A patient is receiving 0.80 FIO2 with a barometric pressure at 760 mm Hg. PCO2 is at 68; PaO2 is 55. The PAO2 for this patient is _____ mm Hg

a. 395.6 c. 510.9
b. 485.4 d. 550.0


ANS: B
Formula: PAO2 = (PB – PH2O) FIO2 – PaCO2 (1.25).
PAO2 = (760 – 47) 0.80 – 68 (1.25).
PAO2 = 570.4 – 85.
PAO2 = 485.4 mm Hg.

Health Professions

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