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【单选题】
女性，58岁，因慢性阻塞性肺疾病呼吸衰竭住院，行气管插管机械通气支持。1天后神志已转清，PaCO由10．6kPa（80nmfftg）降至5．1kPa（38mmHg）本例患者机械呼吸通气量需要调节，主要根据的因素是（）
A.
PaO 2
B.
肺静动脉血分流量（Qs／Qt）
C.
随访血气了解pH和有无复合性酸碱紊乱
D.
患者神志状态
E.
肺泡-动脉氧分压差（PA-aO 2 ）
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