1对象和方法患者,男性,19岁,体质量69 kg,山西翼城人。主因“阵发性心悸、气短1年,加重1个月”入院。患者于1年前无明显诱因感心悸、胸闷、气短不适,无头晕、晕厥,偶有黑朦,每次持续3~5 min后可自行缓解。自诉当地医院心电图提示房性心动过速,具体不详,未予以正规诊疗。近1个月来,患者自觉上述症状发作次数频繁,程度加重,持续时间延长,活动后气短明显,遂入我科。患者自发病来, 1 Subjects and methods Patients, male, 19 years old, body weight 69 kg, Shanxi Yicheng people. The main reason “paroxysmal palpitations, shortness of breath for 1 year, increased 1 month ” admission. Patients with no obvious incentive 1 year ago, heart palpitations, chest tightness, shortness of breath, no dizziness, syncope, occasional darkness, each lasting 3 to 5 minutes after spontaneous relief. Private local hospital ECG prompted atrial tachycardia, specifically unknown, not to regular treatment. Nearly a month, the patient consciously more frequent episodes of the above symptoms, the degree of aggravating, duration, shortness of breath after the event was obvious, then into our department. Patients from the onset,