Course of PaO₂/FiO₂ during four consecutive 24-hour periods of prone positioning

In each period, patients were prone (p) 20 hours and supine (s) 4 hours. A benefit from prone positioning was observed during repeated transitions from supine to prone position.

Data from Fridrich, P, Krafft, P, Hochleuthner, H, et al., Anesth Analg 1996; 83:1206.

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