冠心病患者突感心悸。胸闷，血压为12/8kPa(90/60mmHg),心尖部第一心音强弱不等;心电图示心房率慢于心室率，两者无固定关系，QB. S波增宽为0.12秒，可见心室夺获和室性融合波。诊断为

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