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Figure 2 Superior vena cava (SVC) oxygen saturation and inferior vena cava (IVC)/femoral venous (FV) oxygen saturation at CO2 35, 45, 55, and 40 mm Hg. The lines represent individual patient values, with the bold line indicating the mean value. *Adjusted p value for difference between arterial carbon dioxide tension (PaCO2) 35 and 45 mm Hg. {dagger}Adjusted p value for difference between PaCO2 45 and 55 mm Hg. {ddagger}Adjusted p value for difference between PaCO2 55 and 40 mm Hg.