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Related Concept Videos

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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Updated: Nov 4, 2025

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis
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Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis

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Thyroid and heart, a clinically relevant relationship.

G Corona1, L Croce2,3,4, C Sparano5

  • 1Endocrinology Unit, Medical Department, Maggiore-Bellaria Hospital, Azienda-Usl Bologna, Bologna, Italy.

Journal of Endocrinological Investigation
|May 25, 2021
PubMed
Summary
This summary is machine-generated.

Thyroid disorders impact cardiovascular health, with established links for overt conditions and ongoing debate for subclinical thyroid dysfunction. This review synthesizes meta-analyses on thyroid disease and heart risks.

Keywords:
Cardiovascular riskCoronary artery diseasesHyperthyroidismHypothyroidismThyroid

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Area of Science:

  • Endocrinology
  • Cardiology
  • Internal Medicine

Background:

  • Thyroid disorders are common, affecting many individuals globally.
  • Overt thyroid dysfunction clearly links to cardiovascular complications.
  • Subclinical thyroid dysfunction's cardiovascular impact remains debated.

Purpose of the Study:

  • To review recent meta-analyses on thyroid dysfunction and cardiovascular disease.
  • To explore the complex relationship between thyroid imbalances and heart health.
  • To summarize evidence on cardiovascular risks associated with thyroid disorders.

Main Methods:

  • Systematic review of meta-analyses.
  • Analysis of cardiovascular risk in overt and subclinical thyroid dysfunction.
  • Stratification of data by age, TSH levels, and pre-existing cardiovascular disease.

Main Results:

  • Physiopathological links between thyroid hormones and the cardiovascular system.
  • Evidence from meta-analyses on cardiovascular risk in overt thyroid dysfunction.
  • Evidence from meta-analyses on cardiovascular risk in subclinical thyroid dysfunction, stratified by key patient factors.

Conclusions:

  • Thyroid hormone imbalances have significant cardiovascular implications.
  • Cardiovascular risk varies with overt and subclinical thyroid dysfunction, influenced by patient factors.
  • Therapy for subclinical thyroid disease may improve cardiovascular outcomes.