title: Isolated H. pylori duodenal colonization and idiopathic duodenal ulcers.
abstract: OBJECTIVE
  To evaluate whether some duodenal ulcers (DU) classified as idiopathic according to standard criteria may be causally related to isolated duodenal colonization by H. pylori.
  
  
  METHODS
  We studied consecutive ambulatory patients undergoing upper gastrointestinal endoscopy in a secondary care setting. Gastric and duodenal biopsies for diagnosing H. pylori infection were taken from all patients. Independently from the findings of duodenal biopsies, DU patients without gastric infection were classified as having idiopathic ulcers, and underwent urea C13 breath test and subsequent eradication therapy. Endoscopy was repeated 6 months after eradication treatment.
  
  
  RESULTS
  Among 608 DU patients, 42 (6.9%) were classified as idiopathic: 24 (3.9%) were free from gastric and duodenal infection (group A) and 18 (3.0%) (group B) had isolated duodenal colonization. Urea C13 breath test was positive in one (4.2%) group A patient and in 3 (16.7%) group B patients. After eradication therapy, DU were detected in 14 out of 20 group A patients (70%) (four patients did not perform control endoscopy) and in 2 group B patients (11.1%): OR 18.66, 95% CI 3.23-107.82, P= 0.002. The difference was still detectable after multivariate analysis taking into account possible confounding factors: OR 15.79, 95% CI 2.48-100.53, P= 0.001.
  
  
  CONCLUSIONS
  Isolated duodenal colonization by H. pylori is detectable in a substantial proportion of patients with so-called idiopathic DU, and eradication therapy is effective in these patients.
authors.affiliation: Department of Biopathology-Occupational Medicine, Tor Vergata University, Rome, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Pietroiusti
authors.forename: Antonio
authors.initials: A
authors.lastname: Forlini
authors.forename: Andrea
authors.initials: A
authors.lastname: Magrini
authors.forename: Alberto
authors.initials: A
authors.lastname: Galante
authors.forename: Antonio
authors.initials: A
authors.lastname: Bergamaschi
mesh_terms: D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D000897:Anti-Ulcer Agents / Q000627:therapeutic use; D001706:Biopsy; D001944:Breath Tests; D015169:Colony Count, Microbial; D004381:Duodenal Ulcer / Q000150:complications / Q000188:drug therapy / Q000382:microbiology*; D005260:Female; D005500:Follow-Up Studies; D016481:Helicobacter Infections / Q000150:complications / Q000188:drug therapy / Q000382:microbiology*; D016480:Helicobacter pylori / Q000254:growth & development* / Q000302:isolation & purification; D006801:Humans; D007413:Intestinal Mucosa / Q000382:microbiology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D054328:Proton Pump Inhibitors / Q000627:therapeutic use; D012189:Retrospective Studies; D014508:Urea / Q000032:analysis
chemical_list: D000900:Anti-Bacterial Agents; D000897:Anti-Ulcer Agents; D054328:Proton Pump Inhibitors; D014508:Urea