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患者，男性，72岁，反复咳嗽、咳痰30年，伴劳力性呼吸困难3年，近3天来咳喘加重，伴双下肢水肿，嗜睡。既

往糖尿病史5年、脑血栓病史2年。查体：端坐位，口唇略发绀，双球结膜充血、水肿。双肺呼吸音减低，呼气相延长。HRll8次／分，心脏未闻及杂音。肝肋下2cm可触及肿大，双下肢轻度凹陷性水肿。最有助于诊断的检查是

A.超声心电图

B.血气分析

C.胸部CT

D.冠状动脉造影

E.肝肾功能及电解质检测

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第3题

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第4题

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第7题

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第9题

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