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Combines mean airway pressure with inspired oxygen and arterial oxygen tension, the index used in paediatric acute lung injury grading.
Oxygenation index
OI = FiO2 (%) x mean airway pressure (cmH2O) / PaO2 (mmHg)
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
It reflects the ventilator support required to achieve the oxygen level, which a P/F ratio alone ignores.
PALICC grades paediatric ARDS as mild 4-8, moderate 8-16 and severe 16 or above.