The alveolar air equation for all normal values is 306.5mmHg.
The alveolar gas equation is a formula used to evaluate the approximate partial pressure of oxygen in the alveolus.
The alveolar air equation is given as:
PAO2=FiO2 (PATM – PH2O) – PaCO2/RQ
PCO2 is partial pressure of carbon dioxide.
PAO2 is partial pressure of oxygen.
PATM is atmospheric pressure.
RQ is respiratory quotient
It is given that FIO2 is 0.5.
Normal value of PCO2 is 40mmHg.
PH2O is 47 mmHg.
RQ = 0.8
PATM is 760 mmHg
Using values,
PAO2=0.5 (760 – 47) – 40/0.8
=306.5mmHg
Hence, the alveolar air equation for all normal values is 306.5mmHg.
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