A 75-year-old, 5-foot, 7-inch female patient with an exacerb…

A 75-year-old, 5-foot, 7-inch female patient with an exacerbation of COPD is placed on the following NPPV settings: IPAP = 8 cm H2O, EPAP = 4 cm H2O, rate = 12 breaths/min, FIO2 = 0.3. The resulting VT is 255 mL. An arterial blood gas sample is drawn 1 hour later, and the results are: pH = 7.33, PaCO2 = 70 mm Hg, PaO2 = 58 mm Hg, HCO3- = 35 mEq/L. What action should the respiratory therapist take at this time?