The partial pressure of alveolar oxygen (PAO2) when the atmospheric pressure is 3 atmospheric pressure (atm), the PACO2 is 40 mm Hg, and the FIO2 is 0.80 is _____ mm Hg
a. 2280 c. 1736
b. 1784 d. 1500
ANS: C
PAO2 = (Pbar – PH2O) FIO2 – PaCO2 ÷ 0.8; Pbar = 3 atm ? 760 = 2280 mm Hg.
PAO2 = (2280 – 47)0.8 – 40 ÷ 0.8.
PAO2 = 1786.4 – 50 = 1736.4 mm Hg.
Health Professions
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