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Intra-operative and post-operative pulmonary OI. In the PV group, the OI value was higher compared with that in the CV group at T3, T5 and T6. Values are expressed as the mean ± standard deviation. *P<0.05 vs. CV group. Time-points: T1, after endotracheal intubation; T3, 60 min after pneumoperitoneum; T5, 30 min after tracheal extubation; T6, on the day after the surgery. OI, oxygen index; CV, conventional ventilation; PV, protective ventilation.
