
| FIO2 | |
| PaO2 (mmHg) | |
| Peak Inspiratory Pressure (mmHg) | |
| Inspiratory Time (sec) | |
| Peak End Expiratory Pressure (mmHg) | |
| Expiratory Time (sec) | |
| Total Resp. Cycle Time (sec) |

Oxygen index represents the oxygenation dysfunction in the ICU patients
Formula used:
Where,
OI = Oxygen Index
PIP = Peak inspiratory pressure
it = Inspiratory time
PEEP= Peak end expiratory pressure
et = expiratory time
ct = Total Resp.cycle Time
FiO 2 = Fraction of inspired oxygen
PaO 2 =Partial pressure of oxygen in arterial blood
OI = 35 - 60 POOR OXYGENATION, CONSIDER ECMO IN PEDIATRIC PATIENTS
Reference:
Haperen MV, Van der Voort PH, Bosman RJ. The Oxygenation Index compared with the P/F ratio in ALI/ARDS. Critical Care 2012, 16(Suppl 1):P91.