Fig. 5.
Changes in ventilation distribution (A), center of ventilation (B), nondependent silent spaces (C), dependent silent spaces (D), plateau pressure (E), driving pressure (F), dynamic lung compliance (G), Pao2/Fio2 ratio (H), elastance of chest wall (I), and end-expiratory transpulmonary pressure (J), presented as mean ± SD. Dashed lines represent interpolation lines; open circles, conventional positive end-expiratory pressure (PEEP); solid circles, high PEEP. Pao2/Fio2 ratio, arterial partial pressure of oxygen/inspired fraction of oxygen. *P < 0.05 versus conventional PEEP. #P < 0.05 versus after the induction of anesthesia in the conventional PEEP group.¶P < 0.05 versus after the induction of anesthesia in the high PEEP group.