患者,女性,80岁,因反复胸部不适半年余,再发1天入院,既往有高血压病史,院前无用药史。查体:体温:36.3℃脉搏:113次/分呼吸:20次/分血压:175/105 mm Hg,双肺呼吸音清,心率123次/分,律不齐,心音强弱不等,各瓣膜区未闻及病理性杂音,双下肢无水肿。入院心电图(图1):显示为窦性心律,反复发作短阵房性心动过速,呈无休止性;房性心动过速的P'波形态持续变化,Ⅱ、Ⅲ及a VF导联可见P'波尖端沿基线呈规律性扭转,直立P'波由小到大、倒置P'波由浅到深渐变,P'-P'间期0.38~0.44秒(136~157次/分),P'-R间期0.12~0.20秒;直至P'波未下传而房性心动过速短暂终止,
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