心动过速发作时限超过一天以上时,常常表现出平素所见不到的心电图改变。对此,即称做心动过速后综合病征。病因可能是由于心动过速引致心肌疲劳、缺氧和代谢障碍。心电图变化是T波异常(出现T波低平、双向、倒置或类似于冠状T波,QRS波通常无改变)。自觉症状是极度的疲劳感,也可有轻度的一过性的心脏扩大。本征,每因 Tachycardia attack more than a day when the time limit, often showing the usual ECG changes can not be seen. In this regard, that is called after tachycardia syndrome. Etiology may be due to tachycardia resulting in myocardial fatigue, hypoxia and metabolic disorders. ECG changes are T wave abnormalities (T wave appeared flat, bi-directional, inverted or similar to coronary T wave, QRS wave is usually no change). Subjective symptoms are extreme fatigue, but also mild transient cardiac enlargement. Intrinsic, each factor