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Hye-Kyung Jung, Seung Joo Kang, Yong Chan Lee, Hyo-Joon Yang, Seon-Young Park, Cheol Min Shin, Sung Eun Kim, Hyun Chul Lim, Jie-Hyun Kim, Su Youn Nam, Woon Geon Shin, Jae Myung Park, Il Ju Choi, Jae Gyu Kim, and Miyoung Choi, Korean College of Helicobacter and Upper Gastrointesinal Research. Gut and Liver -0001;0:. https://doi.org/10.5009/gnl20288

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Background: Previous studies on the effect of Helicobacter pylori eradication on functional dyspepsia (FD) are conflicting. We performed a comprehensive meta-analysis on this issue according to region and prevalence of H. pylori. Methods: Randomized controlled trials (RCTs) evaluating the effect of eradication of H. pylori on functional dyspepsia up to December 2018 were searched through PubMed, EMBASE, and the Cochrane Library. Subgroup analyses by the outcome measure, region, and prevalence of H. pylori were performed. All data were analyzed with Review Manager 5.3. Results: Eighteen RCTs were included in our meta-analysis. Overall, the H. pylori eradication group showed significant improvement of symptoms compared with the control group (risk ratio (RR) = 1.18; 95% confidence interval (CI): 1.07–1.30, p < 0.01). There was moderate heterogeneity among studies (I² = 34%) and the number needed to treat (NNT) was 15.0. Helicobacter pylori eradication improved dyspeptic symptoms both in low (<50%) and high (≥50%) H. pylori prevalence regions (RR = 1.21 and 1.17; 95% CI: 1.02–1.44 and 1.06–1.29, I² = 49% and 5%, respectively.) In the analysis of studies from Asia, however, the effect of eradication on improvement of dyspepsia was not significant (RR = 1.14; 95% CI: 0.99–1.33, p = 0.08, I² = 37%). Conclusion: Overall, H. pylori eradication provides significant improvement of symptoms in functional dyspepsia patients regardless of H. pylori prevalence. However, in the analysis of studies from Asia, the eradication did not significantly improve dyspeptic symptoms. In this region, eradication for dyspepsia can be individualized.