Purpose: Compare and evaluate the effectiveness of transversus abdominis plane (TAP) block versus intrathecal morphine (ITM) on elective postcesarean section pain, opioid consumption, and related side effects.
Design: Systematic review and meta-analysis.
Methods: A search for evidence was conducted in PubMed, Google Scholar, CINAHL, Cochrane Collaboration Database, UpToDate, Health Source, and gray literature. Only randomized controlled trials (RCTs) were included in the study. The methodological quality of evidence assessment was conducted using the Risk of Bias and Grades of Recommendation, Assessment, Development, and Evaluation system. The meta-analysis used Review Manager (RevMan 5.4, The Cochrane Collaboration).
Findings: A total of 11 RCTs involving 1,129 patients were analyzed. Compared to ITM, TAP has a similar effect on static (mean difference [MD]; 0.37; 95% confidence interval [CI], -0.04 to 0.79; P = .08) and dynamic pain scores (MD, 0.43; 95% CI, -0.06 to 0.92; P = .09) within the first 48 hours after surgery. Additionally, the TAP block had a lower incidence of postoperative nausea and vomiting (risk ratio, 0.45; 95% CI, 0.31 to 0.66; P < .0001) and increased opioid consumption (MD, 6.78; 95% CI, 3.79 to 9.77; P < .00001). Overall, TAP block and ITM did not differ in the time to first to rescue analgesia, incidence of sedation, and pruritus.
Conclusions: Evidence suggests that TAP blocks are equivalent to ITM in pain scores and more effective at lowering the incidence of postoperative nausea and vomiting, yet ITM has been shown to be more effective in reducing postoperative opioid consumption.
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