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Related Concept Videos

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

Graves' Disease I: Introduction

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 in...
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...

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Related Experiment Video

Updated: Jun 23, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Hypothyroidism (primary).

Birte Nygaard1

  • 1University of Copenhagen, Copenhagen, Denmark.

BMJ Clinical Evidence
|May 20, 2009
PubMed
Summary
This summary is machine-generated.

This review examines treatments for overt and subclinical hypothyroidism, finding levothyroxine and combination therapy effective for managing thyroid hormone deficiency.

Related Experiment Videos

Last Updated: Jun 23, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Area of Science:

  • Endocrinology
  • Pharmacology
  • Clinical Medicine

Background:

  • Hypothyroidism disproportionately affects women, with incidence rates up to 40/10,000 annually, significantly higher than in men (6/10,000).
  • Understanding the prevalence and impact of hypothyroidism is crucial for public health initiatives and clinical practice.

Purpose of the Study:

  • To systematically review and synthesize evidence on the efficacy and safety of treatments for overt and subclinical hypothyroidism.
  • To answer key clinical questions regarding the effects of various therapeutic interventions.

Main Methods:

  • Conducted a systematic literature search of major databases (Medline, Embase, Cochrane Library) up to January 2007.
  • Included data from 17 systematic reviews, randomized controlled trials (RCTs), and observational studies.
  • Incorporated safety alerts from regulatory agencies like the FDA and MHRA.
  • Utilized the GRADE system to evaluate the quality of evidence for interventions.

Main Results:

  • Identified and evaluated interventions including levothyroxine monotherapy and combination therapy with levothyroxine and liothyronine.
  • Assessed the effectiveness and safety profiles of the reviewed treatments based on the GRADE criteria.
  • Synthesized findings from diverse study designs to provide a comprehensive overview.

Conclusions:

  • Levothyroxine and levothyroxine plus liothyronine are key interventions for managing hypothyroidism.
  • The review provides evidence-based information on the effectiveness and safety of these treatments.
  • This systematic review serves as a valuable resource for clinicians treating patients with thyroid dysfunction.