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The article presents research findings of reduced thyroid function impact on the background of insulin resistance on the specific links of metabolism, structure and function of the heart. It is found that in thyroid dysfunction, the main nosological form of myocardial lesion in female patients without concomitant cardiovascular disease is the development of metabolic endocrine cardiomyopathy. Feature of cardiac lesion is the absence of cardiosclerotic, myocardial and ischemic processes in hypothyroidism. Obscure clinical symptoms of the heart both in apparent and subclinical hypothyroidism are detected. Features of clinical, instrumental and laboratory changes in female patients with impaired thyroid function are a trend to systolic blood pressure increase, the absence of significant dyslipidemia, dysglycemia, and cardiocytolysis and hepatocytolysis. Thyroid hormone deficiency is associated with increased myocardial repolarization heterogeneity: subclinical hypothyroidism is accompanied by violation of repolarization processes and the development of electrical heterogeneity of ventricular myocardium, and in the apparent hypothyroidism changes are more linked with the violation of the homogeneity of the electrical impulse to the atria.
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