What fractional inspired oxygen (FɪO₂)setting should be set on the ventilator when the patient currently has a partial pressure of oxygen (PₐO₂)of 53 mm Hg while receiving 50% oxygen and the desired PₐO₂ is 90 mm Hg?
A) 0.64
B) 0.74
C) 0.85
D) 0.95

Question

Quizplus · Accepted Answer

To determine the FɪO₂ setting on the ventilator, we can use the following formula:

FɪO₂ = (desired PₐO₂ ÷ current PₐO₂) × current FɪO₂

Plugging in the values given in the question, we get:

FɪO₂ = (90 ÷ 53) × 0.5 
FɪO₂ ≈ 0.85

Therefore, the FɪO₂ setting on the ventilator should be approximately 0.85 to achieve the desired PₐO₂ of 90 mm Hg. The correct answer is C.

What Fractional Inspired Oxygen (FɪO₂)setting Should Be Set on the Ventilator