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Figure 3 | Critical Care

Figure 3

From: Variation in the PaO2/FiO2 ratio with FiO2: mathematical and experimental description, and clinical relevance

Figure 3

Model simulations of arterial oxygen saturation and arterial oxygen partial pressure/inspired oxygen fraction ratio. (a) Inspired oxygen fraction (FiO2) versus arterial oxygen saturation (SaO2). (b) FiO2 versus the partial pressure of oxygen in arterial blood (PaO2)/FiO2 ratio. Simulations performed using shunt = 5%, parameter ΔPO2 (fA2) = 0–30 kPa (0.9–0.11), oxygen consumption = 0.26 l/min, alveolar minute volume = 5.25 l. Points a and b, the PaO2/FiO2 ratios for FiO2 = 0.26 (point a) and FiO2 = 0.35 (point b) – corresponding to the extremes of the relevant range of FiO2 (thick solid line).

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Critical Care

ISSN: 1364-8535