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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...
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...
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...
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...
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...

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Reversible changes in brain glucose metabolism following thyroid function normalization in hyperthyroidism.

Q Miao1, S Zhang, Y H Guan

  • 1Division of Endocrinology and Metabolism, Department of Internal Medicine, Huashan Hospital, Shanghai Medical College, Fudan University, China.

AJNR. American Journal of Neuroradiology
|May 21, 2011
PubMed
Summary
This summary is machine-generated.

Hyperthyroidism causes brain metabolism changes, particularly in the frontal and temporal lobes. Antithyroid therapy can reverse some of these cerebral glucose metabolism deficits.

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Area of Science:

  • Neuroendocrinology
  • Brain Metabolism
  • Thyroid Disorders

Background:

  • Hyperthyroidism is associated with regional cerebral metabolic alterations.
  • The long-term effects of these endocrine-induced brain changes post-thyroid normalization remain unclear.

Purpose of the Study:

  • To investigate the relationship between regional cerebral glucose metabolism and thyroid hormone levels in hyperthyroid patients.
  • To determine if antithyroid therapy can reverse observed metabolic changes.

Main Methods:

  • Utilized brain FDG-PET scans to compare regional cerebral glucose metabolism in 10 new-onset hyperthyroid patients versus 20 controls.
  • Assessed emotional distress using the SAS and SDS.
  • Performed follow-up PET scans after methimazole treatment and thyroid function normalization.

Main Results:

  • Hyperthyroid patients showed reduced activity in limbic, frontal, and temporal lobes compared to controls.
  • Depression scores correlated positively with metabolism in the cingulate and paracentral lobule.
  • Normalized thyroid function led to increased metabolism in the left parahippocampal, fusiform, and right superior frontal gyri, linked to decreased FT3 and FT4 levels.

Conclusions:

  • Regional cerebral glucose metabolism changes in hyperthyroidism are linked to thyroid hormone levels.
  • Antithyroid therapy can partially reverse cerebral hypometabolism in these patients.