Two once-weekly intravenous injections of the polyethylene oxide Polyox WSR-301 (yielding a blood concentration of the order of 5• .6 g/ml) led to a 38% decrease in the area occupied by sudanophilic lesions in the aortic arch of rats fed an atherogenic diet for two weeks. Perfusion under constant pressure of the formalin-fLxed vascular system in the posterior part of the body with physiological saline and then with polyethylene oxide (10 -s g/ml) was without effect in normal rats and in those with mild lipoidosis, but reduced hydrodynamic vascular resistance by 9-14.5% in rats with pronounced lipoidosis. Intravenous injection of polyethylene oxide into anesthetized rats with pronounced lipoidosis in doses that were subthreshold for normal rats (blood concentrations of the polymer were of the order of 10 -7 g/ml) caused a 20% decrease in the total peripheral resistance to blood flow, with a 17-20% rise of the blood flow rate in the carotid artery.

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The article presents research data of oxidative stress role in the pathogenesis of anemia in patients with CKD V stage, who receive hemodialysis replacement therapy. Background. Oxidative stress is a part of the pathogenesis of many complications in patients with CKD stage V on replacement therapy with hemodialysis. Anemia syndrome is the most frequent complication of this patient`s population. Aim. The aim of this study was to study indicators of oxidative stress in patients with            CKD stage V and anemia on replacement therapy with hemodialysis. Materials and methods. We studied laboratory parameters in 42 hemodialysis patients with CKD V stage. Biochemical methods are used for investigation of lipid peroxidation processes: studied diene conjugates (DC), malondialdehyde (MDA), total lipids and catalase, lipid’s structure of erythrocytes membranes and their osmotic resistance. Results. We found that in dialysis patients anemic syndrome was associated with high activity of oxidative stress. Also increased destruction of red blood cells depends from high activity of oxidative stress. In the blood of the patients concentration of DC was 1,12±0,26 opt.den.units/ mg of lipids (p<0,01), and MDA level 0,35±0,05 opt.den.units/ mg of lipids (p<0,01). Levels of catalase, decreased to 0,029±0,0019 mm/l*sec (p<0,001). Also osmotic resistance of erythrocytes significantly decreased. MDA has inverse correlation relationship with hemoglobin in the blood, with a correlation coefficient r=-0,36. Investigation of erythrocyte membrane lipid structure of patients by TLC showed a significant decrease of phospholipids and monoglycerides of higher fatty acids, and the increase of cholesterol fractions. Conclusions. In patients with chronic kidney disease on dialysis replacement therapy anemic syndrome is associated with high activity of oxidative stress, as there is an inverse relationship between the level of hemoglobin and the content of MDA in blood. As a consequence of oxidative stress changes the lipid composition of erythrocyte membranes of the patient, because some fraction of lipids are substrates for oxidative processes. Impairment of lipid membranes of red blood cells of hemodialysis patients is one of the probably causes of anemia.