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采用信号叠加心电图（SA－ECG）检测急性心梗（AMI）伴室速（VT）、室颤（Vf）患者QRS起始部电活动异常。对40例正常人、33例AMI伴VT、Vf及49例AMI无VT者X、Y、Z复会导程的QRS起始部至其后60ms逐段分析。结果3组间起始部振幅有意义（P＜0．01）地减少出现在3O、40ms处、前门壁、前壁AMI组30、40ms处振幅减少与VT、Vf有相关意义（P＜0．01），而下壁AMI则无。SA－ECG起始部逐段分析对VT、Vf的敏感性和特异性均较心室晚电位（LP）阳性高。
The electrical activity of QRS origin in patients with acute myocardial infarction (AMI) accompanied by ventricular tachycardia (VT) and ventricular fibrillation (Vf) was detected by signal superimposed electrocardiography (SA-ECG) Forty normal subjects, 33 patients with AMI with VT, Vf and 49 with AMI without VT were recruited to QRS beginning of X, Y, Results There was a significant (P <0.01) amplitude decrease in the initial amplitude at 3O and 40 ms between the three groups, and a decrease in amplitude at 30 and 40 ms in the anterior and anterior wall AMI groups was associated with VT and Vf (P <0 .01), but no AMI in the inferior wall. The sensitivity and specificity of VT-Vf were higher than those of ventricular late potentials (LP) at the beginning of SA-ECG.