A 24-yeаr-оld pаtient with musculаr dystrоphy is seen in the ED fоllowing a 2-day history of increasing shortness of breath. Blood gas analysis results obtained while the patient is breathing air are: pH 7.31PaCO2 65 torrPaO2 58 torrHCO3- 33 mEq/LBE +4 mEq/L A respiratory therapist should recommend