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结扎家免冠状动脉左室支的不同部位，观察QRS起始部、中部、终末部高频成分的变化，结果显示：缺血面积小于35％时，整个QRS波高频成分随缺血范围的增大而增加；缺血面积大于35％时，QRS波起始部、中部的高频成分减少。
Ligation of home-coronary artery left ventricular different parts of the QRS start, central, terminal high frequency changes in the results showed that: the ischemic area is less than 35%, the entire high-frequency components of QRS wave with the ischemic range Of the ischemic area is greater than 35%, the beginning of the QRS wave, the central high-frequency components decreased.