A 50 kg (110 lb) patient is mechanically ventilated with the…

A 50 kg (110 lb) patient is mechanically ventilated with the following settings: A/C VC, VT 400 mL, RR 14/min, PEEP 10 cmH2O, and FiO2 of 60%. The chest x-ray demonstrates diffuse bilateral radiopacitiy. ABG results are: pH 7.36, PaCO2 47, PaO2 50, HCO3- 26. The respiratory therapist should increase the: