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Published on: May 6, 2013
[Normal course of autoimmune thyroid disease in diabetic children]
V Rákosníková1, M Zahradníková, J Zikmund
1Klinika dĕtí a dorostu 3. LF UK a FNKV, Praha.
Insights
Autoimmune thyroid disease (AITD) affects 28% of children with Type 1 diabetes mellitus (T1DM). Severely elevated autoantibodies increase the risk of subclinical hypothyroidism, while mild elevations do not predict thyroid dysfunction.
Area of Science:
- Pediatric Endocrinology
- Immunology
- Endocrinology
Context:
- Type 1 diabetes mellitus (T1DM) is frequently associated with other autoimmune conditions.
- Autoimmune thyroid disease (AITD) is the most common comorbidity in children with T1DM.
Purpose:
- To determine the prevalence of AITD in children with T1DM.
- To investigate the natural course of AITD in this pediatric cohort.
Summary:
- AITD was diagnosed in 31% of 110 children with T1DM.
- Mild elevations in thyroid autoantibodies (thyroglobulin autoantibodies [Ab-hTG] and/or peroxidase autoantibodies [Ab-TPO]) were not linked to thyroid morphology changes or dysfunction.
- Severe elevations in Ab-hTG and/or Ab-TPO were associated with an increased risk of subclinical hypothyroidism and morphological changes in the thyroid gland.
Impact:
- Identifies children with T1DM at higher risk for developing hypothyroidism.
- Informs clinical monitoring and management strategies for pediatric patients with T1DM and AITD.
- Highlights the importance of monitoring thyroid function in children with T1DM, particularly those with elevated autoantibody levels.
Background:
Autoimmune thyroid disease (AITD) represents the most frequent associated manifestation of the autoimmune disease in children with Type 1 diabetes mellitus (T1DM). The aim of the study was to evaluate the prevalence and natural course of AITD in unselected cohort of diabetic children.
Methods And Results:
TSH, free thyroxin, thyreoglobulin autoantibodies (Ab-hTG), peroxidase autoantibodies (Ab-TPO) and thyroid sonography were prospectively evaluated (1 to 6 years; 323 patient-years) in 110 patients with T1DM (age 2.1-20.8 years; 60 boys). Mild elevation of Ab-hTG and/or Ab-TPO levels (> 100, < 1000 mIU/l) was found in 19 patients (17%; boys:girls 1:2.2). Out of these, only 2 had increased thyroid volume and/or abnormal echotexture. In 9 of these patients, levels of autoantibodies subsequently declined below 100 mIU/l, remained unchanged in 9 patients and only in one case increased over 1000 mIU/l ("benign form" of AITD). All patients remained euthyroid. Severe elevation of Ab-hTG and/or Ab-TPO (> 1000 mIU/l) was found in 12 patients (11%; boys:girls 1:1). Out of these, eight had increased thyroid volume and ten had abnormal echotexture. Subclinical hypothyroidism developed within the observation period in nine of them (boys:girls 2:1).
Conclusions:
AITD was found in 31 (28%) children and adolescents with T1DM. Whereas mild elevation of Ab-hTG and/or Ab-TPO levels was not accompanied with morphological changes of the thyroid and did not predict functional disorder, severely elevated levels were associated with the early risk of subclinical hypothyroidism.
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