Common occurrence of atrophic gastritis in an ageing non-hospitalised population: an autopsy study

Background: Atrophic gastritis - the end stage of chronic gastritis - is an asymptomatic disease due to Helicobacter pylori infection causing decreased vitamin B12 and folate absorption, which may lead to severe haematological and neuropsychological disorders including Alzheimer's disease. The diagnosis requires endoscopy and biopsies from symptomatic patients, explaining why its true prevalence in the population is not well-known. Objective: We aimed to evaluate the prevalence of various stages of chronic gastritis in an autopsy series most closely representing the general population. Subjects and Methods: Gastric mucosa samples were collected prospectively from out-of-hospital deaths included in the Tampere Sudden Death Study (n = 70, mean age 63, age range 22-91 years). Antrum and corpus samples were stained with a H. pylori antibody and staged histopathologically. Results: Chronic gastritis with or without atrophic changes was detected in 40% of the cases. The proportion of healthy mucosa decreased age-dependently from 71.4% among individuals aged <50 years to 43.5% among the oldest individuals (>70 years), and that of chronic non-atrophic gastritis from 21.4% to 8.7%. In contrast, the prevalence of atrophic gastritis was 27.1% and increased in the age groups from 7.1% to 47.8% (P =. 019) among the oldest individuals, showing a strong association (P <. 0001) with H. pylori immunopositivity. Conclusions: Atrophic gastritis is a common feature of the ageing stomach, which is observed in every second individual aged 70+ years, showing a strong association with H. pylori immunopositivity. Atrophic gastritis may be a more common risk factor in old age for diseases associated with low serum B12 and folate levels than has been previously known.