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Study protocol. (A) Four predefined time points (T1–T4) when intraoperative ventilatory parameters were recorded and arterial blood gas analysis was performed and two time points of ultrasound examination. (B) The protocol of recruitment maneuver and decremental PEEP trial in the individualized group. These protocols were performed just before T2. This recruitment maneuver was also performed in the standardized group. RM = recruitment maneuver.
