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Hyperthyroidism II: Pathophysiology

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...

Functions of Thyroid Hormones

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...

Hypothyroidism II: Pathophysiology

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...

Synthesis and Regulation of Thyroid Hormones

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...

The Thyroid Gland

The Thyroid Gland

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.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...

Hyperthyroidism I: Introduction

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...

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Updated: May 1, 2026

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

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

Published on: February 9, 2024

Thyroid and the heart.

Ira Martin Grais¹, James R Sowers²

¹Department of Medicine/Cardiology Division, Northwestern Feinberg School Medicine, Chicago, Ill.

The American Journal of Medicine

|March 26, 2014

Summary

Thyroid hormones are crucial for cardiovascular health. This review explores how thyroid dysfunction impacts cardiovascular disease, emphasizing monitoring thyroid-stimulating hormone in aging populations.

Keywords:

Atrial fibrillation Cardiac output Coronary artery disease Heart failure Peripheral vascular function Thyroid dysfunction

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

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Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model

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Isolation and Physiological Analysis of Mouse Cardiomyocytes

Isolation and Physiological Analysis of Mouse Cardiomyocytes

Published on: September 7, 2014

Area of Science:

Cardiovascular Physiology
Endocrinology

Background:

Thyroid hormones regulate cardiovascular development and function.
Thyroid function tests are essential in patients with cardiovascular disease.
Hypothyroidism, hypertension, and cardiovascular disease prevalence increase with age.

Purpose of the Study:

To review the effects of thyroid hormones on normal cardiovascular function.
To assess the role of overt and subclinical thyroid dysfunction in cardiovascular diseases.

Main Methods:

Literature review of contemporary understanding.
Analysis of the impact of thyroid hormonal status on cardiovascular physiology.

Main Results:

Thyroid hormones influence all cardiovascular system components.
Subclinical and overt thyroid dysfunction can contribute to cardiovascular disease.
Monitoring thyroid-stimulating hormone is vital for aging populations.

Conclusions:

Understanding thyroid hormone's cardiovascular impact aids clinical decision-making.
Integrated management of thyroid status and cardiovascular disease is recommended.
Further research into thyroid dysfunction and cardiovascular disease is warranted.