A PaO2 below what value would be considered moderate hypoxemia?
a. 75 mm Hg
b. 65 mm Hg
c. 55 mm Hg
d. Depends on the FiO2
ANS: C
A PaO2 of less than 40 mm Hg is called severe hypoxemia, a PaO2 of 40 to 59 mm Hg is called moderate hypoxemia, and a PaO2 of 60 mm Hg to the predicted normal is called mild hypox-emia.
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