A patient is receiving 0.30 FIO2 with a barometric pressure at 750 mm Hg. The partial pressure of carbon dioxide (PCO2) for this patient is 70 mm Hg; the partial pressure of arterial oxygen (PaO2) is 60 mm Hg. The PAO2 for this patient is _____ mm Hg
a. 100.2 c. 160.0
b. 123.4 d. 181.7
ANS: B
Formula: PAO2 = (Barometric pressure [PB] – pressure of water vapor [PH2O]) FIO2 – PaCO2 (1.25).
PAO2 = (750 mm Hg – 47) 0.30 – 70 (1.25).
PAO2 = 210.9 – 87.5.
PAO2 = 123.4 mm Hg.
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