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Qs/Qt of the acute respiratory distress syndrome swine model under different conditions. *P<0.05 vs. pre-injury; †P<0.05 vs. injury. Qs/Qt, intrapulmonary shunt ratio; PEEP, positive end-expiratory pressure; Po, optimal PEEP; -n, n cm Hg below Po; +n; n cm Hg above Po.
