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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Conduction System of the Heart01:20

Conduction System of the Heart

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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
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Conduction System of the Heart01:19

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.
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Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
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The Cardiac Cycle01:13

The Cardiac Cycle

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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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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Conduction system pacing in TAVR patients requiring permanent pacemaker implantation.

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Substrate ablation as concomitant treatment for left atrial macroreentrant tachycardia (SLICE-LAMRT): rationale and study design.

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Optimized workflow for pentaspline PFA and its impact on PVI durability: evidence from systematic remapping.

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Related Experiment Video

Updated: Oct 31, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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Complete interatrial block in a left-atrial dependent atrioventricular node.

Javier Ramos Jiménez1, Álvaro Marco Del Castillo1, Daniel Rodríguez Muñoz1

  • 1Arrhythmia and Electrophysiology Unit, Cardiology Department, University Hospital 12 de Octubre, Madrid, Spain.

Journal of Cardiovascular Electrophysiology
|July 1, 2021
PubMed
Summary
This summary is machine-generated.

Electrophysiologic study revealed interatrial dissociation during radiofrequency ablation for atypical atrial flutter. The atrioventricular node became dependent on a left atrial rhythm, highlighting anatomical considerations during ablation.

Keywords:
Bachmann's bundleatrial dissociationatrial fluttercomplete heart blockinteratrial block

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Ablation

Background:

  • Recurrent atypical atrial flutter necessitates electrophysiologic study and potential ablation.
  • Radiofrequency ablation is a common treatment for complex atrial arrhythmias.

Observation:

  • During radiofrequency ablation of the cavotricuspid isthmus and anterior mitral line, unexpected findings occurred.
  • Energy delivery on the anterior left atrial wall led to interatrial dissociation.

Findings:

  • A complete block of sinus impulses to the atrioventricular (AV) node was observed.
  • AV node activation became reliant on a subsidiary left atrial rhythm, indicating altered cardiac conduction.

Implications:

  • Understanding intra- and inter-atrial connections is crucial for extensive ablation procedures.
  • Prior cardiac surgeries may increase the complexity and risk of such interatrial conduction abnormalities.