信号平均心电图对冠心病的诊断价值

Evaluation of the signal-averaged electrocardiogram for detection of coronary heart disease

本文观察信号平均心电图（ＳＡＥＣＧ）对冠心病的诊断价值，对老年冠心病组和老年对照组的ＳＡＥＣＧ进行分析。老年冠心病组滤波后ＱＲＳ波时限（ＴＱＲＳ）、滤波后ＱＲＳ电压低于４０μＶ的时限（ＬＡＳ４０）、滤波后ＱＲＳ终末４０ｍｓ的平均平方根电压（ＲＭＳ４０）分别是１０４．４５±２０．０１ｍｓ、３０．６９±７．７１ｍｓ、３８．８８±６．７１μＶ，与老年对照组相比明显差异（分别为Ｐ＜０．０５、Ｐ＜０．０１、Ｐ＜０．０１）；在非老年人群中，超声运动负荷试验阳性（ＥＸＥ．Ｐ）组与对照组和超声运动负荷试验阴性（ＥＸＥ．Ｎ）组的ＴＱＲＳ、ＬＡＳ４０、ＲＭＳ４０对比，前组较后２组也存在明显差异（分别为Ｐ＜０．０１、Ｐ＜０．０５、Ｐ＜０．０１）。表明ＳＡＥＣＧ作为无创伤性和安全的方法，对冠心病的诊断具有一定的临床价值。

The paper assessed the signal-averaged electrocardiogram (SAECG) for detection coronary heart disease(CHD). Analysis and compares the SAECG between the aged normal subjects and aged patients with CHD. In the aged patients with CHD, the duration of total QRS(TQRS), the duration of signals less than 40μV(LAS40) and a root mean square voltage of last 40 ms of QRS(RMS40) were 104. 45±20. 01 ms , 30. 69± 7. 71 ms and 38. 88± 6. 71 μV respectively, which were have significantly different from those in the aged nomal subjects (P less than 0. 05, 0. 01, 0. 01 respectively). The same results were observed in the group of non-aged subjects. In the group with positive exercise echocardiography(EXE. P), the TQRS, LAS40 and RMS40 were also significantly different from those of the aged normal subjects (P less than 0. 01, 0. 05 and 0. 01 respectively). Our data domonstrate that the signal-averaged electroardiogram may be a valid and safe method for evaluating coronary heart disease.