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Related Concept Videos

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

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

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 the heart's...
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...
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...
Heart Failure Drugs: Inotropic Agents01:26

Heart Failure Drugs: Inotropic Agents

Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...

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Zebra II as A Novel System to Record Electrophysiological Signals in Zebrafish
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Zebra II as A Novel System to Record Electrophysiological Signals in Zebrafish

Published on: August 16, 2024

Amiodarone and thyrotoxicosis: case reports.

Ana Beatriz Winter Tavares1, Simone Kalil de Paula, Mario Vaisman

  • 1Hospital Universitário Clementino Fraga Filho, UFRJ, Rio de Janeiro, RJ, Brasil. anabeatrizwinter@yahoo.com.br

Arquivos Brasileiros De Cardiologia
|January 13, 2011
PubMed
Summary

Amiodarone can cause thyroid dysfunction in up to 24% of users. While hypothyroidism is manageable, amiodarone-induced thyrotoxicosis presents a complex clinical challenge requiring careful evaluation and prompt treatment.

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Published on: August 16, 2024

Area of Science:

  • Endocrinology
  • Cardiology

Background:

  • Amiodarone is a widely used antiarrhythmic drug.
  • Thyroid dysfunction is a known side effect of amiodarone, affecting 2-24% of patients.
  • Amiodarone-induced hypothyroidism is generally manageable, but thyrotoxicosis poses significant clinical challenges.

Observation:

  • This study presents three distinct cases of amiodarone-induced thyrotoxicosis.
  • The cases highlight varied clinical presentations and laboratory findings.
  • Different therapeutic strategies were employed and discussed for each case.

Findings:

  • Amiodarone-induced thyrotoxicosis requires careful clinical and laboratory assessment.
  • Management approaches vary depending on the specific patient profile and presentation.
  • Prompt diagnosis and intervention are crucial for patients with high cardiovascular risk.

Implications:

  • Early and thorough patient evaluation before and during amiodarone therapy is essential.
  • Understanding the nuances of amiodarone-induced thyrotoxicosis aids in optimizing patient care.
  • Effective management strategies can mitigate risks in cardiovascular patients receiving amiodarone.