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ORIGINAL ARTICLE
Year : 2013  |  Volume : 17  |  Issue : 2  |  Page : 271-275

Noninvasive indicators of atherosclerosis in subclinical hypothyroidism


1 Department of Cardiology, Pamukkale University School of Medicine, Denizli, Turkey
2 Department of Endocrinology, Pamukkale University School of Medicine, Denizli, Turkey

Correspondence Address:
Ismail Dogu Kilic
Pamukkale Universitesi Tip Fakültesi, Kardiyoloji AD, Kinikli, Denizli
Turkey
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2230-8210.109708

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Introduction: Cardiovascular system is rich in thyroid hormone receptors and is one of the major sites of action for thyroid hormones. However, the effect of subclinical hypothyroidism (SCH) on atherosclerosis has not been cleared yet. Materials and Methods: SCH is defined as high thyroid-stimulating hormone (TSH) levels in the presence of normal serum T4 and T3 levels. A total of 32 patients with SCH and 29 controls were included in the study. Carotid intima-media thickness, flow-mediated dilatation, and aortic distensibility were compared between the groups. Results: FMD was lower in patients with SCH than in controls. GTN-induced vasodilatation was similar in the patients with SCH and controls. There was no statistically significant difference between the patients with SCH and controls with respect to CIMT and aortic distensibility. Conclusion: SCH is associated with endothelial dysfunction as established by FMD. Inconsistent results of CIMT and aortic stiffness can be explained by these parameters being measures of structural changes whereas FMD is a dynamic measure that reflects the impact of both acute and chronic influences on endothelial function.


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