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【单选题】
7男，54岁。活动时喘憋渐加重，出现夜间憋醒。高血压病史IO。超声心动图：左心房、左心室扩大，LVEF35%。患者喘憋的机理为( )
A.
左心室充盈压明显降低
B.
左心室舒张功能明显受损
C.
左心室每明显高于右心室每
D.
左心室心搏出量明显少于右心室心搏出量
E.
心室搏出量占心室舒张末容积的百分比明显降低
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