| Summary: | This study aimed to analyze the incidence of malnutrition in patients with chronic kidney disease (CKD) at stage III-IV accompanied by hypothyroidism and indicate the improvement in nutritional status and kidney disease of CKD patients after undergoing thyroid hormone replacement (THR) therapy as therapeutic models. The included 156 CKD patients in stage III-IV were divided into the CKD stage III group (CKD-III group) (n = 80) and CKD stage IV group (CKD-IV group) (n = 76), and the clinical indicators of all the patients were collected. Based on changes in thyroid function, the included patients were again divided into the following groups: subclinical hypothyroidism group (the experimental group, hereinafter referred to Y-group, n = 78) and non-subclinical hypothyroidism group (the control group, hereinafter referred to N-group, n = 78), in which the CKD-III group was divided into CKD-IIIN group (n = 38) and CKD-IIIY group (n = 42), and also the CKD-IV group was divided into CKD-IVN group (n = 40) and CKD-IVY group (n = 36). At the beginning, patients in the Y-group was orally given 25 μg/dL of levothyroxine; based on the progression of the disease, the dosage was regulated; the concentration of serum thyroid stimulating hormone (TSH) was assessed once per month, as well as changes in tri-iodothyronine (T3) and tetraiodothyronine (T4). Estimated glomerular filtration rate (eGFR) in the CKD-IIIY group was significantly changed compared with that of the CKD-IVY group after THR therapy. Comparison of nutrition-based indicators between the N-group and the Y-group showed that the serum albumin (ALB) level, the hemoglobin (HGB) level, and the grip strength of both the left and right hand were notably decreased (P < 0.05). After THR therapy, the indicators related to CKD patients were accompanied by subclinical hypothyroidism changes; the levels of ALB and HGB, as well as the grip strength of both the left and right hand were notably increased compared with before undergoing THR therapy (P < 0.05). In conclusion, malnutrition of chronic kidney disease caused by subclinical hypothyroidism could be partially recovered after THR therapy as therapeutic models. Keywords: Hypothyroidism, Chronic kidney disease, Nutritional status, Thyroid hormone
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