In this prospective, randomized trial, including patients scheduled for a major open or laparoscopic abdominal surgery (duration \>2 hours) under general anesthesia , the investigators will compare 2 strategies of protective mechanical ventilation: a fixed intraoperative PEEP of 6 cmH2O and an individualized intraoperative PEEP according to the driving pressure.
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incidence of pulmonary post operative complications
Timeframe: first 7 post operative days