题目内容

男性，60岁，既往有慢性支气管炎病史l0年，一周前因感冒后咳嗽加重,痰量增加，神志模糊，两肺哮鸣音，心率120次／分，血气分析：pH7．30，PaO2 50mmHg，PaCO2 80mmHg。下列处理要点首要的是

A. 静脉滴注呼吸兴奋剂
B. 保持呼吸道通畅
C. 低浓度氧气吸入
D. 静脉注射速尿
E. 必要时行机械通气

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