Lipid peroxidation and antioxidant activity in the margin and periulcerous zones of duodenal mucosa were investigated in 111 patients with duodenal ulcer before treatment and in periscar zone after chemotherapy allowing for Helicobacter pylori infection. In active ulcer lipid peroxidation was high while antioxidant activity was depressed. Helicobacter pylori was found able to initiate peroxidation. Pathogenetic therapy including antihelicobacter drugs inhibits activity of lipid peroxidation and promotes normalization of antioxidant activity of duodenal mucosa. This gives grounds for combined use of antisecretory and antichelicobacter medicines.
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