A 60-year-old man with chronic obstructive pulmonary disease (COPD) presents with increasing shortness of breath and confusion. His arterial blood gas (ABG) results are as follows:pH: 7.32 (7.35-7.45)PaCO2: 7.3 kPa (4.6-6.4)HCO3-: 29 (22- 28)What is the most likely primary acid-base disorder?
