A nurse is caring for a patient receiving morphine sulfate via patient-controlled analgesia (PCA) pump for postoperative pain management. Which nursing intervention is the priority when monitoring this patient?

• 1 Encourage the patient to use the PCA pump every 15 minutes to maintain adequate pain control
• 2 Monitor the patient's pain level using a 0-10 numeric rating scale every 2 hours
• 3 Assess the patient's respiratory rate, depth, and oxygen saturation every 15 minutes initially ✓ 정답
• 4 Educate the patient about the importance of early ambulation to prevent complications

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