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Related Experiment Video

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Measuring the Carotid to Femoral Pulse Wave Velocity Cf-PWV to Evaluate Arterial Stiffness
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Carotid Beta Stiffness Association with Thyroid Function.

Alessandro P Delitala1,2, Angelo Scuteri1, Edoardo Fiorillo2

  • 1Department of Medical, Surgical, and Experimental Sciences, University of Sassari, 07100 Sassari, Italy.

Journal of Clinical Medicine
|January 27, 2021
PubMed
Summary
This summary is machine-generated.

Higher free thyroxine (FT4) levels increase common carotid artery stiffness, potentially harming elastic arteries. This effect is influenced by heart rate, suggesting a link between thyroid hormones and cardiovascular health.

Keywords:
agingcarotid beta stiffnesscarotid strainheart ratethyroid hormonethyroxine

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Area of Science:

  • Cardiovascular Physiology
  • Endocrinology
  • Vascular Biology

Background:

  • Thyroid hormone levels, particularly free thyroxine (FT4), are implicated in cardiovascular disease.
  • While systemic effects are known, FT4's impact on local arterial elasticity, specifically the common carotid artery, remains under-explored.
  • Arterial stiffness, measured by the β-stiffness index, is a key indicator of vascular health.

Purpose of the Study:

  • To investigate the association between free thyroxine (FT4) levels and local arterial stiffness in the common carotid artery.
  • To determine if FT4 influences other carotid artery parameters like strain and cross-sectional area.
  • To examine the interplay between FT4, heart rate, and carotid artery mechanics.

Main Methods:

  • Cross-sectional analysis of 4846 subjects from the ProgeNIA cohort.
  • Exclusion of individuals with elevated TSH or on thyroid medication.
  • Assessment of carotid artery parameters including β-stiffness index, strain, and cross-sectional area using ultrasound.

Main Results:

  • Free thyroxine (FT4) showed a positive association with the β-stiffness index and a negative association with strain in the common carotid artery.
  • Heart rate was also positively associated with the β-stiffness index.
  • The interaction between FT4 and heart rate significantly influenced the β-stiffness index.

Conclusions:

  • Elevated FT4 levels are linked to increased arterial stiffness in the common carotid artery, suggesting a detrimental effect on elastic arteries.
  • The impact of FT4 on arterial stiffness appears to be mediated, at least in part, by its effect on heart rate.
  • These findings highlight a potential mechanism linking thyroid function to vascular health at the local arterial level.