Oxygenation Index

Q: What is the Oxygenation Index?

Answer: 

The Oxygenation Index (OI) is defined as the reciprocal of PF times MAP (Mean Airway Pressure)

OI = (FiO2 × mean airway pressure)/PaO2

It is proposed that OI is a better representative of oxygenation dysfunction as it takes in account mean airway pressure from the ventilator. A lower oxygenation index is better. As the oxygenation of a person improves, they will be able to achieve a higher PaO2 at a lower FiO2

#ventilators

#pulmonary

References:

1. Vadi S. Correlation of Oxygen Index, Oxygen Saturation Index, and PaO2/FiO2 Ratio in Invasive Mechanically Ventilated Adults. Indian J Crit Care Med. 2021 Jan;25(1):54-55. doi: 10.5005/jp-journals-10071-23506. PMID: 33603302; PMCID: PMC7874290.

2. Dechert RE, Park PK, Bartlett RH. Evaluation of the oxygenation index in adult respiratory failure. J Trauma Acute Care Surg. 2014 Feb;76(2):469-73. doi: 10.1097/TA.0b013e3182ab0d27. PMID: 24458052.

3. Myers LC, Mark D, Ley B, Guarnieri M, Hofmeister M, Paulson S, Marelich G, Liu VX. Validation of Respiratory Rate-Oxygenation Index in Patients With COVID-19-Related Respiratory Failure. Crit Care Med. 2022 Jul 1;50(7):e638-e642. doi: 10.1097/CCM.0000000000005474. Epub 2022 Feb 7. PMID: 35120044; PMCID: PMC9196918.