Low serum free thyroxine concentrations associate with increased arterial stiffness in euthyroid subjects: a population-based cross-sectional study.

Abstract

Some studies suggest that even in euthyroid subjects, thyroid function may affect arteriosclerotic risk factors. We aimed to determine whether thyroid hormones or thyroid autoantibodies are associated with arterial stiffness in middle-aged and elderly Chinese subjects with euthyroidism. A cross-sectional, population-based study was conducted in Nanjing, China. A total of 812 euthyroid subjects (mean age [56.75 ± 8.34] years; 402 men) without vascular disease and major arteriosclerotic risk factors were included. Clinical factors, oral glucose tolerance test results, homeostasis model assessment for insulin resistance (HOMA-IR) results, and serum levels of lipids, free triiodothyronine (FT3), free thyroxine (FT4), thyroid-stimulating hormone (TSH), and thyroid autoantibodies were measured. Arterial stiffness was assessed using brachial-ankle pulse wave velocity (baPWV). In Pearson correlation analyses, baPWV correlated inversely with FT4 (r = -0.146, P < 0.001), but not with FT3 (r = 0.008, P = 0.816) or TSH (r = 0.055, P = 0.118). Subsequently, a multiple stepwise regression analysis revealed a significant and independent association of FT4 with baPWV in euthyroid subjects (β = -0.076, P = 0.005). After adjusting for potential cardiovascular risk factors, mean diastolic blood pressure (DBP), HOMA-IR, and baPWV levels decreased across increasing FT4 quartiles (DBP, P < 0.001; HOMA-IR, P < 0.001; baPWV, P = 0.003). No difference in baPWV was observed between the positive and the negative thyroid antibody groups (15.23 ± 3.30 m/s vs. 15.73 ± 3.05 m/s, P > 0.05). FT4 levels were inversely associated with arterial stiffness in euthyroid subjects. A prospective study is warranted to validate whether subjects with low-normal FT4 levels have a high incidence of cardiovascular disease.

• Authors: Jian Wang, Xuqin Zheng, Min Sun, Zhixiao Wang, Qi Fu, Yun Shi, Mengdie Cao, Zhenxin Zhu, Chuchen Meng, Jia Mao, Fan Yang, Xiaoping Huang, Jingjing Xu, Hongwen Zhou, Yu Duan, Wei He, Mei Zhang, Tao Yang, REACTION Study Group
• Journal: Endocrine (Endocrine) Vol. 50 Issue 2 Pg. 465-73 (Nov 2015) ISSN: 1559-0100 [Electronic] United States
• PMID: 25987347 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Autoantibodies
• Autoantigens
• Iron-Binding Proteins
• anti-thyroglobulin
• Triiodothyronine
• Thyrotropin
• TPO protein, human
• Iodide Peroxidase
• Thyroxine

Topics

• Aged
• Ankle Brachial Index
• Autoantibodies (blood)
• Autoantigens (immunology)
• Cardiovascular Diseases (blood)
• China
• Cross-Sectional Studies
• Female
• Humans
• Iodide Peroxidase (immunology)
• Iron-Binding Proteins (immunology)
• Male
• Middle Aged
• Thyrotropin (blood)
• Thyroxine (blood)
• Triiodothyronine (blood)
• Vascular Stiffness (physiology)