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患者女,42岁,3年前健康检查时发现心跳过缓,活动后胸闷、气促。近半年来症状加重,反复发作头晕和晕厥。于1992年4月20日入院。体检,BP 15/8 kPa,心率42次/分,律规则,心尖区有Ⅱ级收缩期吹风样杂音,胸部摄片和超声心动图提示心脏左右心室均扩大。临床诊断:心肌病。入院当天记录的心电图(附图A)示窦性P波,频率84次/分,以2:1下传心室,QRS间期0.14～0.16秒,心室率为42/
Female patient, 42 years old, 3 years ago when the health examination found bradycardia, chest tightness after activities, shortness of breath. In the past six months, the symptoms increased, repeated attacks of dizziness and fainting. Admitted to hospital on April 20, 1992. Physical examination, BP 15/8 kPa, heart rate 42 beats / min, rule of law, apex systolic type Ⅱ systolic hair blowing noise, chest radiography and echocardiography prompted the heart ventricular enlargement. Clinical diagnosis: cardiomyopathy. The electrocardiogram recorded on the day of admission (Figure A) shows a sinus P wave with a frequency of 84 beats / min to deliver the ventricle at 2: 1, with a QRS interval of 0.14 to 0.16 seconds and a ventricular rate of 42 /