title: Influence of anti-ulcer drugs used in Japan on the result of (13)C-urea breath test for the diagnosis of Helicobacter pylori infection.
abstract: BACKGROUND
  The (13)C-urea breath test (UBT) is a simple breath test for the diagnosis of Helicobacter pylori infection, but several factors have been reported to affect the results of this test. In this study, the effects of the antiulcer drugs used in Japan on the results of UBT were determined.
  
  
  METHODS
  The subjects of the study were 64 adult volunteers who tested positive for H. pylori infection by the serum antibody method. Eight classes of anti-ulcer drugs used in Japan were administered at their usual doses to these subjects: lansoprazole, a proton pump inhibitor (PPI); nizatidine, an H(2)-receptor antagonist (H(2)RA); and polaprezinc, ecabet sodium, rebamipide, teprenone, cetraxate hydrochloride, and sucralfate, all mucoprotective agents. The study drugs were randomized for administration to the subjects, and each of the drugs was administered for 14 consecutive days. The UBT was performed on days 0, 14, and 21.
  
  
  RESULTS
  The mean Delta(13)C per thousand in the lansoprazole group was significantly decreased on day 14, to below 10 per thousand, in 4 of 16 subjects, and in 1 of the 4 subjects, the test result was negative, with the Delta(13)C per thousand falling to 1.7 per thousand. The value returned to baseline 1 week after the discontinuation of lansoprazole. The other drugs administered had no significant effect on the result of the UBT, except that the mean Delta(13)C per thousand showed a tendency to decrease after the administration of ecabet sodium and rebamipide.
  
  
  CONCLUSIONS
  Administration of a PPI may produce a false-negative UBT result, while other anti-ulcer drugs, for the most part, have little effect on the result of the UBT when used alone. The (13)C-urea breath test (UBT) is a simple test for the diagnosis of Helicobacter pylori infection, but several factors have been reported to affect the results of this test. In this study, the effects of the anti-ulcer drugs used in Japan on the results of the UBT were determined.
authors: Second Department of Internal Medicine, Oita Medical University, 1-1 Hasama, 879-5593 Oita, Japan.
authors: Kazunari
authors: K
authors: Murakami
authors: Ryugo
authors: R
authors: Sato
authors: Tadayoshi
authors: T
authors: Okimoto
authors: Koichiro
authors: K
authors: Watanabe
authors: Masaru
authors: M
authors: Nasu
authors: Toshio
authors: T
authors: Fujioka
authors: Masaaki
authors: M
authors: Kodama
authors: Jiro
authors: J
authors: Kagawa
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000328:Adult; D000897:Anti-Ulcer Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D001944:Breath Tests; D002250:Carbon Radioisotopes / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005188:False Negative Reactions; D005260:Female; D016481:Helicobacter Infections / Q000175:diagnosis* / Q000188:drug therapy* / Q000382:microbiology; D016480:Helicobacter pylori / Q000187:drug effects*; D006635:Histamine H2 Antagonists / Q000008:administration & dosage; D006801:Humans; D007564:Japan / Q000453:epidemiology; D064747:Lansoprazole; D008297:Male; D008875:Middle Aged; D016567:Nizatidine / Q000008:administration & dosage; D009853:Omeprazole / Q000008:administration & dosage / Q000031:analogs & derivatives*; D054328:Proton Pump Inhibitors; D017494:Proton Pumps / Q000008:administration & dosage; D013997:Time Factors; D016896:Treatment Outcome; D014508:Urea / Q000378:metabolism
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000897:Anti-Ulcer Agents; D002250:Carbon Radioisotopes; D006635:Histamine H2 Antagonists; D054328:Proton Pump Inhibitors; D017494:Proton Pumps; D064747:Lansoprazole; D014508:Urea; D009853:Omeprazole; D016567:Nizatidine