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Related Concept Videos

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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Electrophysiology of Normal Cardiac Rhythm01:19

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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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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Disturbances in Heart Rhythm01:28

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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.
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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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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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Related Experiment Video

Updated: Jul 10, 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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Conduction System Pacing for Cardiac Resynchronization Therapy.

Óscar Cano1,2,3, Javier Navarrete-Navarro1,3, Pablo Jover1,3

  • 1Electrophysiology Section, Cardiology Department, Hospital Universitari i Politècnic La Fe, Área de Enfermedades Cardiovasculares, Planta 4-Torre F. Av, Fernando Abril Martorell, 106, 46026 Valencia, Spain.

Journal of Cardiovascular Development and Disease
|November 24, 2023
PubMed
Summary
This summary is machine-generated.

New pacing methods, His bundle pacing (HBP) and left bundle branch area pacing (LBBAP), offer improved cardiac resynchronization therapy (CRT) for heart failure patients. These conduction system pacing (CSP) techniques aim to enhance CRT response rates compared to traditional biventricular pacing.

Keywords:
His bundle pacingcardiac resynchronization therapyconduction system pacingleft bundle branch pacing

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Cardiac resynchronization therapy (CRT) using biventricular pacing (BiVP-CRT) is a standard treatment for heart failure with reduced ejection fraction and wide QRS.
  • A significant portion of patients (up to one-third) do not respond adequately to BiVP-CRT.

Purpose of the Study:

  • To review the current advancements, limitations, and future prospects of conduction system pacing (CSP) for CRT.
  • To explore His bundle pacing (HBP) and left bundle branch area pacing (LBBAP) as physiological alternatives to conventional CRT.

Main Methods:

  • Review of current literature on conduction system pacing (CSP) techniques, including His bundle pacing (HBP) and left bundle branch area pacing (LBBAP).
  • Analysis of the mechanisms by which CSP aims to restore native ventricular electrical activation.
  • Evaluation of the safety and feasibility of CSP for CRT delivery.

Main Results:

  • Conduction system pacing (CSP), encompassing HBP and LBBAP, represents a promising approach for CRT.
  • These techniques aim to achieve CRT by restoring physiological ventricular activation through the native conduction system.
  • CSP has demonstrated safety and feasibility in the context of CRT.

Conclusions:

  • Conduction system pacing (CSP) offers a potentially more effective alternative for CRT delivery compared to traditional biventricular pacing.
  • HBP and LBBAP are emerging physiological pacing modalities that may improve CRT response rates.
  • Further research is warranted to fully elucidate the long-term benefits and optimize the application of CSP for CRT.