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Related Concept Videos

Cardiac Catheterization III: Left Heart Catheterization01:24

Cardiac Catheterization III: Left Heart Catheterization

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Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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Cardiomyopathy V: Interprofessional Care01:29

Cardiomyopathy V: Interprofessional Care

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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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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.
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 the...
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Cardiac Catheterization II: Right Heart Catheterization01:21

Cardiac Catheterization II: Right Heart Catheterization

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Right Heart Catheterization: An OverviewRight heart catheterization is an invasive diagnostic procedure that measures right-sided cardiac and pulmonary artery pressures, calculates cardiac output, and identifies intracardiac shunts. It provides detailed hemodynamic data essential for diagnosing and managing various cardiovascular conditions, such as pulmonary hypertension.Access SitesCommon access sites for right heart catheterization include the internal jugular vein in the neck region, the...
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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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Related Experiment Video

Updated: Oct 15, 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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Endocardial left ventricular pacing.

Mark K Elliott1,2, Vishal S Mehta3, Baldeep Singh Sidhu3,4

  • 1School of Biomedical Engineering and Imaging Sciences, St Thomas' Hospital, King's College London, SE1 7EH, London, UK. mark.elliott@kcl.ac.uk.

Herz
|October 25, 2021
PubMed
Summary
This summary is machine-generated.

Endocardial left ventricular (LV) pacing offers a promising alternative for heart failure patients unresponsive to cardiac resynchronization therapy (CRT). This approach may provide superior electrical and hemodynamic benefits compared to conventional CRT.

Keywords:
Cardiac resynchronization therapyConduction system pacingHeart failureHemodynamicsLeadless pacing

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Translational Rabbit Model of Chronic Cardiac Pacing
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Related Experiment Videos

Last Updated: Oct 15, 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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Translational Rabbit Model of Chronic Cardiac Pacing
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Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • Cardiac resynchronization therapy (CRT) is a standard treatment for heart failure with dyssynchrony.
  • A significant percentage of patients (30-50%) do not respond to conventional CRT.

Purpose of the Study:

  • To explore endocardial left ventricular (LV) pacing as an alternative to conventional CRT.
  • To compare the advantages and disadvantages of endocardial LV pacing with traditional CRT.
  • To review current evidence and future directions for endocardial LV pacing systems.

Main Methods:

  • Review of existing literature on endocardial LV pacing.
  • Comparison of electrical resynchronization and hemodynamic response data.
  • Discussion of lead-based and leadless endocardial pacing systems.

Main Results:

  • Endocardial LV pacing provides pacing flexibility, overcoming limitations of coronary sinus anatomy.
  • Evidence suggests superior electrical resynchronization and hemodynamic response compared to epicardial CRT.
  • Both lead-based and leadless systems are viable for endocardial LV pacing delivery.

Conclusions:

  • Endocardial LV pacing is a viable alternative for non-responders to CRT or patients with challenging anatomy.
  • This technology offers potential for improved patient outcomes in heart failure management.
  • Further research into novel endocardial pacing systems is warranted.