Setting
Patients were randomly assigned to the control group or the SpOFlowchart of the study.In the control group, only observation was performed, and ORi data were recorded without informing the intensive care physician. Oxygen therapy and FiOIn the SpOIf ORi was ≥0.01 and SpOIf ORi was ≥0.01 and SpOIf ORi was 0.00 and SpOIf ORi was 0.00 and SpONo restrictions were applied to the mechanical ventilator mode in either group, and all adjustments were made by physicians as per the hospital’s ICU policy, with nurses only being able to make suggestions.