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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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Cardiovascular Drugs: Classification based on Therapeutic Indications01:18

Cardiovascular Drugs: Classification based on Therapeutic Indications

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Cardiovascular diseases, encompassing a range of conditions, can significantly affect the heart's operations and the overall circulatory system. These conditions impair the heart's ability to pump blood, leading to a deficit in oxygen supply to crucial organs. Anomalies in the heart's electrical system, known as arrhythmias, can cause heartbeats to accelerate or slow down. Usually, heart rates increase during physical activity and decrease while resting or sleeping. However,...
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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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Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

836
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 Valves01:16

Heart Valves

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The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Related Experiment Video

Updated: Jul 5, 2025

Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation

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Cardiovascular Disease: Atrial Fibrillation and Atrial Flutter.

Robert L Gauer1, Joel M Guess1

  • 1Internal Medicine Residency Program - Womack Army Medical Center at Fort Liberty, North Carolina.

FP Essentials
|January 16, 2024
PubMed
Summary
This summary is machine-generated.

Atrial fibrillation (AF) and atrial flutter (AFL) are common heart rhythm disorders. Catheter ablation offers high success rates for both conditions, often surpassing medication effectiveness for AF management.

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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
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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
  • Internal Medicine

Background:

  • Atrial fibrillation (AF) is the most prevalent sustained cardiac arrhythmia in adults, affecting 21-33% lifetime.
  • Risk factors include age, hypertension, diabetes, sleep apnea, and high-endurance exercise.
  • Screening recommendations vary, but mobile monitoring devices aid patient self-detection.

Purpose of the Study:

  • To review current management strategies for atrial fibrillation and atrial flutter.
  • To highlight the efficacy of catheter ablation compared to pharmacotherapy.
  • To discuss anticoagulation guidelines and uncertainties post-ablation.

Main Methods:

  • Literature review of current guidelines and treatment outcomes for AF and AFL.
  • Analysis of success rates for catheter ablation versus pharmacotherapy.
  • Examination of anticoagulation protocols based on CHA2DS2-VASc scores.

Main Results:

  • Catheter ablation achieves up to 80% AF-free rates after 1-2 treatments, superior to pharmacotherapy.
  • Atrial flutter (AFL) management via catheter ablation exceeds 90% success.
  • Anticoagulation is crucial for AF patients based on CHA2DS2-VASc scores, especially around procedures.

Conclusions:

  • Catheter ablation is a highly effective, increasingly first-line therapy for both AF and AFL.
  • Anticoagulation remains critical for stroke prevention in AF patients.
  • Further research is needed on long-term anticoagulation post-successful ablation.