During mechanical ventilation of a patient with COPD, the PaO2 = 58 mm Hg and the FIO2 = 0.5. If the desired PaO2 is 65 mm Hg, the FIO2 needs to be changed to which of the following?
a. 0.44
b. 0.56
c. 0.65
d. 0.74
ANS: B
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