Role of Biopsy from Gastric Corpus in Diagnosis of Helicobacter pylori Infection in Patients on Acid Suppression Therapy

There are reports of migration of Helicobacter pylori from the gastric antrum to the proximal stomach following acid suppression therapy. The diagnosis of H pylori infection is usually based on rapid urease test and histology of gastric antral biopsies. 50 consecutive patients of peptic ulcer, 22 on proton pump inhibitors and 28 on histamine-2 receptor antagonists for at least 4 weeks were subjected to biopsies from the gastric corpus in addition to the antrum at the time of upper gastrointestinal endoscopy. H pylori infection was detected in 42 (84%) patients. The diagnosis was established from both antral and corpus biopsies in 34 (68%) and only antrum in 4 (8%). In 4 patients, 3 on proton pump inhibitors and one on H-2 receptor antagonists, H pylori was isolated only from the corpus. The rapid urease test was positive at a mean time of 67.6 minutes from the antrum as compared to 234.6 minutes from the corpus. Testing for H pylori from the antrum alone and not the corpus would have resulted in a false negative result in 8% patients. Biopsy from the gastric antrum should always be combined with biopsy from gastric corpus for the diagnosis of H pylori infection in patients with dyspepsia on acid suppression therapy.Key Words: Helicobacter pylori, Rapid urease test