In a person breathing room air (and with all else being normal), if the alveolar PCO2 rises from 40 to 70 mm Hg, what would you expect?
a. PAO2 to fall by approximately 30 mm Hg
b. PAO2 to fall by approximately 40 mm Hg
c. PAO2 to rise by approximately30 mm Hg
d. PAO2 to rise by approximately 40 mm Hg
ANS: A
Based on the alveolar air equation, if the FiO2 remains constant, then the PAO2 must vary in-versely with the PACO2.
Health Professions
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