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Related Concept Videos

Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

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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...
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Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

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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...
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Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

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Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
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Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

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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...
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Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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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...
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Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

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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,...
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Amiodarone-induced thyroid dysfunction--clinical picture. Study on 215 cases.

Cristina Preda, Ana Clara Aprotosoaie, A Petris

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    Amiodarone treatment can cause thyroid dysfunction in nearly 28% of patients, leading to hypothyroidism or hyperthyroidism. This thyroid dysfunction negatively impacts patients with heart disease, requiring treatment adjustments.

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    Area of Science:

    • Cardiology
    • Endocrinology
    • Pharmacology

    Background:

    • Amiodarone is an anti-arrhythmic drug frequently used for supra-ventricular and ventricular arrhythmias.
    • Thyroid dysfunction is a known potential side effect of amiodarone therapy.
    • Monitoring thyroid function is crucial in patients receiving amiodarone.

    Purpose of the Study:

    • To determine the prevalence of amiodarone-induced thyroid dysfunction.
    • To evaluate the clinical and evolutionary impact of thyroid damage in amiodarone-treated patients.
    • To assess the incidence of hypothyroidism and hyperthyroidism linked to amiodarone.

    Main Methods:

    • Retrospective study of 215 patients (90 men, 125 women; ages 35-87) treated with amiodarone.
    • Thyroid function was assessed either due to clinical symptoms or routine screening.
    • Diagnosis confirmed by hormonal assays (TSH, FT4, FT3), endocrinology consultation, and thyroid echography.

    Main Results:

    • Thyroid function assessment was clinically indicated in 27.80% of patients.
    • Amiodarone-induced hypothyroidism occurred in 20.85% of patients.
    • Amiodarone-induced hyperthyroidism was diagnosed in 6.95% of patients.

    Conclusions:

    • Amiodarone-induced thyroid dysfunction affects a significant portion of treated patients (27.8%).
    • Both hypothyroidism and hyperthyroidism negatively influence the clinical course of patients with underlying heart conditions.
    • Thyroid dysfunction necessitates careful management and potential modification of therapeutic regimens.