A 34 y/o male patient in the ICU is receiving NIPPV (BiPAP)…

A 34 y/o male patient in the ICU is receiving NIPPV (BiPAP) by full face mask. The following BiPAP settings and ABG results are below.                FiO2    50%                IPAP    14 cmH2O                EPAP   5   cmH2O                Spontaneous Respiratory Rate 12 ABG: PH 7.29 PaCO2 51 PaO2 83 HCO3 23 BE -1 Which of the following changes would you recommend to the physician?