双重性心动过速(下简称双速)是指同时存在房性与房室交界性或室性心动过速,两种心动过速之间并无关系,形成房室脱节。这是一种少见的心律失常,大多数由于严重心脏病合并洋地黄中毒所引起。笔者曾遇到2例,现报告于下。病历摘要例1:郭某,女,42岁。因患“心脏病”十多年,心悸、气促加重伴有浮肿3天,近两周来未用洋地黄类。体检:血压100/64,半卧位,颈静脉怒张,心浊音界向左扩大,心率 Double tachycardia (hereinafter referred to as two-speed) refers to the presence of atrial and atrioventricular junctional or ventricular tachycardia, the two tachycardia has nothing to do between the formation of atrioventricular disconnection. This is a rare arrhythmia, most of them due to severe heart disease caused by digitalis poisoning. I have encountered two cases, the report is now under. Case history summary 1: Kwak, female, 42 years old. Because of suffering from “heart disease” for more than ten years, heart palpitations, aggravating cramps accompanied by edema for 3 days, did not use digitalis nearly two weeks. Physical examination: blood pressure 100/64, semi-recumbent position, jugular vein engorgement, diastolic left heart to expand, heart rate