The objective of the present study was to determine the amount of products of lipid peroxidation (dienic conjugates and malonic dialdehydes) together with antioxidative enzymes (catalase and superoxide dismutase) in 47 children presenting with acute pyo-inflammatory otitis media (APIOM) and 125 patients with chronic suppurative mesotympanitis (CSMT). In addition, 49 children presenting with chronic suppurative epitympanitis (CSET) and chronic suppurative epimesotympanitis (CSEMT) were included in the study. The data obtained were analysed and compared with the similar characteristics of 28 healthy children of the same age comprising the control group. The age of the children in different groups varied between 2 and 14 years. The study revealed the increase in the amount of lipid peroxidation products in all the groups with the simultaneous reduction of the activity of antioxidative enzymes; moreover, these values changed depending on the form and clinical course of the disease.
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