Fig. 3. Pao2/Fio2(P/F) ratio and Paco2throughout the course of the study protocol. No differences in Paco2were observed throughout the study as a result of large SDs. All values are means. *P < 0.05 versus injury; +P < 0.05 versus 30, 60, 90, 120, 180, and 240 min. BL = baseline; HFO = high-frequency oscillation; injury = lavage injury; ITPV = intratracheal pulmonary ventilation; PCV = pressure control ventilation; RM = immediately after lung recruitment at set positive end-expiratory pressure or mean airway pressure; 30, 60, 120, 180, 240 min = time after lung recruitment.