High levels of thyroid-stimulating hormone are associated with aortic wall thickness in the general population.

Abstract

Our aim was to investigate the association of thyroid function defined by serum concentrations of thyroid-stimulating hormone (TSH) with thoracic aortic wall thickness (AWT) as a marker of atherosclerotic processes. We pooled data of 2,679 individuals from two independent population-based surveys of the Study of Health in Pomerania. Aortic diameter and AWT measurements were performed on a 1.5-T MRI scanner at the concentration of the right pulmonary artery displaying the ascending and the descending aorta. TSH, treated as continuous variable, was significantly associated with descending AWT (β = 0.11; 95% confidence interval (CI) 0.02-0.21), while the association with ascending AWT was not statistically significant (β = 0.20; 95% CI -0.01-0.21). High TSH (>3.29mIU/L) was significantly associated with ascending (β = 0.12; 95% CI 0.02-0.23) but not with descending AWT (β = 0.06; 95% CI -0.04-0.16). There was no consistent association between TSH and aortic diameters. Our study demonstrated that AWT values increase with increasing serum TSH concentrations. Thus, a hypothyroid state may be indicative for aortic atherosclerosis. These results fit very well to the findings of previous studies pointing towards increased atherosclerotic risk in the hypothyroid state. • Serum TSH concentrations are positively associated with aortic wall thickness. • Serum TSH concentrations are not associated with the aortic diameters. • Serum 3,5-diiodothyronine concentrations may be positively associated with aortic wall thickness.