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Evaluation of endothelial function in subclinical hypothyroidism and subclinical hyperthyroidism
Ayse S Cikim1, Huseyin Oflaz, Nese Ozbey
1Faculty of Medicine, Department of Internal Medicine, Division of Endocrinology and Metabolism, Inonu University, Malatya, Turkey. acikim@hotmail.com
Thyroid : Official Journal of the American Thyroid Association
|August 24, 2004
Summary
Subclinical hypothyroidism adversely affects endothelial function, indicated by lower flow-mediated dilatation (FMD). This vascular change appears independent of common atherosclerotic risk factors in thyroid patients.
Area of Science:
- Endocrinology
- Vascular Biology
- Cardiovascular Disease
Background:
- Subclinical thyroid dysfunction (hypothyroidism and hyperthyroidism) lacks established therapeutic guidelines.
- These conditions may impact vascular health, specifically endothelial function and carotid artery intima-media thickness (IMT).
Purpose of the Study:
- To compare endothelial function and IMT in subclinical hypothyroidism and hyperthyroidism patients versus euthyroid controls.
- To assess the independent effects of these thyroid states on vascular parameters.
Main Methods:
- Cross-sectional study comparing 25 subclinical hypothyroid, 13 subclinical hyperthyroid, and 23 euthyroid subjects.
- Vascular assessment included flow-mediated dilatation (FMD) and carotid artery intima-media thickness (IMT).
- Groups were matched for established atherosclerotic risk factors.
Main Results:
- Subclinical hypothyroid patients exhibited significantly reduced FMD compared to euthyroid and subclinical hyperthyroid groups.
- No significant differences in carotid artery IMT were found among the three groups.
- Thyroid function status was the sole significant differentiator for FMD.
Conclusions:
- Subclinical hypothyroidism may negatively impact endothelial function independently of other atherosclerotic risk factors.
- Further research is warranted to understand the long-term cardiovascular implications and optimal management of subclinical thyroid dysfunction.