On the other hand , in patients who failed to wean , so2 decreased during weaning since oxygen transport did not increase enough in the face of the increased oxygen demand due to the increased work of breathing 另一方面,脫機(jī)失敗的病人,由于氧供沒有增加到足以滿足呼吸做功增加引起的氧耗增加,脫機(jī)期間的so2降低。