1临床资料患者女性61岁。因无明显诱因出现发作性晕厥入院。晕厥持续30min,为旋转性伴牙关紧闭,未见抽搐。体检:P50次/min,BP 136/50mmHg,R19次/min,心尖部可闻及Ⅲ级收缩期吹风样杂音。实验室检查,血K+3.11mmol/L,血清钙2.16 mmol/L。心电图诊断:心房颤动伴Ⅲ°房室传导阻滞, 1 clinical data of women 61 years old. Because there is no obvious incentive to onset of syncope admission. Syncope continued for 30min, for the rotation with the teeth closed, no convulsions. Physical examination: P50 times / min, BP 136 / 50mmHg, R19 times / min, the apex can be heard and Ⅲ systolic hair-like murmur. Laboratory tests, blood K + 3.11mmol / L, serum calcium 2.16 mmol / L. ECG diagnosis: atrial fibrillation with Ⅲ ° atrioventricular block,