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Related Concept Videos

Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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 of...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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...
Conduction System of the Heart01:19

Conduction System of the Heart

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...
Conduction System of the Heart01:20

Conduction System of the Heart

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:...
The Cardiac Cycle01:13

The Cardiac Cycle

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 empty blood into the...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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 heart...

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Related Experiment Video

Updated: May 16, 2026

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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Biventricular pacing in normal hearts.

Tariq Bhat1, Sumaya Teli, James Lafferty

  • 1Department of Medicine, Staten Island University Hospital, Staten Island, NY, USA.

Reviews in Cardiovascular Medicine
|November 20, 2012
PubMed
Summary
This summary is machine-generated.

Pacemakers have advanced significantly, but prolonged right ventricle apex pacing can cause heart dysfunction. Biventricular pacing offers a promising alternative for safer, long-term cardiac pacing.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Pacemakers are highly successful medical interventions, evolving over 50 years.
  • There's a need to improve patient quality of life and reduce mortality/safety risks.
  • Prolonged right ventricle apex (RVA) pacing is linked to left ventricular dysfunction and desynchronization.

Purpose of the Study:

  • To explore alternative pacing strategies beyond traditional RVA pacing.
  • To investigate methods for avoiding excessive RVA pacing.
  • To evaluate biventricular pacing as a safe, long-term solution.

Main Methods:

  • Review of existing literature on pacemaker evolution and pacing-induced cardiac dysfunction.
  • Analysis of evidence linking RVA pacing to negative cardiac outcomes.
  • Assessment of biventricular pacing as an alternative strategy.

Main Results:

  • Traditional RVA pacing can lead to significant cardiac desynchronization and dysfunction.
  • Alternative pacing methods are being developed to mitigate these risks.
  • Biventricular pacing shows potential for improved cardiac synchrony and long-term safety.

Conclusions:

  • Biventricular pacing is an emerging and attractive option for long-term cardiac pacing.
  • Reducing reliance on RVA pacing is crucial for preserving cardiac function.
  • Further research into advanced pacing techniques is warranted to enhance patient outcomes.