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Tracings of volume and Pao during slow inflation before pneumoperitoneum in subject P5. Lines fit to the volume trace intersect at the time when Pao is 3.9 cmH2O (arrow), indicating the threshold Pao (Pao,thr) needed to start inflating the lungs. This pressure was determined before and during pneumoperitoneum in all subjects. Pred vol, predicted volume.
