Regional block anesthesia for adult patients with inguinal hernia repair: A systematic review

Inguinal hernia repair (IHR) is a common surgical technique performed under regional block anesthesia (RBA). Although previous clinical trials have explored the effectiveness and safety of RBA for IHR, no systematic review has investigated its effectiveness and safety in adult patients with IHR. METHODS: This systematic review searched electronic databases (PubMed, Embase, Cochrane Library, CNKI, Wangfang, and VIP) from their inception to July 1, 2022. We included all potential randomized controlled trials that focused on the effects and safety of RBA in adult patients with IHR. Outcomes included operative time, total rescue analgesics, numerical rating scale at 24 hours, occurrence rate of nausea and vomiting, and occurrence rate of urinary retention (ORUCR). RESULTS: Five randomized controlled trials, involving 347 patients with IHR, were included in this study. Meta-analysis results showed that no significant differences were identified on operative time (MD = −0.20; fixed 95% confidence interval [CI], −3.87, 3.47; P = .92; I² = 0%), total rescue analgesics (MD = −8.90; fixed 95% CI, −20.36, 2.56; P = .13; I² = 28%), and occurrence rate of nausea and vomiting (MD = 0.39; fixed 95% CI, 0.13, 1.16; P = .09; I² = 0%) between 2 types of anesthesias. However, significant differences were detected in the numerical rating scale at 24 hours (MD = −1.53; random 95% CI, −2.35, −0.71; P < .001; I² = 75%) and ORUCR (MD = 0.20; fixed 95% CI, 0.05, 0.80; P = .02; I² = 0%) between the 2 management groups. CONCLUSION: The results of this study demonstrated that IHR patients with RBA benefit more from post-surgery pain relief at 24h and a decrease in the ORUCR than those with CSA.