Patients will be randomly assigned to treatment groups using a module of the software (REDCap Software - Version 5.9.2) responsible for data recording (center stratified randomization).

• 1. THE HIGHER PEEP LEVEL

Mechanical ventilation with protective tidal volume of 7ml/kg PBW and the level of PEEP at 12 cmH2O with lung recruitment maneuvers performed hourly

• 2. THE LOWER PEEP LEVEL

Mechanical ventilation with protective tidal volume of 7ml/kg PBW and the level of PEEP at 4 cmH2O without lung recruitment maneuvers