title: Helicobacter pylori eradication releases prolonged increased acid secretion following omeprazole treatment.
abstract: OBJECTIVE
  Rebound increased acid secretion has been observed at 2 weeks after discontinuing omeprazole treatment in Helicobacter pylori -negative, but not H. pylori -positive, subjects. It is unknown whether this is a prolonged phenomenon or whether a similar phenomenon appears later in H. pylori positives or is released by eradication therapy. The aims of this study were to answer these 3 questions.
  
  
  METHODS
  Twelve H. pylori -negative and 20 H. pylori -positive subjects were studied. Each had a basal, submaximal, and maximal pentagastrin-stimulated acid secretion study before, during, and at 7, 14, 28, 42, and 56 days after a 56-day course of omeprazole 40 mg/day. Ten of the H. pylori -positive subjects had their infection eradicated during the last week of treatment.
  
  
  RESULTS
  In the H. pylori -negative subjects, there was rebound secretion of submaximal (P < 0.003) and maximal (P < 0.003) acid output, which persisted until at least 56 days after discontinuing omeprazole. The H. pylori -uneradicated subjects had no rebound increased secretion other than in maximal acid output at 28 (P < 0.01) and at 42 days after treatment (P < 0.02). In those eradicated of H. pylori close to the end of omeprazole, there was rebound increased secretion of submaximal acid output (P < 0.04) lasting until 56 days and of maximal acid output (P < 0.01) lasting until 28 days after treatment.
  
  
  CONCLUSIONS
  Rebound increased acid secretion following omeprazole is a prolonged phenomenon in H. pylori -negative subjects. There is little evidence of it in H. pylori -infected subjects, but eradicating the infection releases the phenomenon. The accentuated H. pylori -related oxyntic gastritis induced by omeprazole is likely to protect against the rebound phenomenon.
authors.affiliation: GI Unit, Aberdeen Royal Infirmary, Scotland.
authors.forename: Derek
authors.initials: D
authors.lastname: Gillen
authors.forename: Angela A
authors.initials: AA
authors.lastname: Wirz
authors.forename: Kenneth E L
authors.initials: KE
authors.lastname: McColl
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000008:administration & dosage; D000897:Anti-Ulcer Agents / Q000008:administration & dosage*; D005215:Fasting; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D005753:Gastric Mucosa / Q000187:drug effects / Q000378:metabolism; D005755:Gastrins / Q000097:blood; D005756:Gastritis / Q000188:drug therapy / Q000378:metabolism; D016481:Helicobacter Infections / Q000188:drug therapy* / Q000378:metabolism*; D016480:Helicobacter pylori; D006801:Humans; D008297:Male; D009853:Omeprazole / Q000008:administration & dosage*
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D005755:Gastrins; D009853:Omeprazole