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【单选题】
患者，男，72岁，患有高血压．心绞痛2年，20小时前经股动脉途径行冠状动脉造影显示：升主动脉明显扩张，左前降支95%阻塞，半小时前患者起床后突感胸闷、胸痛、呼吸困难、口唇发甘，血压**50mmHg，颈静脉明显充血，血气PaO2 45mmHg，PaCO2 35mmHg，最可能的诊断是A.
急性心肌梗死
B.
主动脉夹层
C.
记性肺栓塞
D.
心脏亚塞
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