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当前学科:重症医学综合练习
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患者男性,70岁。既往慢性咳嗽、咳痰30余年,活动后胸闷气促10余年。1周前因感冒后病情加重入院。血气分析(呼吸空气时)示:pH7.28,PaO
2
50mmHg,PaCO
2
65mmHg。该患者应给予的吸氧浓度为()。
A . A.21%
B . 30%
C . 60%
D . 80%
E . 100%
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