title: Helicobacter pylori augments the pH-increasing effect of omeprazole in patients with duodenal ulcer.
abstract: OBJECTIVE
  Omeprazole is less effective in healthy subjects than in patients with duodenal ulcers. The aim of this study was to determine whether Helicobacter pylori augments the pH-increasing effect of omeprazole in patients with duodenal ulcers.
  
  
  METHODS
  In 16 patients with duodenal ulcers, baseline intragastric acidity was measured before and 4-6 weeks after the cure of H. pylori infection. In 17 patients with duodenal ulcers, 24-hour pH metry was performed during treatment with 20 mg omeprazole once daily before as well as after eradication of H. pylori. Intragastric acidity was measured using a glass electrode placed 5 cm below the cardia. H. pylori infection was assessed by [13C] urea breath test, culture, histology, and rapid urease test.
  
  
  RESULTS
  H. pylori eradication resulted in marked decrease of the pH-increasing effect of omeprazole (24-hour median gastric pH, 5.5 vs. 3.0; P<0.002) that was most pronounced during nighttime (median gastric pH, 6.4 vs. 2.1; P=0.001). On the other hand, baseline intragastric pH remained unchanged after eradication (median gastric pH, 1.0 vs. 1.1; P=0.5).
  
  
  CONCLUSIONS
  In patients with duodenal ulcers treated with omeprazole, intragastric pH depends significantly on the presence or absence of H. pylori, whereas baseline pH remained unchanged after H. pylori eradication.
authors.affiliation: Department of Internal Medicine, Elisabeth Hospital, Essen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Labenz
authors.forename: B
authors.initials: B
authors.lastname: Tillenburg
authors.forename: U
authors.initials: U
authors.lastname: Peitz
authors.forename: J P
authors.initials: JP
authors.lastname: Idström
authors.forename: E F
authors.initials: EF
authors.lastname: Verdú
authors.forename: M
authors.initials: M
authors.lastname: Stolte
authors.forename: G
authors.initials: G
authors.lastname: Börsch
authors.forename: A L
authors.initials: AL
authors.lastname: Blum
mesh_terms: D000328:Adult; D000368:Aged; D000897:Anti-Ulcer Agents / Q000627:therapeutic use*; D004381:Duodenal Ulcer / Q000188:drug therapy* / Q000209:etiology / Q000378:metabolism; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D005745:Gastric Acidity Determination; D005756:Gastritis / Q000209:etiology; D016481:Helicobacter Infections / Q000150:complications / Q000188:drug therapy; D016480:Helicobacter pylori / Q000502:physiology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000627:therapeutic use*
chemical_list: D000897:Anti-Ulcer Agents; D009853:Omeprazole