title: A critique of therapeutic trials in Helicobacter pylori-positive functional dyspepsia.
abstract: OBJECTIVE
  Approximately 50% of patients with functional dyspepsia have Helicobacter pylori infection; it remains controversial whether this infection causes chronic symptoms, but rigorously conducted therapeutic trials should establish whether H. pylori plays a role in functional dyspepsia. The aim here was to determine whether the trials published over the past 10 years were methodologically adequate to establish a role for this infection in functional dyspepsia.
  
  
  METHODS
  A broad-based Medline search to identify all treatment trials published between 1984 and 1993 was performed. All functional dyspepsia trials were systematically analyzed for potential design strengths and weaknesses.
  
  
  RESULTS
  Sixteen trials were included; 8 reported that anti-H. pylori therapy was efficacious and 8 failed to detect a statistically significant benefit. However, in all studies one or more serious methodological weakness was identified, including nonrandomized, non-placebo-controlled designs, lack of maintenance of blindness, application of inadequate outcome measures, failure to eradicate infection and follow up patients after therapy, and inadequate study power.
  
  
  CONCLUSIONS
  There is a pressing need for well-designed trials in H. pylori-positive dyspepsia, and practical suggestions are provided based on a review of the published literature.
authors.affiliation: Department of Medicine, University of Sydney, Nepean Hospital, Australia.
authors.forename: N J
authors.initials: NJ
authors.lastname: Talley
mesh_terms: D000900:Anti-Bacterial Agents / Q000592:standards / Q000627:therapeutic use; D001729:Bismuth / Q000592:standards / Q000627:therapeutic use; D002986:Clinical Trials as Topic / Q000379:methods; D004415:Dyspepsia / Q000188:drug therapy* / Q000382:microbiology / Q000503:physiopathology; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori; D006801:Humans; D010349:Patient Compliance; D011897:Random Allocation
chemical_list: D000900:Anti-Bacterial Agents; D001729:Bismuth