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阵发性室上性心动过速(以下简称 PSVT)是临床常见病,多见于表面上无器质性心脏病者,从儿童到老年都可患病。发作时心率在150～230/分,常见的是180/分左右,心率常保持固定。关于 PSVT 的发生机制一向有两种理论,一是异位灶(在心房或房室连接区)的自律性增强而引起,称异位性心动过速(Ectopic tachycardia);
Paroxysmal supraventricular tachycardia (hereinafter referred to as PSVT) is a common clinical disease, more common in the surface without organic heart disease, from children to old age can be sick. Attack heart rate at 150 ~ 230 / min, common is around 180 / min, heart rate often remain fixed. There have been two theories about the mechanism of PSVT. One is the ectopic focus (caused by the increased self-discipline of atrial or atrioventricular junction), which is called Ectopic tachycardia.