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杨××，男，44岁。因反复头昏及晕厥发作4月于1984年6月6日入院。患者于1984年2月起经常在剧烈运动或情绪激动时出现短阵心前区刺痛，不放射，伴头昏，眼发黑，为时数分钟，休息后即可消失，尚能坚持正常工作。1984年5月24日在工作时突然意识丧失，倒地，不伴四肢抽搐及大、小便失禁，约十余分钟才清醒，送到当地医院住院，ECG为窦性心动过缓及交界区性逸搏性心律，心室率仅30～40次/分。住院期间又多次发生阵发性心房颤动。既往无高血压史，有烟酒嗜好20年。
Yang × ×, male, 44 years old. Due to repeated dizziness and fainting in April on June 6, 1984 admission. Patients in February 1984 often in strenuous exercise or emotional excitement when a burst of precordial tingling, no radiation, with dizziness, black eyes, for a few minutes, you can disappear after the rest, still able to uphold normal jobs. May 24, 1984 at work suddenly lost consciousness, fell to the ground, not accompanied by extremities convulsions and urinary incontinence, about ten minutes before awake, sent to a local hospital, ECG for sinus bradycardia and junctional area Escaping heart rhythm, ventricular rate was only 30 to 40 beats / min. Paroxysmal atrial fibrillation occurred many times during hospitalization. No previous history of hypertension, alcohol and tobacco have a 20-year hobby.