Thirty Minutes After Intubation and Initiation of Mechanical Ventilation,a Patient's

Multiple Choice

Thirty minutes after intubation and initiation of mechanical ventilation,a patient's PaO₂ = 55 mm Hg and the F_IO₂ = 0.5.To what should the F_IO₂ be set to obtain a PaO₂ of 80 mm Hg?

A) 0.65
B) 0.75
C) 0.85
D) 0.95