An adult patient in respiratory failure has the following blood gases on a nasal cannula at 5 L/min: pH = 7.20; PaCO2 = 67 mm Hg; HCO3–= 27 mEq/L; PaO2 = 89 mm Hg
The attending physician orders intubation and ventilatory support. What FiO2 would you rec-ommend to start with?
a. 0.21
b. 0.30
c. 0.50
d. 0.90
ANS: C
Patients who have undergone previous blood gas measurement or oximetry who are doing well clinically and patients with disease states or conditions that normally respond to low to moderate concentrations of O2 may begin ventilation with 50% to 70% O2.
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