title: Assessment of a new triple agent regimen for the eradication of Helicobacter pylori and the nature of H. pylori resistance to this therapy in Japan.
abstract: BACKGROUND
  Multiple regimens for the eradication of Helicobacter pylori have been tested, but the best therapy has not been determined yet. To determine the efficacy of a new triple agent regimen using a combination of lansoprazole, amoxicillin, and clarithromycin against Helicobacter pylori (H. pylori), and to examine H. pylori resistance to this therapy in ineffective cases.
  
  
  METHODS
  We studied a total of 71 patients infected with H. pylori who had gastric ulcer (n = 37) or duodenal ulcer (n = 34) as confirmed by endoscopy. Patients received 1500 mg amoxicillin, 400 mg clarithromycin and 30 mg lansoprazole for 2 weeks followed by 30 mg lansoprazole for 6 weeks in patients with gastric ulcer or for 4 weeks in those with duodenal ulcer. Endoscopic examination was performed before treatment and at 1 month, 2 months, and 5 months after initiating treatment to check the status of ulceration and H. pylori infection.
  
  
  RESULTS
  The eradication rate of H. pylori was 92% (CI, 83-100%) in the gastric ulcer group and 94% (CI, 86-100%) in the duodenal ulcer group at 5 months, as determined by per-protocol analysis. Resistance to clarithromycin was present in 1 of 71 (1%) patients before treatment and in 2 of 5 (40%) patients after treatment. No resistance to amoxicillin and lansoprazole was found in patients before or after treatment. The resistance to clarithromycin changed during the observation period.
  
  
  CONCLUSIONS
  The new triple agent regimen was effective against H. pylori. Resistance to clarithromycin may not be permanent and it might be one of the risk factors which affect the efficacy of a clarithromycin-based therapy.
authors.affiliation: Department of Internal Medicine IV, University of Tokyo School of Medicine, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Mine
authors.forename: I
authors.initials: I
authors.lastname: Kobayasi
authors.forename: T
authors.initials: T
authors.lastname: Fujita
mesh_terms: D000328:Adult; D000368:Aged; D000658:Amoxicillin / Q000627:therapeutic use; D000897:Anti-Ulcer Agents / Q000627:therapeutic use*; D002169:Campylobacter Infections / Q000188:drug therapy*; D017291:Clarithromycin / Q000627:therapeutic use; D018432:Drug Resistance, Multiple; D004359:Drug Therapy, Combination / Q000627:therapeutic use*; D004381:Duodenal Ulcer / Q000188:drug therapy / Q000382:microbiology; D005260:Female; D016480:Helicobacter pylori / Q000187:drug effects*; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000627:therapeutic use*; D013276:Stomach Ulcer / Q000188:drug therapy / Q000382:microbiology
chemical_list: D000897:Anti-Ulcer Agents; D000658:Amoxicillin; D017291:Clarithromycin; D009853:Omeprazole