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The Association Between Blood Pressure and Normal Range Thyroid Function Tests in a Population Based Tehran Thyroid

A Amouzegar1, M Heidari1,2, S Gharibzadeh1,3

  • 1Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, I. R. Iran.

Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|December 17, 2015
PubMed
Summary
This summary is machine-generated.

Thyroid hormones influence blood pressure. In euthyroid individuals, thyroid-stimulating hormone (TSH) showed no link to blood pressure, but free thyroxine (FT4) levels positively correlated with blood pressure metrics.

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Area of Science:

  • Endocrinology
  • Cardiovascular Medicine
  • Internal Medicine

Background:

  • Overt hypothyroidism is linked to diastolic hypertension.
  • The relationship between subclinical hypothyroidism and hypertension remains debated.
  • Understanding thyroid hormone effects on blood pressure in euthyroid individuals is crucial.

Purpose of the Study:

  • To investigate the association between serum thyroid hormones and blood pressure parameters in euthyroid subjects.
  • To analyze systolic blood pressure, diastolic blood pressure, pulse pressure, and mean arterial pressure in relation to thyroid hormone levels.

Main Methods:

  • Analysis of data from 4,756 euthyroid participants in the Tehran Thyroid Study (TTS).
  • Participants were categorized into TSH tertiles.
  • Measurements included serum TSH, free T4 (FT4), blood pressure, and BMI.

Main Results:

  • No association was found between TSH levels within the reference range and blood pressure profiles.
  • A negative association between pulse pressure and TSH was observed in the second tertile (r=-0.066, p=0.009).
  • Serum FT4 levels demonstrated a significant positive association with systolic blood pressure, diastolic blood pressure, pulse pressure, and mean arterial pressure.

Conclusions:

  • Serum TSH levels within the normal range are not associated with blood pressure in euthyroid individuals.
  • Serum FT4 levels are positively associated with various blood pressure parameters in euthyroid subjects.
  • These findings contribute to understanding the role of thyroid hormones in cardiovascular health.