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→What is the oxygen concentration in the diluted CPAP circuit?
Note that the design leak rate for any mask at a given pressure does not increase with an oxygen bleed, so CPAP air volume (Vcpap) must be reduced by the amount of flow from the oxygen generator in L/min, which gives us the following:
'''Determination of FiO2 (fraction of inspired oxygen) with CPAP:'''<br>
FiO2=((Oxygen Flow L/min x 100%) + (Vcpap L/min - Oxygen Flow L/min) x 21% O2)) / Vcpap
therefore:<br>
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