摘要
应用ART-EPX1200型心室晚电位仪对18例陈旧性心肌梗塞伴有室速和(或)室颤(VT、VF)者,32例不伴有VT、VF者和30例正常人进行快速傅利叶转换分析。结果显示,频域分析的理想节段为25Hz高通滤波低于40μV处往后延续120ms的节段(S_8),30～60Hz高频段优于60～120Hz。用基础分析节段(S_1)校正后的高频面积百分比(PHFc)较校正前为好,识别心梗后VT、VF者的最佳指标为S_3节段30～60Hz频段的PHFc,以其≥5.5％为异常,敏感性83％,特异性94％。
Eighteen post-myocardial infarction patients with sustained ventricular tachycardia and/or fibrillation (VT/VF), 32 control patients without VT/VF and 30 healthy subjects were studied in the frequency domain with fast-Fourier transform by ART-EPX 1200. Results of frequency domain analysis demonstrated that the optimal analyzed segment was one of 120ms duration starting from less than 40μ.V at 25 Hz high-pass filtering up to the ST-segment (S3). The frequency band of 30-60 Hz was superior to that of 60-120Hz. Percent high frequency area ratios which were corrected with the fundamental segment (S1) was better than uncorrected ones. The best parameter to discriminate post-myocardial patients with VT/VF was PHFc of 30-60Hz frequency band in S3, yielding 83% sensitivity and 94% specificity.
出处
《天津医药》
CAS
1994年第5期266-269,共4页
Tianjin Medical Journal
关键词
心电图
频域分析
心肌梗塞
signal-averaged ECG frequency domain analysis myocardial infarction
