患者,女,51岁(病历号12189)。因反复发作性胸骨后疼痛一年,近一月加重,于1987年2月22日入院。经心电图等诊断:冠心病,陈旧性下壁、侧壁、正后壁心肌梗塞,心绞痛(劳力型+自发型)。既往无心律失常病史。入院后曾口服消心痛、氨酰心安治疗,但效果不满意,停氨酰心安改服硫氮(艹卓)酮30mg,3次/日。在此期间,心率为80～100次/分,未出现心律失常。3月5日下午,服用硫氮(艹卓)酮后约1小时,患者自行口服氨酰心安25mg。约1小时后,突感胸闷, Patient, female, 51 years old (medical record number 12189). Due to recurrent sternum pain a year, increased in January, was admitted on February 22, 1987. Diagnosed by electrocardiogram and other: coronary heart disease, old inferior wall, lateral wall, posterior wall myocardial infarction, angina (labor + spontaneous). No past history of arrhythmia. After admission, he had oral heartburn, atenolol treatment, but the effect is not satisfied with the solution of sodium alanyl (艹 Zhuo) ketone 30mg, 3 times / day. During this period, the heart rate was 80 to 100 beats / min, no arrhythmia occurred. On the afternoon of March 5, about 1 hour after taking thiadiazole, the patient took 25 mg of atenolol orally. About 1 hour later, suddenly felt chest tightness,