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  • Title: L-thyroxine stabilizes autoimmune inflammatory process in euthyroid nongoitrous children with Hashimoto's thyroiditis and type 1 diabetes mellitus.
    Author: Korzeniowska K, Jarosz-Chobot P, Szypowska A, Ramotowska A, Fendler W, Kalina-Faska B, Szadkowska A, Mlynarski W, Mysliwiec M.
    Journal: J Clin Res Pediatr Endocrinol; 2013; 5(4):240-4. PubMed ID: 24379033.
    Abstract:
    OBJECTIVE: To investigate if L-thyroxine (T4) treatment may influence the clinical course of autoimmune thyroiditis (AIT) or prevent progression to subclinical or overt hypothyroidism in euthyroid nongoitrous pediatric patients with type 1 diabetes mellitus (T1DM) and AIT. METHODS: The study was performed in four Polish pediatric diabetes centers. Of 330 children with T1DM and AIT followed between 2008 and 2012, 101 received L-T4 and 160 underwent clinical observation for 24 months. Thyroid stimulating hormone (TSH), free T4 (fT4), anti thyroid peroxidase antibody (anti-TPO), anti thyroglobulin antibody (anti-TG), glycosylated hemoglobin (HbA1c) levels, and lipid profile were assessed in all patients. Ultrasonographic evaluation was also performed in all children at each examination. RESULTS: Patients treated with thyroid hormones had higher TSH levels (3.99; interquantile 3.5 to 4.52 vs. 2.09 mIU/L; interquantile 1.55 to 3.06; pp<0.0001). A fall in TSH level (0.87 mIU/L 95% CI 0.43-1.30; pp<0.0001) was documented after the first year of treatment. FT4 level did not differ between the groups at baseline (p=0.7434), but rose in the treatment group and fell in the control group [mean difference 0.78 95% CI-0.22-1.53 pmol/L (p=0.02) after 12 months and 0.98 95% CI 0.04-1.76 (p=0.005) after 24 months]. Higher levels of anti-TPO were initially found in the treated patients (pp<0.0001) and significantly decreased over the 24-month period (pp<0.0001). Children in the treatment group had higher anti-TG levels (pp<0.0001), which showed a borderline decrease (p=0.08) in time. In the control group, anti-TG levels rose marginally (p=0.06) during the study. CONCLUSIONS: The data demonstrate that treatment with L-T4 in euthyroid pediatric patients with T1DM and AIT stabilizes autoimmune inflammation in the thyroid gland and is to be recommended as soon as the diagnosis is established.
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