The nurse reviews the arterial blood gas (ABG) results of a client and notes the results: pH 7.46 pH units, [normal range: 7.35-7.45] Paco2 of 30 mm Hg (30 mmol/L), [normal range: 35-45] HCO3- of 20 mEq/L (20 mmol/L). [normal range [22-26] When analyzing the client's ABG results, which condition would the nurse determine the client is experiencing?