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Related Concept Videos

Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

59
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...
59
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

36
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...
36
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

33
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,...
33
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

49
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...
49
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

35
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...
35
Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

7.2K
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...
7.2K

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Minimal Invasive Resection of Large Retrosternal Thyroid Goiter
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[Thyrostatic treatment and its adverse effects].

A Dokupilová, J Payer

    Vnitrni Lekarstvi
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    This summary is machine-generated.

    Antithyroid drugs like propylthiouracil and methimazole inhibit thyroid hormone synthesis. While generally safe, they can cause rare serious side effects, particularly at higher initial doses.

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    Area of Science:

    • Endocrinology
    • Pharmacology

    Background:

    • Antithyroid drugs, specifically thionamides, are crucial in managing hyperthyroidism.
    • Propylthiouracil (PTU) and methimazole (MMI) are primary agents used in the United States, with MMI and its analogue carbimazole prevalent elsewhere.

    Purpose of the Study:

    • To elucidate the chemical structure and mechanism of action of thionamide antithyroid drugs.
    • To compare the therapeutic actions and potential side effects of PTU and MMI.

    Main Methods:

    • Review of the chemical structures of thionamides, focusing on sulfhydryl and thiourea groups.
    • Analysis of the inhibition of thyroid peroxidase-mediated iodination and hormone conversion.
    • Examination of reported clinical side effects and their incidence.

    Main Results:

    • Thionamides inhibit thyroid hormone synthesis by blocking iodination of thyroglobulin.
    • PTU uniquely inhibits peripheral conversion of thyroxine to triiodothyronine.
    • Clinically significant immunosuppressive effects are noted; serious side effects occur in less than 5% of patients, often early in treatment.

    Conclusions:

    • Thionamides are effective thyroid hormone synthesis inhibitors with distinct mechanisms.
    • PTU offers an additional benefit in blocking peripheral hormone conversion.
    • While generally well-tolerated, vigilance for side effects, especially during high-dose initiation, is warranted.