临床中常利用体表心电图中的QT间期来评价心室复极时限。心肌复极起始于心肌开始除极后的数毫秒之内
对于心室而言
先除极的室间隔首先复极
而此时心室其它部位的心肌正在除极仍处于QRS波群中。因而
总QT间期反映了整个的心室复极时间
包括最早的QRS波群的起始到最晚的T波终点。QRS波群本身被包含在总QT间期内
在束支阻滞及心室起搏等情况下
由于心室内传导异常产生宽QRS波群而使总QT间期延长
为了消除心室内除极传导的影响
人们引入了JT间期的概念。近年来
随着对药物的致心律失常作用的研究
一个新
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