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Related Concept Videos

Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...

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Related Experiment Videos

Thyroid hormones and the cardiovascular system: pathophysiology and interventions.

G Cini1, A Carpi, J Mechanick

  • 1Department of Internal Medicine, University of Pisa, Pisa, Italy.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|November 18, 2009
PubMed
Summary

Mild thyroid dysfunction impacts the cardiovascular system through genomic and non-genomic effects. Understanding this interplay aids in comprehending heart failure and guiding therapy.

Related Experiment Videos

Area of Science:

  • Cardiovascular endocrinology
  • Thyroid hormone signaling

Background:

  • Thyroid dysfunction significantly impacts cardiovascular health.
  • Thyroid hormones exert both genomic and non-genomic effects on cardiovascular tissues.
  • System biology approaches are enhancing the understanding of thyroid-heart interactions.

Purpose of the Study:

  • To elucidate the complex interplay between thyroid function and the cardiovascular system.
  • To improve the understanding of the heart failure phenotype in relation to thyroid dysfunction.
  • To explore the prognostic and therapeutic implications of thyroid function testing in heart failure.

Main Methods:

  • Review of existing literature on thyroid hormone effects on the cardiovascular system.
  • Analysis of the relationship between thyroid function tests and heart failure.
  • Discussion of the role of non-thyroidal illness syndrome in prognostication.

Main Results:

  • Thyroid hormones influence cardiovascular structure and function via genomic and non-genomic pathways.
  • Disturbances in inotropic and chronotropic function are key symptoms of thyroid-related cardiovascular issues.
  • Biochemical markers of thyroid function, including non-thyroidal illness syndrome, offer prognostic value in heart failure.

Conclusions:

  • Thyroid dysfunction has profound cardiovascular consequences.
  • Understanding thyroid hormone actions is crucial for managing heart failure.
  • Emerging treatments involving thyroid hormone analogues or T3 are controversial but represent areas of active research.