Analgesia and discharge following preincisional ilioinguinal and iliohypogastric nerve block combined with general or spinal anaesthesia for inguinal herniorrhaphy

Abstract

Background: Preincisional ilioinguinal and iliohypogastric nerve block (IINB) reduces postoperative analgesics after inguinal herniorrhaphy. The effect of an IINB on postoperative pain and discharge profile was therefore studied in day-surgery patients undergoing inguinal herniorrhaphy with general or spinal anaesthesia.

Methods: Seventy ASA I-II adult patients scheduled for inguinal herniorrhaphy received an IINB before the surgical incision with 15 ml of 0.5% bupivacaine. In a randomized fashion half of them received general anaesthesia with spontaneous breathing via a laryngeal mask (GA-group) and the other half received spinal anaesthesia with 5 mg of bupivacaine diluted with sterile water to 2.5-ml volume (SPIN-group). In the postanaesthesia care unit (PACU), pain was assessed on a scale from 0 to 10 (VAS) and ketorolac 30 mg i.v. (VAS < 5), or fentanyl 0.05 mg i.v. (VAS > or = 5) was administered as scheduled. In the day surgery unit and at home the analgesic was a tablet of ibuprofen 200 mg + codeine 30 mg (VAS > or = 3).

Results: Patients in the SPIN-group reported lower postoperative pain scores at 30, 60 min (P < 0.0001) and 120 min (P < 0.05) after surgery, and longer time to first analgesic use (P < 0.0001). Patients in the GA-group had a shorter time to discharge without voiding (P < 0.001) and with voiding (P < 0.05). After discharge, there were no significant differences between the groups regarding pain scores at rest and at walking, or the doses of analgesic. Adverse events were rare in both groups.

Conclusion: Only a relatively short immediate analgesic benefit could be demonstrated by a combination of IINB with spinal anaesthesia compared with IINB combined with general anaesthesia. The use of general anaesthesia facilitated an earlier postoperative discharge than spinal anaesthesia.