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This equation computes the alveolar partial pressure of oxygen from data that is practically measurable. The Alveolar Gas Equation uses assumptions to calculate the partial pressure of oxygen in the pulmonary alveolus because it is not practical to take a sample of gas from the alveoli to directly measure the partial pressure of oxygen.
CONTENTS
APPLICATIONS
This equation is used in a clinical environment to calculate the partial pressure of oxygen in the pulmonary alveoli in a patient.
INPUTS
The following describes the inputs to this equation:
- FIO2 = Oxygen in Expired Air
- BP = Barometric Pressure
- WVP = Water Vapor Pressure
- PaCO2 = Arterial Partial Pressure
- R = Respiratory Quotient
EXAMPLES
To perform the following task/analysis/calculation ...
HISTORY
This equation was first described in 1946 in a paper written by Fehn, Rahn, and Otis.
NOTES
This equation is an approximation that is used when FIO2 is small ( FIO2 [1 - RQ] < 1)
The more definitive equation can be used here:
https://www.vcalc.com/app/equations/e6d2a3d4-da27-11e2-8e97-bc764e04d25f
REFERENCE
[1] Alveolar Gas Equation
Source: Wikipedia
URL: http://en.wikipedia.org/wiki/Alveolar_gas_equation
Public License: < CC Attribution-ShareAlike 3.0 International >
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