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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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Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

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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.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
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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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Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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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.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

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Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
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[AMIODARONE AND THE THYROID FUNCTION].

Tomislav Jukić, Marija Punda, Maja Franceschi

    Lijecnicki Vjesnik
    |September 19, 2015
    PubMed
    Summary

    Amiodarone, an iodine-rich antiarrhythmic, can cause thyroid dysfunction like hypothyroidism and thyrotoxicosis. Dronedarone, a similar but iodine-free drug, may offer a safer alternative for high-risk patients.

    Area of Science:

    • Cardiology
    • Endocrinology
    • Pharmacology

    Background:

    • Amiodarone is an effective antiarrhythmic containing significant iodine.
    • Its use is associated with various thyroid abnormalities, including amiodarone-induced hypothyroidism (AIH) and amiodarone-induced thyrotoxicosis (AIT).
    • AIT presents in two forms: AIT I (hyperthyroidism) and AIT II (thyroiditis), requiring distinct management strategies.

    Purpose of the Study:

    • To review the thyroidal effects of amiodarone.
    • To outline the treatment approaches for amiodarone-induced thyroid dysfunction.
    • To introduce dronedarone as a potential alternative with a potentially improved safety profile regarding thyroid function.

    Main Methods:

    • Literature review of amiodarone and dronedarone effects on thyroid function.

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  • Analysis of treatment modalities for AIH and AIT.
  • Comparison of amiodarone and dronedarone properties relevant to thyroid health.

    • Main Results:

    • Amiodarone frequently causes thyroid dysfunction, necessitating careful monitoring.
    • AIH is managed with L-thyroxine, while AIT I and AIT II require specific treatments (antithyroid drugs/surgery/radioiodine for AIT I; glucocorticoids for AIT II).
    • Dronedarone, lacking iodine, presents a lower risk for thyroid adverse events compared to amiodarone.

    Conclusions:

    • Amiodarone treatment requires vigilant thyroid monitoring due to its high iodine content and associated risks.
    • Dronedarone offers a promising alternative for patients at risk of amiodarone-induced thyroid dysfunction.
    • Understanding the distinct management of AIT subtypes is crucial for effective patient care.