【病例】　男 ,44岁。既往身体健康。1年前无明显诱因突发胸闷、憋气伴全身乏力不适 ,呈进行性加重。心电图示 ～ 度房室传导阻滞 ,外院诊断为病毒性心肌炎并房室传导阻滞 ,给予相应治疗 2周无效。此后胸闷、憋气、头晕等症状反复出现 ,多在夜间发作 ,逐渐加重 ,心率最慢时 1 [Case] ​​Male, 44 years old. In the past, good health. A year ago, no obvious incentive sudden chest tightness, suffocation with generalized malaise, was progressive increase. Electrocardiogram ~ degree atrioventricular block, outside the hospital diagnosed with viral myocarditis and atrioventricular block, given the appropriate treatment for 2 weeks is invalid. Since then, chest tightness, suffocation, dizziness and other symptoms repeatedly appear in the night attack, and gradually increased, the slowest heart rate 1