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【单选题】
、2013U1-118男,72岁。咳嗽、咳痰30年,加重伴气短10天。查体:神志清楚,口唇发绀,桶状胸,双肺少许干湿性啰音。胸部X线片示双肺纹理增粗紊乱。血气分析示PaO255mmHg,PaCO239mmHg。该患者发生呼衰的机制是A.
肺内分流
B.
弥散功能障碍
C.
肺通气不足
D.
氧耗量增加
E.
通气/血流比例失调
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