A patient is receiving mechanical ventilation. The following…

A patient is receiving mechanical ventilation. The following arterial blood gas results are reported on an FIO2 of 0.60:pH                     7.40PaCO2                  41 torrPaO2                    47 torrHCO3               25 mEq/LBE                    +1 mEq/LThe respiratory therapist should first recommend which of the following?