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. 2022 Jan 31;46(11):652–654. doi: 10.1016/j.medin.2022.01.005

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PaO₂/FiO ratio, respiratory system compliance, DPaw and VT/PBW before and after the first, fifth and last prone position cycle. PaO₂/FiO₂: ratio of the partial pressure of oxygen in arterial blood (PaO₂) to the inspiren oxygen fraction (FiO₂); Crs: Respiratory system compliance; DPaw: airway driving pressure; VT/PBW: tidal volume to predicted body weight; S-1: Supine before first session; P-1: after first prone session; S-5: Supine before fifth prone session; P-5: After fifth prone session; S-last: Supine before last prone session; P-last: after last prone session. Circles and squares correspond to the mean and mustaches to the standard deviations. ^☆p = 0.01: comparison of DPaw between survivors and non-survivors in S-last. ^∮p = 0.0001: comparison of the magnitude of change in PaO₂/FiO₂: between survivors and non-survivors in supine vs prone position. *p = 0.001: comparison of PaO₂/FiO₂: between survivors and non-survivors in S-last and P-last.