These results indicate that correct selection of FiO 2 according to PaO 2 and FiO 2 correlation chart can rapidly elevate PaO 2,the increase of HCO - 3 may be related to the difference in baseline value.

• 按PaO2与FiO2相关图选择FiO2能迅速提高患者的PaO2； HCO－3的升高可能与基础数值的差异有关。