Oxygenation Index (OI) OI = (FiO₂ × Mean Airway Pressure × 100) / PaO₂ FiO₂ Fraction % Mean airway pressure cm H₂O PaO₂ mm Hg kPa Calculate mean airway pressure Oxygenation Index — Mean Airway Pressure (helper) Formula (NIV/BiPAP): MAP ≈ IPAP·(TI/Ttot) + EPAP·(TE/Ttot) Ttot = 60 / RR; TE = Ttot − TI IPAP […]