A 28-year-old female patient is being mechanically ventilate…

A 28-year-old female patient is being mechanically ventilated in BiLevel mode at the following settings: Rate: 22 PEEP High: 16 cmH2O PEEP Low: 8 cmH2O Time High: 2.8 seconds Pressure support: 10 cmH2O FiO2: 1.0 ABGs reveal the following: pH 7.36, PaCO2 42 torr, PaO2 65 torr, HCO3 26 mEq/L. Which of the following changes is most appropriate?