The mechanism of adaptation of the organism of patients with chronic heart failure combined with vitamin D deficiency and the morphofunctional state of peripheral blood erythrocytes

  • N. I. Baryla Ivano-Frankivsk National Medical University
  • I. P. Vakaliuk Ivano-Frankivsk National Medical University
  • S. L. Pоpеl’ Precarpathian National University named after V. Stefanik
Keywords: chronic heart failure; vitamin D; erythrocytes; physical activity; morpho-biochemical changes


The problem of structural changes in peripheral blood erythrocytes in patients with chronic heart failure in combination with vitamin D deficiency during exercise stress remains insufficiently studied. Vitamin receptors are located on smooth myocytes, endothelial cells, cardiomyocytes and blood cells. It affects the state of the cell membrane, the contractile function of the myocardium, the regulation of blood pressure, cardiac remodeling and reduction of left ventricular hypertrophy. Therefore, it is important to assess the level of vitamin D in blood plasma in individuals with chronic heart failure and to identify the effect of its deficiency on the state of peripheral red blood cells when performing a 6-minute walk test. A total of 75 patients of the main group with chronic heart failure stage II A, I–II functional class with different levels of vitamin D deficiency were examined. The control group included 25 patients with chronic heart failure stage II A, functional class I–II without signs of vitamin D deficiency. The average age of patients was 57.5 ± 7.5 years. All patients were asked to undergo the 6 minutes walking test. The level of total vitamin D in plasma was determined by enzyme immunoassay. Morphological studies of erythrocytes were performed on the light-optical and electron-microscopic level. The obtained results showed that patients of the main group with chronic heart failure had a decrease in vitamin D by 2.2 times compared with the control group. Correlation analysis showed a directly proportional relationship between vitamin D deficiency and the number of red blood cells of a modified form and red blood cells with low osmotic resistance. Dosed exercise stress in patients with chronic heart failure against a background of vitamin D deficiency leads to an increase in the number of reversibly and irreversibly deformed erythrocytes and a decrease in their osmotic stability. This indicates a disorder in the structural integrity of their membrane and can have negative consequences for the somatic health of such patients.


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How to Cite
Baryla, N. I., Vakaliuk, I. P., & Pоpеl’S. L. (2019). The mechanism of adaptation of the organism of patients with chronic heart failure combined with vitamin D deficiency and the morphofunctional state of peripheral blood erythrocytes . Regulatory Mechanisms in Biosystems, 10(3), 352-357.