Fig. 2. Arterial oxygen tension (Pao2)/fraction of inspired oxygen (Fio2) ratio. Values are given as mean ± SD for the control (gas ventilation), vaporized perfluorohexane (PFH), and partial liquid ventilation (PLV) groups. Time 0 corresponds to injury. After time 2, a recruitment maneuver was performed, and the positive end-expiratory pressure increased to optimal elastance while other respiratory settings were kept constant (see text). There were no significant differences between any therapy group and control. NS = not significant.