title: Effects of omeprazole and lansoprazole on 24-hour intragastric pH in Helicobacter pylori-positive volunteers.
abstract: BACKGROUND
  The comparative effects of omeprazole and lansoprazole on gastric acidity in Helicobacter pylori-positive subjects and the clearance of H. pylori are unknown.
  
  
  METHODS
  Eighteen asymptomatic H. pylori-positive subjects were studied. Each volunteer received 7 days of omeprazole, lansoprazole, or placebo in a randomized, double-blind, crossover study, with a washout period of 4-6 weeks between treatments. At the end of each treatment period 24-h dual-point intragastric pH-metry was performed, and H. pylori clearance was assessed.
  
  
  RESULTS
  Both omeprazole (corpus/antrum pH: 5.5/5.5) and lansoprazole (5.4/5.4) increased intragastric pH compared with placebo (1.5/1.3). Over the 24-h recording there was no difference between the two treatments with regard to control of intragastric pH or clearance of H. pylori.
  
  
  CONCLUSIONS
  Omeprazole, 20 mg once daily, and lansoprazole, 30 mg once daily, are comparably effective antisecretory agents in H. pylori-positive subjects. Both agents provide only transient clearance of H. pylori in a few subjects.
authors.affiliation: Division de Gastroenterology, CHUV, Lausanne, Switzerland.
authors.forename: E F
authors.initials: EF
authors.lastname: Verdú
authors.forename: R
authors.initials: R
authors.lastname: Fraser
authors.forename: D
authors.initials: D
authors.lastname: Armstrong
authors.forename: A L
authors.initials: AL
authors.lastname: Blum
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000328:Adult; D000897:Anti-Ulcer Agents / Q000008:administration & dosage / Q000494:pharmacology*; D016001:Confidence Intervals; D018592:Cross-Over Studies; D004311:Double-Blind Method; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D064747:Lansoprazole; D008297:Male; D009853:Omeprazole / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology*; D012698:Serologic Tests; D013270:Stomach / Q000737:chemistry / Q000187:drug effects* / Q000382:microbiology
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000897:Anti-Ulcer Agents; D064747:Lansoprazole; D009853:Omeprazole