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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...
898
Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

1
Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
1
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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Mitral Valve Prolapse II: Assessment and Management01:22

Mitral Valve Prolapse II: Assessment and Management

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IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular...
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Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

775
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

Updated: Jun 5, 2025

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
28:13

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Atrial Fibrillation: A Review.

Darae Ko1,2,3, Mina K Chung4,5,6, Peter T Evans2

  • 1Hinda and Arthur Marcus Institute for Aging Research, Hebrew SeniorLife, Harvard Medical School, Boston, Massachusetts.

JAMA
|December 16, 2024
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Summary

Atrial fibrillation (AF) increases stroke and mortality risk. Lifestyle changes and anticoagulants are key for prevention, while catheter ablation offers rhythm control for select patients.

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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
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Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Atrial fibrillation (AF) affects over 10 million US adults, significantly raising risks of stroke, heart failure, and mortality.
  • AF detection occurs through clinical encounters, wearables, or implanted devices; intermittent AF can be identified using implantable loop recorders.

Purpose of the Study:

  • To outline the 2023 ACC/AHA/ACCP/HRS guidelines for AF management.
  • To emphasize lifestyle modifications and anticoagulation strategies for AF prevention and complication reduction.
  • To detail rhythm control options, including catheter ablation, for specific AF patient populations.

Main Methods:

  • The guidelines propose 4 stages of AF evolution: at risk, pre-AF, paroxysmal/persistent AF, and permanent AF.
  • Risk stratification for stroke and thromboembolic events informs anticoagulation decisions.
  • Evaluation of rhythm control strategies, including antiarrhythmic drugs and catheter ablation, for symptomatic and heart failure patients.

Main Results:

  • Lifestyle modifications (weight loss, exercise) are recommended for all AF stages.
  • Oral anticoagulants (direct oral anticoagulants preferred over warfarin) reduce stroke risk by 60-80% in high-risk patients.
  • Catheter ablation is a first-line therapy for symptomatic paroxysmal AF and recommended for AF with heart failure with reduced ejection fraction (HFrEF).

Conclusions:

  • AF management requires a multi-faceted approach including risk factor modification, anticoagulation, and early rhythm control.
  • Direct oral anticoagulants are preferred for stroke prevention due to lower bleeding risks compared to warfarin.
  • Catheter ablation improves outcomes in specific AF patient groups, enhancing quality of life and cardiovascular health.