Conditions: Inguinal Hernia Postoperative Pain
Keywords: postoperative pain inguinal hernia chronic postsurgical pain cytokine preemptive analgesia patients with inguinal hernia scheduled for surgery
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 77
Healthy volunteers: no

Brief summary:
Inguinal hernia repair is one of the most frequently performed operations in young men. Persistent pain after inguinal surgery represents a significant cause of disability, occurring in between 15%-35% of cases. In a majority of these patients, their groin pain persisted after a previous hernia repair. The main type of chronic postsurgical pain is neuropathic, caused by injured nerves. One of the principal components in the pathophysiology of postsurgical pain is cytokines, specifically tumor necrosis factor (TNF). In animal studies, injecting TNF inhibitors before nerve injury can reduce pain behaviors and neuropathology. Finding a way to reduce the incidence of postsurgical pain after hernia repair could enhance function, and reduce the need for opioids and other analgesics. The investigators intend to conduct the first randomized, controlled study evaluating whether preemptive administration of a tumor necrosis inhibitor can reduce postoperative pain and opioid consumption after hernia repair. This is important because the degree and intensity of postsurgical pain is a major predictor for the development of chronic postsurgical pain.

Detailed description:
76 patients with an inguinal hernia scheduled for surgical repair will be randomized in a 1:1 ratio to receive either subcutaneous etanercept or saline before skin incision. The study will be double-blind (i.e. neither the surgeon, anesthesiologist, nor the person administering the injection will know which group they were assigned to). Group I will receive 50 mg of subcutaneous etanercept mixed in 1 ml sterile water 90-120" before skin incision. Group II will receive 1 ml of sterile water 90-120" before skin incision. The anesthesia and surgical procedures will be standardized. For the next 24 hours, patients will keep a q4 hour pain diary recording their average pain on a 0-10 numerical rating scale. They will also record the number of Percocet tablets they took. All patients will be seen 1 month after their surgery, where their average pain score, work status, and analgesic intake (if any) will be recorded. Patients will then be followed with a telephone follow-up 3, 6 and 12-months post-procedure, where the same variables will be recorded.

Arms:
arm 1: Etanercept 50 mg preoperatively arm 2: Subcutaneous saline preoperatively

Interventions: intervention 1: Etanercept intervention 2: Saline
Intervention descriptions: intervention 1: 50 mg subcutaenous preoperatively intervention 2: Given subcutaneously preoperatively

Protocol document: