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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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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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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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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Conduction System of the Heart01:20

Conduction System of the Heart

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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to...
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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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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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Idiopathic Annular Ventricular Arrhythmias.

Zachary T Yoneda1, William G Stevenson1

  • 1Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt University Medical Center Nashville, TN, US.

Arrhythmia & Electrophysiology Review
|January 7, 2025
PubMed
Summary
This summary is machine-generated.

This review details idiopathic arrhythmias from the mitral and tricuspid annuli. It highlights distinguishing features, ablation strategies, and pitfalls for these common ventricular arrhythmias.

Keywords:
Catheter ablationidiopathic arrhythmiasmitral annulustricuspid annulusventricular arrhythmias

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Arrhythmias

Background:

  • Idiopathic arrhythmias originating from the mitral and tricuspid annuli are frequently observed in clinical practice.
  • Distinguishing these idiopathic arrhythmias from those linked to structural heart disease is crucial for effective management.

Purpose of the Study:

  • To review the distinguishing features of ventricular arrhythmias arising from the mitral and tricuspid annuli.
  • To emphasize the importance of differentiating idiopathic arrhythmias from those associated with structural heart disease.
  • To discuss specific ablation strategies and potential pitfalls for each region of the annuli.

Main Methods:

  • Review of existing literature on idiopathic ventricular arrhythmias originating from the mitral and tricuspid annuli.
  • Detailed discussion of distinct anatomical regions, including the cardiac crux and para-Hisian region.
  • Analysis of ablation techniques and associated challenges for each identified region.

Main Results:

  • Identification of key features that differentiate idiopathic arrhythmias from those secondary to structural heart disease.
  • Comprehensive overview of ablation strategies tailored to specific sites within the mitral and tricuspid annuli.
  • Highlighting common pitfalls encountered during ablation procedures in these complex anatomical areas.

Conclusions:

  • Understanding the unique characteristics of idiopathic arrhythmias from the mitral and tricuspid annuli is essential.
  • Tailored ablation strategies are critical for successful treatment, with awareness of potential pitfalls.
  • The discussed ablation techniques offer broad applicability beyond idiopathic cases.