Effect of Epidural Patient-controlled Analgesia on Postoperative Pain After Lumbar Spinal Surgeries

This study included patients who underwent lumbar spine surgeries for degenerative spinal disease. The eligible patients were divided into two groups, the PCA group and the control group, for two types of postoperative pain management. The patients in the PCA group received 72-hour epidural PCA. The PCA catheter was inserted by the surgeon prior to wound closure in the lumbar spine surgery. The PCA catheter was maintained until 72 hours after the surgery and was removed at the postoperative day 4. The control group received postoperative standard pain treatment, including oral acetaminophen and muscle relaxants. No non-steroidal anti-inflammatory drugs were given in this study. All patients were provided the option to request intramuscular morphine injection (0.5 mg of morphine) for additional pain control, with a minimum interval of 6 hours between doses. Pain assessment was conducted using a visual analogue scale on the first four postoperative days and on the day of discharge. At the postoperative day 4, pain assessment was performed before the PCA removal. The level of pain and the number of morphine injections were compared between the two groups.