Specimen Name Result Units Range

ABG pH 7.66 (7.36-7.44)
PaO2 75 mmHg (70-100)
PaCO2 32 mmHg (35-45)
HCO3- 35 mmol/L (21-26)

70yo male with exacerbation of CAL on IPPV.

What is the acid-base disorder?