患者,男,57岁。因间断心悸、气短15年,反复心动过速及晕厥发作2年余于1990年11月20日入院。患者自1975年开始每遇较重体力活动时即出现轻度心悸、气短,休息后缓解。1988年3月突然出现心动过速,随之晕厥。心电图检查为预激综合征合并心房扑动1:1房室传导,心室率达300次/分。以后经常出现室上速发作及晕厥。既往无高血压病史。体检:BP13/8kPa,心界向左轻度扩大,HR Patient, male, 57 years old. Due to intermittent palpitations, shortness of breath 15 years, recurrent tachycardia and syncope more than 2 years in November 20, 1990 admission. Patients with mild heart palpitations, shortness of breath, and rest after rest have been relieved in each case of heavier physical activity since 1975. March 1988 sudden tachycardia, along with syncope. ECG examination for pre-excitation syndrome with atrial flutter 1: 1 atrioventricular conduction, ventricular rate of 300 beats / min. After the frequent occurrence of supraventricular tachycardia and fainting. No previous history of hypertension. Physical examination: BP13 / 8kPa, heart left slightly expanded, HR