背景:复极不稳定性可由T波电交替(TWA)所体现,研究已证明它对于心律失常风险评估非常有用。然而,有关TWA与室性心动过速(VTA)自发性起始之间的时间关系尚不清楚。作者评估了自发性持续VTA(>30s)的H olter心电图中复极化的连续动力学。方法和结果:对来自42例患者(79%患有缺血性心脏病;左室射血分数为37%±15%)的动态心电图资料进行数字化处理,选择T波幅度最高的导联进行分析。 Background: Polar instability can be demonstrated by T-wave alternation (TWA), which has been shown to be very useful for risk assessment of arrhythmias. However, the timing of the spontaneous onset of TWA and ventricular tachycardia (VTA) remains unclear. The authors evaluated the continuous kinetics of repolarization in the Holter electrocardiogram of spontaneous sustained VTA (> 30 s). Methods and Results: Dynamic electrocardiographic data from 42 patients (79% with ischemic heart disease; 37% ± 15% with left ventricular ejection fraction) were digitized and the lead with the highest T-wave amplitude was selected for analysis .