顿失光彩,因超声心动图能测量心室腔大小,直观解剖形态的改变等。但晚近,著名心电学者ME.Josephson提出心衰患者伴左束支阻滞时,当患者同时存在右室扩张或心功能障碍时可能出现三个心电图表现,已引起学术界极大兴趣。[定义]心衰伴左束支阻滞的发生率并非少见,近年的资料表明,伴左束支阻滞的心衰患者对双室再同步化治疗有良好反应,并成为心衰患者进行CRT Since the advent of echocardiography and the widespread use of electrocardiogram diagnosis of left and right ventricular dilatation and hypertrophy lost their lives, because of echocardiography can measure ventricular cavity size, visual anatomical changes. But recently, the famous cardiologist ME.Josephson proposed heart failure patients with left bundle branch block, when patients with right ventricular dilatation or cardiac dysfunction may appear three ECG performance, has aroused great interest in academia. [Definition] The incidence of heart failure with left bundle branch block is not uncommon. In recent years, data indicate that patients with heart failure with left bundle branch block have a good response to double-chamber resynchronization therapy and are candidates for CRT