Effect of transversus abdominis plane block on chronic postoperative pain after inguinal hernia repair

Abstract

The aim of the study is to evaluate the effect of transversus abdominis plane block on chronic postoperative pain after inguinal hernia repair. Methods: Prospective randomized double blinded study is conducted on 40 male patients posted for inguinal hernia repair under spinal anaesthesia. Divided into 2 equal groups. Group I received USG TAP block with 20 ml of 0.25% bupivacaine whereas Group II received 20 ml of normal saline (Placebo) at the end of surgery. Postoperative VAS scores, analgesic consumption, DN4 scoring at 3 and 6 months to evaluate chronic pain were studied. Results: Forty male patients were enrolled. Postoperative VAS scores of Group I had improved scores than Group II. Analgesic consumption is also reduced in Group I compared to Group II (156.6  48.3 vs 282.1  43.2) which was statistically significant. Incidence of neuropathic pain in Group II was 5% at 3 months and 10% at 6 months; whereas in Group I one patient scored '3' at 3 months which reduced to '2' at 6 months. No restriction of daily activities present in Group I patient. Conclusion: USG TAP block provided better postoperative VAS scores and analgesic consumption, along with the reduction in incidence of chronic pain than placebo.