A patient is receiving 0.60 FIO2 with a barometric pressure of 755 mm Hg. PCO2 is 56 mm Hg and PaO2 65 mm Hg. The PAO2 for this patient is _____ mm Hg
a. 265.6 c. 354.8
b. 300.9 d. 404.0
ANS: C
Formula: PAO2 = (PB – PH2O) FIO2 – PaCO2 (1.25).
PAO2 = (755 – 47) 0.60 – 56 (1.25).
PAO2 = 424.8 – 70.
PAO2 = 354.8 mm Hg.
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