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体表12导联心电图上最长与最短QT-间期的差异反应了心室肌复极的不一致性和电不稳定性的区域性变化程度,这种差异命名为QT间期离散度(QTd)(1),目前已有很多研究显示QTd延长大于60ms的患者病死率增加,QTd在心血管病死亡预测中有重要的意义,可作为并发室性心率失常时敏感的无创性
The difference between the longest and the shortest QT-interval on the lead ECG of body surface 12 reflects the inconsistency of ventricular repolarization and regional variability of electrical instability, and this difference is named QT interval dispersion (QTd) (1) There are a lot of studies have shown that patients with QTd prolonged more than 60ms increased mortality, QTd in the cardiovascular mortality prediction is of great significance, can be used as a concurrent noninvasive ventricular arrhythmia sensitive