心肌梗死不同时期QT离散度的测定及其意义

Determination of QT dispersion in different stage of myocardial infarction

目的:通过对心肌梗死(MI)不同时期QT离散度(QTd)的测定,探讨急性心肌梗死(AMI)时死亡率增高的机制。方法:对44例AMI病人按心电图的演变分为3个时期,同步记录12导联心电图计算QTd。结果:MI急性期QTd=72.28±15.42;恢复期QTd=49.21±9.55;陈旧期QTd=34.45±9.89。急性期与恢复期比较P<0.001,与陈旧期比较P<0.001;恢复期与陈旧期比较P<0.0l。结论:MI急性期QTd增大,随着病程的延长QTd逐渐下降。QTd增大是AMI导致心律失常致死亡率增高的一个独立因素。

Objective： To discuss the mechanism of the increasing death rate of acute myocardial infarction （AMI）through the measure of QT diffusion （QTd）in different stages of myocardial infarction. Methods： There were 3 stages according to the ECG transformation for 44 patients with AMI.As a patient was connected by 12 conductors in 12 different sites, the results of QTd could be recorded. Results： In acute stage of MI,QTd=72.28±15.42; in recovery stage of MI, QTd =49.21±9.55 ; in remaining stage of MI, QTd =34.45±9.89. Compared QTd between the acute stage and the recovery stage （P〈0.001）; the acute stage and the remaining stage （P〈0.001）; the recovery stage and the remaining stage ： （P〈0.01）, obvious differences were found. Conclusion： QTd is decreasing as a result of the treatment. The increasing QTd of the acute stage of MI is an independent factor that can lead to the increasing death rate of cardiac arrhythmia.