Effect of Recruitment Maneuvers Plus Optimal PEEP Versus Optimal PEEP Alone in One Lung Ventilation

"Recruitment manoeuvers will be performed as follow Recruitment manoeuvers~1. set FIO2 at 1.0~2. Ppeak limit at 45 cmH2O~3. Respiratory rate set at 6~4. I:E set at 1:1~5. Raise the VT at step of 2 ml/kg PBW until the Pplat is between 30-40 cmH2O~6. If the maximum VT is set without rasing the Pplat, raise PEEP~7. Allow three respiratory cycles with Pplat between 30 and 40 cmH2O~8. End of RM~The recruitment manouvers will be performed after 20 minutes of OLV. At the end of the RM, the VT will be set back to 5 ml/kg while the PEEP will be chosen according to the best static compliance with a decremental trial (from 16 cmH2O, lowering PEEP with steps of 2 cmH2O each until the best compliance is reached)."

In this group the a PEEP level will be added after 20 minutes from OLV. PEEP values will be chosen according to the best static compliance with an incremental trial (i.e. starting from ZEEP, the PEEP values will be increased in step of 2 cmH2O each until the best compliance is reached