Endocrinol Metab > Volume 21(6); 2006 > Article
Journal of Korean Endocrine Society 2006;21(6):490-496.
DOI: https://doi.org/10.3803/jkes.2006.21.6.490    Published online December 1, 2006.
Comparison of Common Carotid Artery Intima-Media Thickness between Subclinical Hypothyroidism and Euthyroidism.
Kyung Sun Park, Jung Im Rue, Soo Kyung Kim, In Jae Kim, Sang Wook Lim, Seok Won Park, Yu Lee Kim, Dong Hoon Cha, Yong Wook Cho, Young Kil Choi, Sang Jong Lee
Department of Internal Medicine, College of Medicine, Pochon CHA University, Korea.
Common carotid artery intima-media thickness (IMT), which is increased in patients with overt hypothyroidism, is an independent risk factor of the atherosclerosis-related disease. This study was performed to compare serum lipid level and common carotid artery IMT among patients with overt hypothyroidism, subclinical hypothyroidism and euthyroidism. METHODS: Patients with newly-diagnosed subclinical (n=32) and overt (n=32) hypothyroidism were selected for this study. All of the patients and an age- and sex-matched euthyroidism cohort were checked for clinical characteristics and serum lipid levels. Common carotid artery IMT was also measured using high resolution B-mode ultrasonography. RESULTS: Statistically significant differences were observed between the total cholesterol levels of patients with subclinical hypothyroidism and those with euthyroidism. When common carotid artery IMT measured by ultrasonography, subclinical (0.67 +/- 0.11 mm) and overt (0.71 +/- 0.12 mm)) hypothyroidism showed significantly increased mean IMT compared to that of euthyroidism (0.58 +/- 0.07 mm, P < 0.05, respectively), but no differences were found between subclinical and overt hypothyroidism. CONCLUSION: We concluded that subclinical hypothyroidism is related to increased common carotid artery IMT as well as dyslipidemia. Therefore, we recommend that treatment principle of subclinical hypothyroidism be established through large-scale, prospective studies performed to determine the effect of thyroid hormone replacement on the reduction of common carotid artery IMT.
Key Words: Atherosclerosis, Intima-media thickness, Subclinical hypothyroidism

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