患者，男，３１岁，因“阵发性心悸气短１８个月，昏厥２次”，于１９９４年２月收住我科，无发热、胸痛、咳嗽、咯血及下肢浮肿史。体格检查：血压１４．０／１０、ｏｋＰａ，双肺呼吸音清，无罗音；心率９０次／分，节律整齐，心前区无震颤及杂音。心电图示阵发性频发性室性 The patient, male, 31 years old, was admitted to our department in February 1994 because of “paroxysmal palpitations, shortness of breath and shortness of breath, 18 months, fainting twice.” There was no history of fever, chest pain, cough, hemoptysis, or lower extremity edema. Physical examination: Blood pressure 14.0/10, okPa, breath sounds clear in both lungs, no rales; heart rate 90 beats/minute, regular rhythm, no tremors and murmurs in the precordial area. Electrocardiogram shows paroxysmal frequent ventricularity