Oxygenation Index formula?

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Oxygenation Index formula?

Oxygenation index quantifies how severe the oxygenation problem is by linking how much airway pressure and oxygen the patient is receiving to how much oxygen is actually in the blood. The formula uses mean airway pressure times FiO2, scaled by 100, and divided by PaO2, so increasing the support (MAP or FiO2) or decreasing PaO2 raises the index, indicating worse oxygenation. The 100 scales FiO2 (a fraction) into a practical range for comparison. This is distinct from the P/F ratio, which is PaO2 divided by FiO2 and does not include airway pressure. It also doesn’t use PaCO2, which is a ventilation variable, not oxygenation.

Oxygenation index quantifies how severe the oxygenation problem is by linking how much airway pressure and oxygen the patient is receiving to how much oxygen is actually in the blood. The formula uses mean airway pressure times FiO2, scaled by 100, and divided by PaO2, so increasing the support (MAP or FiO2) or decreasing PaO2 raises the index, indicating worse oxygenation. The 100 scales FiO2 (a fraction) into a practical range for comparison. This is distinct from the P/F ratio, which is PaO2 divided by FiO2 and does not include airway pressure. It also doesn’t use PaCO2, which is a ventilation variable, not oxygenation.

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