Prognostic classification based on P/F and PEEP in invasively ventilated ICU patients with hypoxemia-insights from the MARS study.

Reclassification after 24 h resulted in a strong trend with increasing mortality from group I to group IV (31, 31, 37, and 48% in groups I to IV, respectively; P < 0.01).

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From group I to group IV, FiO 2 and PaCO 2 increased; APACHE IV also increased from group I to group IV, but this difference did not reach statistical significance.

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