In Figure 2 , the utilization of ventilation modes and rescue therapies in the entire group are shown. Briefly, PCV use equaled VCV at Day 10, preceded by deterioration in oxygenation and respiratory mechanics: PaO 2 / FIO 2 78 ± 24 vs. 128 ± 33, (P = 0.03); PaCO 2 44 ± 4 vs. 35 ± 3 mmHg (P = 0.04); pH 7.29 ± 0.03 vs. 7.39 ± 0.05 (P = 0.05), and plateau pressures of 30 ± 2 vs. 25 ± 3 cmH 2 O (P = 0.03). Recruitment maneuvers became significantly more common in non-survivors at Day 3 (46%, vs. 29% in survivors; P = 0.03), as did prone positioning (24%, vs. 14%; P = 0.001). After that, only prone positioning remained significantly more used in nonsurvivors (at Day 7: 38%; vs. 14%, P = 0.004; and at Day 10: 25%; vs. 5%, P = 0.02). Six patients received tracheal gas insufflation; only one survived. Neuromuscular blockers were prescribed in 18% of patients on admission; and their use was subsequently more frequent in non-survivors (Day 3: 14% vs. 8%, P = 0.02; and Day 7: 14% vs. 8%, P = 0.04).