A nurse is caring for a client whose arterial blood gas results show a pH of 7.3 and a PaCO2 of 50 mm Hg. The nurse should identify that the client is experiencing which of the following acid-base imbalances?

Rationale: A. The pH of 7.3 indicates acidemia (normal range 7.35–7.45). The PaCO2 of 50 mm Hg is elevated (normal 35–45 mm Hg), indicating a respiratory cause. This combination is consistent with respiratory acidosis. B. Respiratory alkalosis would present with a high pH and low PaCO2. C. Metabolic acidosis would show a low pH and low HCO3-. D. Metabolic alkalosis would show a high pH and elevated HCO3-.