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Related Concept Videos

Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
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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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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 II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

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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

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

812
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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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

909
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
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Alcohol and Atrial Fibrillation.

Stanisław Surma1, Gregory Y H Lip2,3

  • 1Faculty of Medical Sciences in Katowice, Medical University of Silesia, 40-752 Katowice, Poland.

Reviews in Cardiovascular Medicine
|July 30, 2024
PubMed
Summary

Regular alcohol consumption, even in small amounts, increases atrial fibrillation (AF) risk. This review examines the complex link between alcohol intake and AF, challenging beliefs about moderate drinking

Keywords:
alcohol consumptionatrial fibrillationcardiovascular risk

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Area of Science:

  • Cardiology
  • Epidemiology
  • Public Health

Background:

  • Dietary habits, including alcohol consumption, are significant risk factors for atrial fibrillation (AF).
  • The relationship between alcohol and AF is complex, multifactorial, and subject to conflicting information regarding dose and type.
  • A common misconception is that moderate alcohol, particularly red wine, offers cardioprotective benefits, potentially encouraging wider alcohol use.

Purpose of the Study:

  • To review the epidemiological associations between alcohol consumption and atrial fibrillation (AF).
  • To explore the implications of alcohol intake on incident AF and AF-related outcomes.
  • To address the conflicting information surrounding alcohol's impact on AF risk.

Main Methods:

  • This study is a narrative review.
  • It synthesizes existing epidemiological data on alcohol consumption and AF.
  • The review examines various doses and types of alcohol in relation to AF risk.

Main Results:

  • Alcohol consumption is significantly associated with an increased risk of AF.
  • This association is observed in a gender-independent manner.
  • Even small, regular amounts of alcohol consumption elevate the risk of developing AF.

Conclusions:

  • Regular alcohol consumption is a significant risk factor for atrial fibrillation.
  • The belief in moderate alcohol's cardioprotective effects may be misleading regarding AF risk.
  • Further research and public health awareness are needed to clarify alcohol's role in AF etiology and outcomes.