Kosharnyi V. V., Nefodova O. O., Abdul-Ogly L. V., Rutgaizer V. G., Kramar S. B., Kuznetsova O. V., Velikorodny V. I.

MORPHOLOGY

Scentific article

Unsolved questions regarding the impact of electromagnetic radiation on the myocardium in conditions of a hypothyroid state require an in-depth study of this current and important modern problem. The purpose of the study is to establish macro- and microscopic changes in the myocardium of the heart of experimental animals under the conditions of modeling hypothyroidism under the influence of microwave electromagnetic radiation. The object of the study were the hearts of 126 laboratory sexually mature rats weighing 180-200 g, aged 4-6 months, divided into control and five experimental groups. This section of the experiment concerned the observation of the following experimental groups of rats: control; after thyroidectomy; after thyroidectomy and after exposure to microwave radiation for 45 minutes; after thyroidectomy and after exposure to microwave radiation for 120 min. Experimental animals were irradiated with microwave electromagnetic radiation with a frequency of 10 GHz, with a wavelength of 3 cm at different exposure times – 45 and 120 minutes – daily for 10 days. Studying the hearts of rats, we determined changes at the macro level in weight indicators of rat hearts. Analysis of changes at the level of the organ, i.e. the heart, showed that the greatest changes in heart weight were observed in the state of experimentally obtained hypothyroidism and the influence of ultra-high-frequency electromagnetic radiation with an exposure period of 120 minutes. Such an increase in the weight of the heart in the group of rats of this group was assessed by us as a destructive effect, which is associated with a more pronounced defibration of muscle fibers in the myocardium of the heart wall of the ventricles of rats, and, as a result, swelling of the interstitial spaces and disruption of blood supply at the microcirculatory level. During the morphological study under the conditions of modeling hypothyroidism after thyroidectomy at the microscopic level, destructive changes and degeneration processes of muscle fibers were observed in the myocardium. After thyroidectomy and exposure of microwave electromagnetic radiation for 45 minutes, we observed compensatory remodeling of unchanged structural components of the myocardium of the heart wall and hypertrophy of cardiomyocytes, which is evidence of the adaptive, reparative-regenerative effect of microwave electromagnetic radiation on the myocardium for 45 minutes. In a group of rats after thyroidectomy and exposure to microwave radiation with exposure for 120 minutes, an increase in degenerative-destructive processes in the myocardium with swelling of interstitial spaces was observed, which indicates the suppressive and destructive effect of microwave electromagnetic radiation of this term on cardiomyocytes.

heart,myocardium,thyroidectomy,hypothyroid state,microwave electromagnetic radiation.

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«Bulletin of problems biology and medicine» Issue 3 (166), 2022 year, 389-393 pages, index UDK 616.12–008.1:576.31:528.811:616.441–002–089.87:611–092.9

10.29254/2077-4214-2022-3-166-389-393