Long-term semi-quantitative follow-up of Helicobacter pylori associated gastritis.

Helicobacter pylori infection has been implicated with the development of gastric carcinoma and lymphoma. We studied the long-term effects of H. pylori infection on gastric mucosa. Ten patients with Helicobacter pylori infection underwent repeat endoscopy and antral biopsies 8 years later. Gastric mucosal features (polymorphs, monocytes, intestinal metaplasia, atrophy and lymphoid aggregates) were graded from mild to severe (0 to 3) based on the Sydney system of gastritis classification. At repeat biopsy, 1 patient was negative for H. pylori after eradication therapy. Two patients (20 per cent) had spontaneous disappearance of H. pylori. One of these had intestinal metaplasia which progressed to low grade dysplasia. Polymorphs decreased with eradication of H. pylori (P < 0.05). Lymphoid aggregates increased with continued H. pylori infection but decreased with eradication of H. pylori (P < 0.05). Monocytes, intestinal metaplasia and atrophy remained unchanged. Persistent H. pylori infection appears to increase lymphoid aggregates and may promote its evolution into gastric lymphoma while eradication of H. pylori may result in a reduction of polymorphs and lymphoid aggregates.