title: How to eradicate Helicobacter pylori using amoxicillin and omeprazole in the remnant stomach.
abstract: OBJECTIVE
  We previously investigated the effects of amoxicillin/omeprazole combined therapy on patients who were Helicobacter pylori (H. pylori) positive after gastrectomy for the treatment of gastric cancer, and we determined the difference in amoxicillin dosage between the therapeutic successes and failures. In the present study, assuming that amoxicillin dosage should be determined on the basis of body weight of each patient, we examined whether the eradication of H. pylori would be improved by using this novel dose-selection method.
  
  
  METHODS
  We have previously reported about eradication of H. pylori of remnant stomach as follows. Patients who underwent gastrectomy for the treatment of gastric cancer were enrolled if H. pylori was detected in their remnant stomach after the operation. Of these patients, 22 were treated with amoxicillin at 750 mg/day for 2 weeks and omeprazole at 20 mg/day for 8 weeks. For the evaluation of H. pylori eradication, endoscopic examination and 13C-urea breath test were performed 12 weeks after the initiation of the treatment. The amoxicillin dosage in the therapeutic successes was compared with that in the therapeutic failures, and we found that the dosage was 14.1 +/- 1.5 and 12.5 +/- 1.5 mg/kg/day in the successes and the failures, respectively. Following these results, another 10 H. pylori-positive patients were treated with amoxicillin greater than 16 mg/kg/day for 2 weeks and omeprazole at 20 mg/day for 8 weeks, and H. pylori eradication was evaluated as mentioned above. The efficacy of the drug therapy on H. pylori infection was compared between the two groups that one group (Group A) is treated with amoxicillin 750 mg/day for 2 weeks and omeprazole at 20 mg/day for 8 weeks and the other group (Group B) is treated with 1250 mg/day for 2 weeks and omeprazole at 20 mg/day for 8 weeks.
  
  
  RESULTS
  The eradication rate of H. pylori in Group B (84.6%) was higher than that in Group A (42.1%). There was significant difference between the two groups (p = 0.028).
  
  
  CONCLUSIONS
  We assumed that the optimal dosage of amoxicillin was over 15.6 mg/kg/day for omeprazole-amoxicillin combined therapy for gastrectomized patients who were H. pylori positive, and the favorable therapeutic effects could be obtained by applying this amoxicillin dosage to the eradication of H. pylori.
authors.affiliation: 1st Department of Surgery, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama City, 236-0004, Japan. rino@med.yokohama-cu.ac.jp
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Rino
authors.forename: Toshio
authors.initials: T
authors.lastname: Imada
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kabara
authors.forename: Makoto
authors.initials: M
authors.lastname: Takahashi
authors.forename: Manabu
authors.initials: M
authors.lastname: Shiozawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohshima
authors.forename: Kimiatsu
authors.initials: K
authors.lastname: Hasuo
authors.forename: Masaaki
authors.initials: M
authors.lastname: Inaba
authors.forename: Katsuya
authors.initials: K
authors.lastname: Yoneyama
authors.forename: Takaki
authors.initials: T
authors.lastname: Yoshikawa
authors.forename: Hiroo
authors.initials: H
authors.lastname: Yukawa
authors.forename: Masakazu
authors.initials: M
authors.lastname: Kawamoto
authors.forename: Makoto
authors.initials: M
authors.lastname: Tokunaga
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Takanashi
mesh_terms: D000658:Amoxicillin / Q000008:administration & dosage*; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D000897:Anti-Ulcer Agents / Q000008:administration & dosage*; D001706:Biopsy; D001944:Breath Tests; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004359:Drug Therapy, Combination; D005260:Female; D005753:Gastric Mucosa / Q000382:microbiology / Q000473:pathology; D018530:Gastric Stump / Q000473:pathology; D005756:Gastritis / Q000175:diagnosis / Q000188:drug therapy* / Q000473:pathology; D005773:Gastroscopy; D016481:Helicobacter Infections / Q000175:diagnosis / Q000188:drug therapy* / Q000473:pathology; D016480:Helicobacter pylori / Q000187:drug effects; D006801:Humans; D008297:Male; D009853:Omeprazole / Q000008:administration & dosage*; D011446:Prospective Studies; D017211:Treatment Failure; D016896:Treatment Outcome; D014508:Urea
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D000658:Amoxicillin; D014508:Urea; D009853:Omeprazole