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Related Concept Videos

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...
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 I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
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...
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...

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Mixed Reality Assisted Radical Endoscopic Thyroidectomy
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Amiodarone therapy: don't forget thyroid.

Maseeh-uz-Zaman1, Nosheen Fatima, Zafar Sajjad

  • 1Department of Radiology, The Agha Khan University Hospital (AKUH), Karachi Institute of Radiotherapy And Nuclear Medicine (KIRAN), Karachi, Pakistan.

JPMA. the Journal of the Pakistan Medical Association
|July 7, 2012
PubMed
Summary
This summary is machine-generated.

Amiodarone effectively treats ventricular arrhythmias but can cause thyroid dysfunction due to its high iodine content and deiodinase inhibition. Careful prescribing and monitoring are essential for managing these thyroid side effects.

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Published on: September 24, 2021

Area of Science:

  • Cardiology
  • Endocrinology
  • Pharmacology

Background:

  • Amiodarone is a vital anti-arrhythmic medication for life-threatening ventricular tachyarrhythmias.
  • Thyroid dysfunction is a significant and common side effect of amiodarone therapy.
  • The drug's high iodine content and deiodinase inhibition contribute to thyroid issues.

Purpose of the Study:

  • To review the mechanisms and clinical spectrum of amiodarone-induced thyroid dysfunction.
  • To emphasize the need for rational prescribing and long-term patient follow-up.

Main Methods:

  • Literature review on amiodarone's pharmacology and thyroid effects.
  • Analysis of clinical presentations of amiodarone-induced thyroid dysfunction.
  • Discussion of management strategies and monitoring protocols.

Main Results:

  • Amiodarone therapy can lead to a range of thyroid function abnormalities, from subclinical to overt hypothyroidism and thyrotoxicosis.
  • The prolonged elimination half-life of amiodarone contributes to persistent risk and delayed onset of thyroid dysfunction.
  • Iodide excess and impaired thyroid hormone deiodinase activity are key pathophysiological mechanisms.

Conclusions:

  • Amiodarone-induced thyroid dysfunction is a clinically relevant complication requiring vigilant management.
  • Rational prescribing and continuous long-term monitoring are crucial for patient safety.
  • Understanding the drug's pharmacokinetic properties is essential for mitigating risks.