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Related Concept Videos

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...
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 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...
Goiter01:27

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Gestational transient thyrotoxicosis.

M Taha Albaar1, John M F Adam

  • 1Department of Internal Medicine, Faculty of Medicine, University of Hasanuddin - Dr. Wahidin Sudirohusodo Hospital, Makasar, Sulawesi.

Acta Medica Indonesiana
|April 25, 2009
PubMed
Summary
This summary is machine-generated.

Gestational transient thyrotoxicosis is a temporary, non-autoimmune hyperthyroidism in pregnancy, often linked to severe nausea and vomiting. It typically resolves without treatment, but medication may be needed for persistent symptoms.

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Area of Science:

  • Endocrinology
  • Obstetrics & Gynecology
  • Reproductive Medicine

Background:

  • Gestational transient thyrotoxicosis (GTT) is a non-autoimmune hyperthyroid state unique to pregnancy.
  • It is frequently associated with hyperemesis gravidarum, a severe form of nausea and vomiting during pregnancy.
  • Physiological thyroid changes in pregnancy, including elevated thyroxine-binding globulin and human chorionic gonadotropin (hCG) stimulation, contribute to its development.

Purpose of the Study:

  • To elucidate the pathophysiology of gestational transient thyrotoxicosis.
  • To outline diagnostic criteria for GTT.
  • To describe management strategies for GTT and associated hyperemesis gravidarum.

Main Methods:

  • Review of existing literature on GTT and thyroid function during pregnancy.
  • Analysis of diagnostic markers including thyroid hormones, physical examination findings, and thyroid autoantibodies.
  • Evaluation of treatment approaches based on symptom severity.

Main Results:

  • Human chorionic gonadotropin (hCG), acting as a thyroid-stimulating hormone (TSH) agonist, may stimulate the TSH receptor, increasing thyroid hormone production.
  • Diagnosis relies on excluding pre-existing hyperthyroidism, observing elevated thyroid hormones, normal physical signs of hyperthyroidism, and negative thyroid autoantibodies.
  • GTT usually requires no specific treatment unless hyperemesis gravidarum is severe.

Conclusions:

  • Gestational transient thyrotoxicosis is a self-limiting condition often linked to hCG levels.
  • Diagnosis requires careful exclusion of other thyroid disorders.
  • Management focuses on symptomatic relief, with anti-thyroid medication reserved for severe or prolonged cases.