Efficacy of transversus abdominis plane block on postoperative nausea and vomiting: a meta-analysis of randomized controlled trial.

"Declarations Ethics approval and consent to participateNot applicable. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding Not applicable."

"We conducted a meta-analysis to assess the effects of TAP block on PONV, as recommended by the PRISMA statement. The registration number of the study in PROSPERO is CRD42023420414. Ethical approval and patient consent are not required in a meta-analysis. Since very few patients vomit without experiencing nausea, and the incidence rates of PONV and postoperative nausea (PON) are similar, we consider PONV as a surrogate for PON if PONV is not reported in a trial. We evaluated nausea values in cases where PONV or PON occurred. The most commonly used time interval to measure the role of antiemetic is 24 h, when only longer or shorter time interval was reported, we utilized the interval closest to the 24-hour period. Nausea was assessed using a categorical scoring system (0 = none, 1 = mild, 2 = moderate, 3 = severe)."