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QT间期离散度(QTd)是指心电图(ECG)各导联间QT间期的变异程度。其产生与心肌细胞除极后复极不均匀有关。QTd延长与致命性室性心律失常的发生密切相关,而致命性室性心律失常是急性心肌梗塞(AMI)的主要死因,因此将其作为AMI预后的一项指标已越来越受到关注。本文通过对200例AMI患者QTd和JTd的动态观测,探讨如下。
QT interval dispersion (QTd) refers to the degree of variation of the QT interval between leads of the electrocardiogram (ECG). Its generation and cardiomyocytes depolarization repolarization uneven. QTd prolongation is closely related to the occurrence of fatal ventricular arrhythmias, whereas fatal ventricular arrhythmias are the major cause of death in acute myocardial infarction (AMI). Therefore, it has drawn more and more attention as an indicator of AMI prognosis. This article through the 200 cases of AMI patients with QTd and JTd dynamic observation, discussed below.