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It is known that patients with chronic kidney disease (CKD) often have hypothyroidism. In patients with CKD, iodine excretion in the urine is disrupted. The high content of iodine in the thyroid gland and tissues leads to a disruption in the synthesis and peripheral metabolism of thyroid hormones. In hypothyroidism, there is a disruption of sodium and water reabsorption in the proximal tubule, the volume of the filtrate increases, the volume of the tubular apparatus overloads, and the eGFR decreases.THЕAIM:to study the occurrence of hypothyroidism in patients with different stages of CKD, to evaluate the parameters of thyroid status and antithyroid antibodies in patients with CKD.PATIENTS AND METHODS.953 patients from I.P. Pavlov SPbSMU clinics (screening group) were examined. TSH, free T4, serum creatinine were defined and eGFR was calculated using the formula CKD-EPI in all patients. A group of patients with hypothyroidism accounted for 466 patients. Patients with a normal TSH of 0.4-2.5 mIU / L (comparison group) were selected from the screening group.RESULTS.eGFR in the screening group and in the group of hypothyroid patients correlated with age. Hypothyroidism was associated with female sex and older age. In the group of patients with advanced stage CKD (3B-5), the incidence of subclinical and manifest hypothyroidism was 3 times higher than in the group with normal GFR (GFR> 90 ml / min, p = 0.007). In the group of patients with hypothyroidism, the frequency of advanced stages of CKD (3B-5) was 2 times higher than in the comparison group (p = 0.02). In patients with CKD, a direct correlation was found between GFR and free T3 (r = 0.34, p = 0.02). Thyroid peroxidase antibodies were revealed in 64% of patients with CKD with hypothyroidism.CONCLUSION.Hypothyroidism is associated with chronic kidney disease. For patients with CKD, there is a syndrome of euthyroid pathology ("low T3" syndrome). Hypothyroidism in patients with CKD is not always the outcome of autoimmune thyroiditis.

Disturbance of the thyroid function is often detected in patients with different profiles. A special feature of patients with chronic kidney  disease is the higher incidence of various thyroid function  disturbances, especially hypothyroidism. It is known that in patients  with chronic kidney disease (CKD) iodine excretion from the body is  violated, since normally 90% of iodine is excreted in urine.  Accumulation of high concentrations of inorganic iodine leads to the  formation of the Wolf-Chaikoff effect: suppression of iodine  organization in the thyroid gland and disruption of the thyroid  hormones synthesis. Peripheral metabolism of thyroid hormones is  also disturbed, namely, deiodinase type I activity is suppressed and  peripheral conversion of T4 into T3 is inhibited (so-called low T3  syndrome). Therefore, patients with CKD are often diagnosed with  hypothyroidism, and the origin of hypothyroidism is not always  associated with the outcome of autoimmune thyroiditis. The article  presents an overview of a large number of population studies of  thyroid gland dysfunction in patients with CKD, as well as  experimental data specifying the pathogenetic mechanisms of  thyroid dysfunction in patients with CKD. Therapeutic tactics are still  not regulated. However, in a number of studies, replacement therapy with thyroid hormones in patients with CKD had some advantages.

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