title: Influence of lansoprazole, famotidine, roxatidine and rebamipide administration on the urea breath test for the diagnosis of Helicobacter pylori infection.
abstract: OBJECTIVE
  The sensitivity of the urea breath test (UBT) has been reported to be influenced by the administration of omeprazole, lansoprazole and ranitidine. However, it is unclear whether other H2 receptor antagonists (H2RA), except ranitidine, and rebamipide, a mucosal protective agent, affect UBT sensitivity. The aim of this study is to clarify the effects of lansoprazole, famotidine, roxatidine and rebamipide administration on UBT sensitivity.
  
  
  METHODS
  Subjects comprised 30 volunteers with Helicobacter pylori infection. All subjects were examined by the 13C-UBT on four occasions: (i) without medication (control); (ii) after the administration of 30 mg lansoprazole (u.i.d) for 14 days; (iii) after the administration of 100 mg rebamipide (t.i.d) for 14 days; and (iv) after the administration of 20 mg famotidine or 75 mg roxatidine (b.i.d) for 14 days. In the H2RA study, individuals were randomized into two groups of 15 subjects and were administered either famotidine or roxatidine.
  
  
  RESULTS
  Five of the 30 cases administered lansoprazole and one of the 15 cases given roxatidine gave a false-negative UBT result. No negative UBT results were observed in patients administered famotidine or rebamipide.
  
  
  CONCLUSIONS
  Patients showing negative UBT results during the administration of proton pump inhibitors and H2RA should be re-examined after the cessation of these drugs to confirm the true negativity of H. pylori infection.
authors.affiliation: Department of Internal Medicine II, Shimane Medical University, Izumo, Japan. kadachi@shimane-med.ac.jp
authors.forename: Kyoichi
authors.initials: K
authors.lastname: Adachi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Fujishiro
authors.forename: Takafumi
authors.initials: T
authors.lastname: Mihara
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Komazawa
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Kinoshita
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000328:Adult; D000409:Alanine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000897:Anti-Ulcer Agents / Q000627:therapeutic use*; D001944:Breath Tests / Q000379:methods; D005188:False Negative Reactions; D015738:Famotidine / Q000627:therapeutic use; D005260:Female; D016481:Helicobacter Infections / Q000175:diagnosis* / Q000188:drug therapy*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D064747:Lansoprazole; D008297:Male; D009853:Omeprazole / Q000031:analogs & derivatives / Q000627:therapeutic use; D010880:Piperidines / Q000627:therapeutic use; D011237:Predictive Value of Tests; D015363:Quinolones / Q000627:therapeutic use; D014508:Urea / Q000032:analysis
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000897:Anti-Ulcer Agents; D010880:Piperidines; D015363:Quinolones; D064747:Lansoprazole; D015738:Famotidine; D014508:Urea; D009853:Omeprazole; C052785:rebamipide; D000409:Alanine; C053742:roxatidine acetate