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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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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.
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The Thyroid Gland01:23

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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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.
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[Clinical procedure in amiodarone-induced thyroid dysfunction].

Monika Różycka-Kosmalska1, Renata Michalak2, Marcin Kosmalski3

  • 1Medical University of Lodz. Poland: Department of Electrocardiology, Chair of Cardiology and Cardiac Surgery.

Polski Merkuriusz Lekarski : Organ Polskiego Towarzystwa Lekarskiego
|February 19, 2016
PubMed
Summary

Amiodarone effectively treats arrhythmias but can cause thyroid dysfunction, including Amiodarone-Induced Thyrotoxicosis (AIT) and Amiodarone-Induced Hypothyroidism (AIH). Regular thyroid monitoring is crucial for managing these risks.

Keywords:
amiodaronethyroid glandthyrotoxicosis and hypothyroidism

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Area of Science:

  • Pharmacology
  • Endocrinology
  • Cardiology

Context:

  • Amiodarone is a widely used antiarrhythmic drug for various tachyarrhythmias.
  • It demonstrates high therapeutic efficacy in patients with normal or impaired left ventricular function.
  • Thyroid gland dysfunction is a significant limitation of amiodarone therapy.

Purpose:

  • To review the current understanding of thyroid function evaluation during amiodarone treatment.
  • To outline diagnostic and therapeutic procedures for amiodarone-induced thyroid dysfunction.
  • To emphasize the importance of individualized risk assessment for thyroid complications.

Summary:

  • Amiodarone therapy can lead to Amiodarone-Induced Thyrotoxicosis (AIT) and Amiodarone-Induced Hypothyroidism (AIH).
  • Monitoring thyroid function, particularly free triiodothyronine (fT3) levels, is essential before and during amiodarone treatment.
  • Regular screening every six months and immediate assessment upon suspected dysfunction are recommended.

Impact:

  • This review guides cardiologists and endocrinologists in managing amiodarone-treated patients.
  • It promotes early diagnosis and effective treatment of thyroid disturbances.
  • Optimizing amiodarone therapy while minimizing thyroid-related risks improves patient outcomes.