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Comparison of Qs/Qt and OI at different time points between the two groups. A: Comparison of Qs/Qt at different time points between the two groups; B: Comparison of OI at different time points between the two groups. Compared with the control group, *P<0.05; compared with T1 of the titration group, #P<0.05. Qs/Qt: intrapulmonary shunt fraction; OI: oxygenation index.
