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The objective of this study was to investigate the efficacy and safety of 10-day bismuth quadruple therapy with amoxicillin, tetracycline, or clarithromycin and different doses of rabeprazole for first-line treatment of Helicobacter pylori infection. This multicenter, randomized, parallel-controlled clinical trial was conducted between March 2013 and August 2014. A total of 431 H. pylori -infected patients with duodenal ulcers were enrolled and randomized into four treatment groups (1:1:1:1) for 10 days, as follows: (i) a group receiving a low dose of rabeprazole of 10 mg twice a day (b.i.d.) (LR dose) plus bismuth, amoxicillin, and clarithromycin (LR-BAC); (ii) a group receiving LR plus bismuth, amoxicillin, and tetracycline (LR-BAT); (iii) a group receiving a high dose of rabeprazole of 20 mg b.i.d. (HR dose) plus bismuth, amoxicillin, and clarithromycin (HR-BAC); and (iv) a group receiving HR-BAT. Antimicrobial susceptibility was assessed by the Etest method. The primary outcome was H. pylori eradication at 4 weeks after the treatment. The per-protocol (PP) eradication rates in the LR-BAC, LR-BAT, HR-BAC, and HR-BAT groups were 94.1%, 91.9%, 94.8%, and 91.9%, respectively, while the intention-to-treat (ITT) eradication rates in those groups were 87.2%, 87.2%, 87.7%, and 86%, respectively. There was no significant difference between the four groups in PP analysis ( P = 0.799) and ITT analysis ( P = 0.985). The efficacies of four-treatment therapy were not affected by antibiotic resistance. The adverse events in the four treatment groups were similar; central nervous system (CNS) and gastrointestinal symptoms were the most common reported. Bismuth-containing quadruple therapy with low-dose rabeprazole, amoxicillin, and tetracycline is a good option for first-line treatment of H. pylori infection in a population with high antibiotic resistance. (This study is registered at Chinese Clinical Trials Registry [www.chictr.org.cn] under number ChiCTR1800014832.).

antimicrobial agents and chemotherapy

Ten-Day Quadruple Therapy Comprising Low-Dose Rabeprazole, Bismuth, Amoxicillin, and Tetracycline Is an Effective and Safe First-Line Treatment for Helicobacter pylori Infection in a Population with High Antibiotic Resistance: a Prospective, Multicenter, Randomized, Parallel-Controlled Clinical Trial in China