Oxygen content of mixed venous blood CvO2 is given by CvO2 = (Hb x 1.34 x SvO2) + (PvO2 x 0.003). Which option shows this formula correctly?

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Multiple Choice

Oxygen content of mixed venous blood CvO2 is given by CvO2 = (Hb x 1.34 x SvO2) + (PvO2 x 0.003). Which option shows this formula correctly?

The idea is that mixed venous oxygen content comes from two parts: the oxygen bound to hemoglobin and the small amount dissolved in plasma. Bound oxygen is calculated as Hb × 1.34 × SvO2, where 1.34 mL O2/g Hb is the amount Hb can carry and SvO2 is the fraction of Hb currently carrying O2. Dissolved oxygen is PvO2 × 0.003, using the venous O2 partial pressure times the solubility constant in plasma. Add these two parts together to get CvO2. Therefore CvO2 = (Hb × 1.34 × SvO2) + (PvO2 × 0.003). The other forms misplace factors or use the arterial partial pressure (PaO2) instead of the venous PvO2, or multiply components that should be separate, so they don’t represent the correct two-component sum.

The idea is that mixed venous oxygen content comes from two parts: the oxygen bound to hemoglobin and the small amount dissolved in plasma. Bound oxygen is calculated as Hb × 1.34 × SvO2, where 1.34 mL O2/g Hb is the amount Hb can carry and SvO2 is the fraction of Hb currently carrying O2. Dissolved oxygen is PvO2 × 0.003, using the venous O2 partial pressure times the solubility constant in plasma. Add these two parts together to get CvO2. Therefore CvO2 = (Hb × 1.34 × SvO2) + (PvO2 × 0.003). The other forms misplace factors or use the arterial partial pressure (PaO2) instead of the venous PvO2, or multiply components that should be separate, so they don’t represent the correct two-component sum.

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