Final answer:
Severe pain after receiving pain medication requires immediate nursing intervention to manage postoperative pain and prevent complications in a patient following hip surgery.
Step-by-step explanation:
The assessment requiring immediate nursing intervention is the report of severe pain 30 minutes after receiving pain medication. Postoperative pain is expected, but severe pain after medication suggests inadequate pain control, potential complications, or both. It is critical for nurses to assess and manage postoperative pain effectively to facilitate healing, prevent complications, and provide comfort. In the context of hip surgery, unmanaged pain may restrict patient mobility, which is essential to prevent life-threatening complications such as blood clots, pneumonia, and pressure sores that elderly patients are at significant risk for following such operations.