“…Thyroid gland is an endocrine gland, which function influences the work of the whole body, because thyroid hormones support the work of the brain, heart, muscles and bones, the reproductive system and play an important role in the metabolism [1,2]. At the same time, thyroid hormones help to increase the volume of circulating blood and raise the use of oxygen by myocardium, and if its utilization from the blood does not increase herewith, it can lead to a violation of metabolic and enzymatic processes in the myocardium [3,4].…”