A client with chronic obstructive pulmonary disease (COPD) is admitted for a nonemergent cholecystectomy. The admission arterial blood gas (ABG) findings are a pH 7.35, PaCO2 48 mm Hg, and a HCO3- 28 mEq/L (28 mmol/L). Based on these results, which intervention should the nurse implement? Reference Range: Arterial Blood Gas (ABG) pH [7.35 to 7.45] PaCO2 [35 to 45 mm Hg] HCO3- [21 to 28 mEq/L (21 to 28 mmol/L)]