Patients and methods: a RCT study on 61 patients divided into two groups: control group (30 patients) undergoing intraoperative ventilation with volume control ventilation (VCV) mode, volume tidal (VT) 8 ml / kg ideal body weight (IBW), PEEP 5 cmH2O with no lung recruitment maneuver (LRM) and intervention group (31 patients) undergoing intraoperative ventilation with VCV mode, VT 8 ml / kg IBW, PEEP 5 cmH2O, with lung recruitment maneuver (LRM).