Thirty minutes after intubation and initiation of mechanical ventilation, a patient's PaO2 = 55 mm Hg and the FIO2 = 0.5. To what should the FIO2 be set to obtain a PaO2 of 80 mm Hg?
a. 0.65
b. 0.75
c. 0.85
d. 0.95
ANS: B
Health Professions
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B. 
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