Background: Sequential and concomitant therapies are two innovative therapies for Helicobacter pylori (H. pylori) eradication. However, the comparative efficacy and safety of these treatments are controversial. Therefore, we aimed to conduct an updated systematic review and meta-analysis of studies that compared these two treatments.
Methods: A search of PubMed, Embase, the Cochrane Library, and Web of Science was carried out. Randomized controlled trials (RCTs) that compared sequential with concomitant therapies were selected for meta-analysis.
Results: Twenty RCTs were included in the analysis. The eradication rate of 10-day sequential therapy was superior to that of 5-day concomitant therapy (82.09 versus 77.79%, relative risk (RR) 1.052 (95% confidence interval (CI) 1.004-1.103), P = 0.035)), similar to that of 7-day concomitant therapy (82.40 versus 86.99%, RR 0.959 (95% CI 0.874-1.053), P = 0.382), and inferior to that of 10-day concomitant therapy (78.39 versus 83.32%, RR 0.945 (95% CI 0.907-0.984, P = 0.006); the occurrence of diarrhea was higher in 10-day concomitant therapy than that in 10-day sequential therapy. Compared with the eradication rate of sequential therapy, that of concomitant therapy was higher in metronidazole-resistant strains (RR 0.912 (95% CI 0.844-0.986, P = 0.020)) and strains resistant to metronidazole and clarithromycin (RR 0.542 (95% CI 0.308-0.956, P = 0.035)).
Conclusion: The efficacy of concomitant therapy was duration dependent, and 10-day concomitant therapy was superior to 10-day sequential therapy. Compared to sequential therapy, concomitant therapy was more efficacious for metronidazole-resistant strains and metronidazole plus clarithromycin-resistant strains. However, diarrhea was more frequent with concomitant therapy than with sequential therapy.
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