Introduction Previous studies have shown through theoretical analyses that the ratio of the partial pressure of oxygen in arterial blood (PaO 2 ) to the inspired oxygen fraction (FiO 2 ) varies with the FiO 2 level. The aim of the present study was to evaluate the relevance of this variation both theoretically and experimentally using mathematical model simulations, comparing these ratio simulations with PaO 2 /FiO 2 ratios measured in a range of different patients.
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