title: A randomized controlled comparison of three quadruple therapy regimens in a population with low Helicobacter pylori eradication rates.
abstract: OBJECTIVE
  We sought to compare the efficacy and tolerability of an omeprazole/clarithromycin/bismuth/tetracycline-based quadruple therapy to that of a ranitidine/metronidazole/bismuth/tetracycline-based quadruple therapy of 2 or 3 weeks duration in a population with a high prevalence of metronidazole-resistant Helicobacter pylori and low triple therapy eradication rates.
  
  
  METHODS
  Two hundred and twenty-one patients who presented endoscopically proven duodenal ulcers and a positive rapid urease test were randomized to receive either: (i) omeprazole 20 mg b.i.d., clarithromycin 250 mg b.i.d., bismuth subcitrate 240 mg b.i.d. and tetracycline 500 mg b.i.d (OCBT) for 2 weeks; (ii) ranitidine 300 mg b.i.d., metronidazole 500 mg b.i.d, bismuth subcitrate 240 mg b.i.d. and tetracycline 500 mg b.i.d. (RMBT2) for 2 weeks; or (iii) ranitidine 300 mg b.i.d., metronidazole 500 mg b.i.d, bismuth subcitrate 240 mg b.i.d. and tetracycline 500 mg b.i.d. (RMBT3) for 3 weeks. Patients were interviewed 2 weeks after the completion of therapy to review compliance and side-effects. Eradication of H. pylori was assessed 8 weeks after the completion of therapy with the use of a 14C-urea breath test.
  
  
  RESULTS
  The per-protocol eradication rate was significantly higher with OCBT (88%) than RMBT2 (73%) or RMBT3 (71%) (P<0.05). The intent-to-treat eradication rate was numerically higher with OCBT (80%) than RMBT2 (68%) or RMBT3 (68%), although this difference did not reach statistical significance (P=0.09). Per-protocol or intent-to-treat eradication rates were similar with RMBT2 and RMBT3. There were significantly greater side-effects with the RMBT2 regimen.
  
  
  CONCLUSIONS
  The omeprazole/clarithromycin/bismuth/tetracycline-based quadruple therapy provides higher H. pylori eradication rates than the ranitidine/metronidazole/bismuth/tetracycline-based quadruple therapy when administered per protocol. The prolongation of the latter regimen from 2 to 3 weeks did not increase eradication rates.
authors.affiliation: Digestive Diseases Research Center, Shariati Hospital, Tehran University Of Medical Sciences, Iran.
authors.forename: R
authors.initials: R
authors.lastname: Sotudehmanesh
authors.forename: R
authors.initials: R
authors.lastname: Malekzadeh
authors.forename: A
authors.initials: A
authors.lastname: Fazel
authors.forename: S
authors.initials: S
authors.lastname: Massarrat
authors.forename: B
authors.initials: B
authors.lastname: Ziad-Alizadeh
authors.forename: M R
authors.initials: MR
authors.lastname: Eshraghian
mesh_terms: D000328:Adult; D000863:Antacids / Q000009:adverse effects / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000009:adverse effects / Q000627:therapeutic use; D000897:Anti-Ulcer Agents / Q000009:adverse effects / Q000627:therapeutic use; D001729:Bismuth / Q000009:adverse effects / Q000627:therapeutic use; D004359:Drug Therapy, Combination; D005260:Female; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori; D006801:Humans; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000188:drug therapy / Q000382:microbiology; D016896:Treatment Outcome
chemical_list: D000863:Antacids; D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D001729:Bismuth