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患者,男性,岁,因近日咳嗽、咳痰、气急明显,又出现神志不清、发绀而入院。既往有肺气肿病史。动脉血气分析 pH7.31,Pa0252mmHg,PaC0261mmHg,给予低浓度氧疗的依据是A.
慢性呼吸衰竭时,呼吸中枢对 CO2 的刺激仍很敏感
B.
缺 O2 是维持病人呼吸的重要刺激因子
C.
氧浓度大于 30%易引起氧中毒
D.
高浓度氧疗容易使病人呼吸兴奋
E.
便于应用呼吸兴奋剂
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