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Subclinical hypothyroidism and Down's syndrome; studies on myocardial structure and function
E Toscano1, G Pacileo, G Limongelli
1Department of Paediatrics, Federico II University of Naples, Italy.
Archives of Disease in Childhood
|November 13, 2003
Summary
Subclinical hypothyroidism (SH) does not appear to affect heart function in children with Down
Area of Science:
- Pediatric Cardiology
- Endocrinology
- Genetics
Background:
- Subclinical hypothyroidism (SH) management is debated due to unclear benefits of L-thyroxine therapy.
- SH may affect myocardial function, a concern in children with Down's syndrome (DS) who often have congenital heart disease.
- Investigating SH's impact on cardiac function in DS is crucial for clinical management.
Purpose of the Study:
- To determine if SH influences myocardial structure and function in children with Down's syndrome (DS).
- To assess cardiac health in DS patients with untreated SH.
Main Methods:
- Echocardiographic analysis of left ventricular mechanics and tissue characterization.
- Study included 16 children with DS and untreated SH and 25 matched euthyroid controls with DS.
Main Results:
- No myocardial impairment was detected in any of the 16 children with DS and SH.
- Cardiac structure and function were not negatively impacted by SH in this cohort.
Conclusions:
- Children with Down's syndrome and subclinical hypothyroidism are not at increased risk for cardiac disease.
- These findings suggest that prolonged L-thyroxine therapy for SH in DS may not be necessary, given the unclear benefit-risk ratio.