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Related Concept Videos

Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

30
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...
30
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

26
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,...
26
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

28
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...
28
The Thyroid Gland01:23

The Thyroid Gland

7.0K
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...
7.0K
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

23
Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence...
23
Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

7.1K
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...
7.1K

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Related Experiment Video

Updated: May 2, 2026

Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model
04:14

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

Published on: October 6, 2023

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Thyroid inferno.

Amit Bhargava1, Manmeet Kaur2

  • 1Division of Endocrinology, University of Connecticut Health Center, Farmington, USA. abhargava99@yahoo.com

Connecticut Medicine
|March 8, 2014
PubMed
Summary
This summary is machine-generated.

Diagnosing hyperthyroidism requires careful patient evaluation. Doppler ultrasound offers valuable insights, potentially avoiding unnecessary invasive procedures for thyroid nodules.

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Area of Science:

  • Endocrinology
  • Radiology
  • Internal Medicine

Background:

  • Hyperthyroidism diagnosis relies on clinical assessment and can be complicated by incidental thyroid nodules found during workup.
  • Overutilization of thyroid ultrasound after abnormal thyroid function tests may shift focus from biochemical diagnosis to nodule evaluation.
  • Thyroid scans are often recommended for further imaging, but contraindications exist.

Observation:

  • A case study of a 28-year-old female with hyperthyroidism is presented.
  • The study highlights a specific clinical sign observed on Doppler ultrasound of the thyroid.
  • This sign provides crucial diagnostic information.

Findings:

  • Doppler ultrasound reveals specific signs that aid in hyperthyroidism diagnosis.
  • Recognizing these Doppler ultrasound findings can guide appropriate clinical decision-making.
  • This approach can help avoid unnecessary invasive diagnostic procedures.

Implications:

  • Physicians can leverage Doppler ultrasound findings to refine diagnostic strategies for hyperthyroidism.
  • Appropriate use of ultrasound, guided by specific Doppler signs, can streamline patient workup.
  • This may lead to more efficient and less invasive diagnosis and management of hyperthyroid patients.