Figure 4.

Intraoperative changes in the ventilator-related parameters. (A) shows arterial partial pressure of oxygen/fraction of inspired oxygen (PaO₂/FiO₂), (B) shows dynamic respiratory compliance, and (C) shows driving pressure. *: p = 0.005, †: p = 0.002, and ‡: p = 0.004 and §: p < 0.001, respectively. Four time points were predefined for recording intraoperative ventilatory parameters and performing arterial blood gas analysis as follows: T1 = after anesthesia induction, T2 = after achieving the pneumoperitoneum under the steep Trendelenburg position, T3 = 1 h after T2, and T4 = just before extubation in the operating room.