The formula is expressed as oxygenation index (OI) = PaO2/FiO2.
Oxygenation index is an important goal of respiratory treatment and an important index for allowing organ tissues to receive sufficient oxygen for oxygenation. The normal value of oxygenation index is 400-500mmHg. Among the diagnostic standards for acute respiratory distress syndrome (ARDS), the diagnostic standard for ALI is that the oxygenation index is less than 300mmHg, and the diagnostic standard for ARDS is that the oxygenation index is less than 200mmHg.
Extended information:
Notes:
There are some matters that need to be paid attention to when judging the measured value of oxygenation index:
1. The above formula for calculating the oxygenation index will only be relatively accurate when using a nasal cannula to inhale oxygen, the oxygen flow is below 6L/min, the respiratory rate is normal, and the sea level is the same.
2. When using a mask to inhale oxygen (the dead space volume will increase), breathing too fast or too slow, or at too high an altitude, the calculation results will be inaccurate. You need to recalculate the calculation results based on the specific value of the inspired oxygen fraction. calculate.
Baidu Encyclopedia-Oxygenation Index