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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

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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

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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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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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
800
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

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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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Heart Failure Drugs: Inotropic Agents01:26

Heart Failure Drugs: Inotropic Agents

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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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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents
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Monitoring thyroid function during amiodarone use.

Priya Sharma1, Riyad Sheikh1, Nipuna Siribaddana1

  • 1Department of Diabetes and Endocrinology, King's Mill Hospital, Sutton-in-Ashfield, UK.

British Journal of Hospital Medicine (London, England : 2005)
|February 1, 2024
PubMed
Summary
This summary is machine-generated.

Amiodarone, an antiarrhythmic drug, can cause thyroid dysfunction, including thyrotoxicosis and hypothyroidism. Treatment varies by type of thyrotoxicosis and hypothyroidism, sometimes involving amiodarone cessation.

Keywords:
AmiodaroneHypothyroidismThyroidThyrotoxicosisThyroxine

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Area of Science:

  • Endocrinology
  • Cardiology

Background:

  • Amiodarone is a widely used antiarrhythmic medication for cardiac tachyarrhythmias.
  • Thyroid dysfunction is a significant adverse effect of amiodarone therapy.
  • Both thyrotoxicosis and hypothyroidism can arise from amiodarone use.

Purpose of the Study:

  • To outline the mechanisms and management of amiodarone-induced thyroid dysfunction.
  • To differentiate between types of amiodarone-induced thyrotoxicosis and their treatments.
  • To discuss the management of amiodarone-induced hypothyroidism.

Main Methods:

  • Review of amiodarone's effects on thyroid function.
  • Classification of amiodarone-induced thyrotoxicosis into Type 1 and Type 2.
  • Description of treatment strategies for each type of thyroid dysfunction.

Main Results:

  • Amiodarone-induced thyrotoxicosis (AIT) presents as Type 1 (in patients with pre-existing thyroid disease, treated with thionamides) or Type 2 (in patients without pre-existing thyroid disease, treated with glucocorticoids).
  • Amiodarone-induced hypothyroidism is managed with levothyroxine or, in some instances, amiodarone withdrawal.
  • Understanding the specific type of thyroid dysfunction is crucial for appropriate management.

Conclusions:

  • Amiodarone therapy necessitates careful monitoring for thyroid dysfunction.
  • Tailored treatment approaches are essential for managing amiodarone-induced thyrotoxicosis and hypothyroidism.
  • Clinical vigilance can mitigate the impact of amiodarone on thyroid health.