Final answer:
When a client receiving patient-controlled epidural analgesia (PCEA) reports back pain, the nurse should assess for epidural hematoma.
Step-by-step explanation:
When a client receiving patient-controlled epidural analgesia (PCEA) following abdominal surgery reports experiencing back pain, the nurse should assess for epidural hematoma. Epidural hematoma is a potential complication of epidural analgesia that can cause back pain and requires immediate medical attention. By assessing for epidural hematoma, the nurse can ensure timely intervention and prevent further complications.