患者女,12岁。因突然晕倒、心跳呼吸停止15分钟急诊。既往有晕厥史4～5年,无家族史。查体:无自主呼吸,呈昏迷状,心率81次/分,各种神经反射消失,其余无异常。查血、大小便常规、电解质、尿素氮、二氧化碳结合力都正常;心电图示窦性 Female patient, 12 years old. Due to a sudden fainting, heart breathing stop 15 minutes emergency. Past history of syncope 4 to 5 years, no family history. Examination: No spontaneous breathing, was coma, heart rate 81 beats / min, a variety of nerve reflex disappeared, the rest without exception. Check blood, urine routine, electrolytes, urea nitrogen, carbon dioxide binding are normal; ECG sinus