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Graves’ disease (GD) is an autoimmune thyroid disorder. It accounts for 70-80 % of all cases of hyperthyroidism. The aim of this study is to examine the change of oxidative stress and antioxidant enzyme activities in 23 Graves’ disease patients before treatment with methimazole and in 31 healthy controls. The levels of malondialdehyde (MDA) in the plasma, superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX) activities in erythrocytes were measured. Serum levels of TSH and free thyroxin (fT4) were also estimated. We observed increased concentrations of fT4 and suppressed TSH levels before treatment. Significantly higher MDA concentrations were found in hyperthyroid GD patients compared to controls (1.96±0.10 µmol/l vs. 1.71±0.05 µmol/l, p |
