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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...
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,...
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...
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...
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

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 indirectly block calcium...
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

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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Related Experiment Video

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Sterile Pericarditis in Aachener Minipigs As a Model for Atrial Myopathy and Atrial Fibrillation
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Sterile Pericarditis in Aachener Minipigs As a Model for Atrial Myopathy and Atrial Fibrillation

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[Amiodarone and thyroid].

V Maby-Mottet1, D Ollo, P Meyer

  • 1Service de médecine interne générale, HUG, 1211 Geneve 14. vanessa.mottet@hcuge.ch

Revue Medicale Suisse
|December 18, 2012
PubMed
Summary
This summary is machine-generated.

Amiodarone can cause thyroid dysfunction in about 20% of patients. Regular thyroid-stimulating hormone (TSH) monitoring is recommended to manage potential hypothyroidism or hyperthyroidism.

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Area of Science:

  • Endocrinology
  • Pharmacology

Context:

  • Amiodarone is an iodine-rich antiarrhythmic medication.
  • Thyroid dysfunction is a known side effect of amiodarone treatment.

Purpose:

  • To outline the impact of amiodarone on thyroid function.
  • To differentiate between hypothyroidism and hyperthyroidism induced by amiodarone.
  • To suggest management strategies for amiodarone-induced thyroid dysfunction.

Summary:

  • Amiodarone can cause mild thyroid function disturbances or overt thyroid dysfunction in 20% of patients.
  • Hypothyroidism, often managed with levothyroxine, is more common in non-iodine deficient areas.
  • Hyperthyroidism, prevalent in iodine-deficient regions, presents as Type I (iodine overload) or Type II (cytotoxic effect) and requires specific treatments like antithyroid drugs or glucocorticoids.

Impact:

  • Highlights the importance of regular thyroid-stimulating hormone (TSH) monitoring in patients on amiodarone.
  • Informs clinical practice regarding the diagnosis and management of amiodarone-induced thyroid disorders.
  • Emphasizes the need for individualized treatment approaches based on the type of thyroid dysfunction.