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Gastric morphology and function in dermatitis herpetiformis and in coeliac disease.

Gastric acid secretory capacity was evaluated in 116 patients with dermatitis herpetiformis by means of the pentagastrin test. Endoscopic gastric mucosal biopsy specimens were obtained from both the body and the antrum in 90 of them. Forty-eight patients (41%) had a maximal acid output less than 10 mmol/h, and 30 of them (26%) were achlorhydric. The frequency of achlorhydria increased with age, and 27 out of 58 patients (47%) more than 50 years old were achlorhydric. Antrum-sparing chronic atrophic gastritis was present in 92% of the achlorhydric patients, and hypergastrinaemia and serum parietal cell antibodies were found in most of them. The prevalence of chronic gastritis of the body and of the antrum increased with age. There was no correlation between atrophic gastritis or achlorhydria and small-intestinal villous atrophy, the results of the D-xylose test, and blood folate and serum zinc determinations. The transferrin saturation index was lower in patients with achlorhydria. The frequency of achlorhydria was significantly higher in patients with dermatitis herpetiformis than in 69 patients with coeliac disease.