Measurements
expiratory occlusion
BLIND
All esophageal pressure signal recordings were independently inspected by two investigators blind to the other clinical data, and those considered non-valid were excluded from the analyses including esophageal pressure data.Inspiratory and expiratory occlusion maneuvers were performed to measure Abdominal pressure (An arterial blood gas was performed after 15 min free of any occlusion maneuver, and EELV was measured at PEEP 5 cmHA low-flow inflation (5 L minComplete airway closure and corresponding AOP were identified by the inspection of the pressure–volume curves as previously described [