A 65 year-old female patient with advanced emphysema comes to the ED and is placed on a nasal cannula at 6 L/min. On inspection, the respiratory therapist finds that the patient has become drowsy and less responsive since the oxygen therapy was initiated an hour ago. ABG on 6 L/min are: pH 7.33, PaCO2 64 torr, PaO2 85 torr, HCO3 35 mEq/L. Which of the following should the therapist recommend?
A. Leave the patient on the cannula and continue to monitor.
B. Change to a 24% Venti-mask and repeat ABG.
C. Change to a simple oxygen mask and repeat ABG.
D. Prepare the patient for
Ans: B. Change to a 24% Venti-mask and repeat ABG.
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