老年女性，60岁。既往肺心病病史。因呼 吸困难入院。入院查体：神志清晰。血气分 析：Pa02 33mmHg, PaC02 64mmHg。给予氧 疗后神志不清，复査血气分析:Pa02 74mmHg, PaC02 83mmHg。其神志不清的原 因考虑

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