Abstract
Introduction. Oxidative stress is a pathogenetic link in the development of many diseases, including pathology of the respiratory system and cardiovascular events. Comorbidity is a topical problem of modern medicine. One of the frequent combinations is myocardial infarction against the background of chronic obstructive pulmonary disease. The peculiarities of changes in protein and lipid peroxidation, as well as the state of antioxidant protection in comorbid patients are of interest. Aim. To study protein and lipid peroxidation processes in patients with myocardial infarction against the background of chronic obstructive pulmonary disease. Material and Methods: 195 patients with myocardial infarction against the background of chronic obstructive pulmonary disease were examined. Comparison groups were represented by 130 patients with myocardial infarction without chronic obstructive pulmonary disease and 104 patients with chronic obstructive pulmonary disease. The control group included 110 somatically healthy individuals. The level of malondialdehyde was assessed as a marker of lipid peroxidation, the level of deep protein oxidation products was assessed as a marker of free radical oxidation of proteins. Antioxidant protection was assessed using plasma level of total superoxide dismutase. To evaluate non-enzymatic components of antioxidant protection, total serum antioxidant status was determined by spectroscopy. The data were statistically processed using the SPSS 26.0 software package. Results and discussion. In patients with chronic obstructive pulmonary disease the levels of protein and lipid oxidation markers were higher than in myocardial infarction. The highest levels were noted in comorbid patients. Antioxidant levels were decreased in all groups compared to controls. Patients with monosomatic myocardial infarction had lower levels of antioxidants compared with patients with chronic obstructive pulmonary disease. The lowest values were observed in the group of comorbid patients. Conclusion. Chronic obstructive pulmonary disease is accompanied by a more pronounced activation of lipid and protein peroxidation processes, but accompanied by activation of adaptive mechanisms, which is not observed in acute coronary pathology. The greatest severity of oxidative stress is characteristic of comorbid patients.
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