美国每年发生心脏猝死达50万起以上,其中75～85％为反复发作的室性快速型心律失常(以下简称室速)。此类室速多起因于陈旧性心肌梗塞,亦可与冠状动脉疾患无关。虽然近年来内科治疗室性心律失常方面有所进展,但还有相当大一部分病例难以得到控制,其一年死亡率高达80％;而恰恰相反,上述病人经外科手术治疗后第一年存活率为80％。据有关社会保险部门统计,手术后五 In the United States, there are more than 500,000 cases of sudden cardiac death each year, of which 75 to 85% are recurrent ventricular tachyarrhythmia (hereinafter referred to as VT). Such ventricular tachycardia often due to old myocardial infarction, coronary artery disease can also be unrelated. Although there has been some progress in the medical treatment of ventricular arrhythmias in recent years, a significant proportion of cases are still difficult to control with a one-year mortality rate of up to 80%; on the contrary, the first-year survival rates of these patients after surgery 80%. According to the statistics of the social insurance department, five after surgery