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The '''oxygenation index''' is a calculation used in intensive care medicine to measure the [[fraction of inspired oxygen]] (FiO2) and its usage within the body. | |||
A lower oxygenation index is better - this can be inferred by the equation itself. As the oxygenation of a person improves, they will be able to achieve a higher PaO2 at a lower FiO2. This would be reflected on the formula as a decrease in the numerator or an increase in the denominator - thus lowering the OI. Typically an OI threshold is set for when a neonate should be placed on ECMO, for example >40. | |||
== Equation == | |||
:<math> OI = \frac{F_i O_2 * M_{PAW}}{P_a O_2}</math><ref>Ortiz RM, Cilley RE, Bartlett RH. Extracorporeal membrane oxygenation in pediatric respiratory failure. Pediatr Clin North Am. 1987 Feb;34(1):39-46.</ref> | |||
* FiO2 = [[Fraction of inspired oxygen]] | |||
* MPAW = [[Mean airway pressure]] | |||
* PaO2 = Partial pressure of oxygen in arterial blood | |||
== References == | |||
<references/> | |||
{{Mechanical ventilation}} | |||
[[Category:Respiration]] |
Latest revision as of 05:56, 16 October 2013
The oxygenation index is a calculation used in intensive care medicine to measure the fraction of inspired oxygen (FiO2) and its usage within the body.
A lower oxygenation index is better - this can be inferred by the equation itself. As the oxygenation of a person improves, they will be able to achieve a higher PaO2 at a lower FiO2. This would be reflected on the formula as a decrease in the numerator or an increase in the denominator - thus lowering the OI. Typically an OI threshold is set for when a neonate should be placed on ECMO, for example >40.
Equation
- FiO2 = Fraction of inspired oxygen
- MPAW = Mean airway pressure
- PaO2 = Partial pressure of oxygen in arterial blood
References
- ↑ Ortiz RM, Cilley RE, Bartlett RH. Extracorporeal membrane oxygenation in pediatric respiratory failure. Pediatr Clin North Am. 1987 Feb;34(1):39-46.