Figure 57-1 Change in total respiratory compliance during pneumoperitoneum for laparoscopic cholecystectomy. The intra-abdominal pressure was 14 mm Hg, and the head-up tilt was 10 degrees. The airway pressure (Paw) versus volume (V) curves and data were obtained from the screen of a Datex Ultima monitoring device. Curves are generated for before insufflation (A) and 30 minutes after insufflation (B). Values are given for tidal volume (TV, in mL); peak airway pressure (Ppeak, in cm H₂ O); plateau airway pressure (Pplat, in cm H₂ O); total respiratory compliance (C, in mL/cm H₂ O); and end-tidal carbon dioxide tension (PETCO₂ , in mm Hg).