题目内容

男,67岁。反复咳嗽、咳痰、喘息5年,再发加重1周。查体:嗜睡,口唇发绀,两肺可闻及哮鸣音和湿性啰音,心率120次/分。动脉血气分析示:pH 7.10、Pa02 54mmHg,PaCO2 103mmHg。该患者发生呼吸衰竭最主要的机制是

A. 肺泡通气量减少
B. 无效腔通气减少
C. 呼吸中枢抑制
D. 弥散功能障碍
E. 胸廓扩张受限

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