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Related Concept Videos

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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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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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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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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.
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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Related Experiment Video

Updated: Jun 21, 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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Atrioventricular Synchrony Delivered by a Dual-Chamber Leadless Pacemaker System.

James E Ip1, Mayer Rashtian2, Derek V Exner3

  • 1Weill Cornell Medicine/ New York Presbyterian Hospital, New York, NY (J.E.I.).

Circulation
|July 8, 2024
PubMed
Summary

This dual-chamber leadless pacemaker system achieves 98% atrioventricular synchrony, maintaining performance across various activities and heart rates. The wireless system ensures reliable beat-to-beat communication for effective pacing.

Keywords:
artificialpacemaker

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Area of Science:

  • Cardiovascular medicine
  • Biomedical engineering
  • Implantable electronic devices

Background:

  • A novel dual-chamber leadless pacemaker system utilizes wireless implant-to-implant (i2i) communication for atrioventricular (AV) synchronous pacing.
  • Systematic evaluation of AV synchrony during ambulatory conditions is crucial for leadless pacing technologies.

Purpose of the Study:

  • To assess the efficacy of a dual-chamber leadless pacemaker system in achieving and maintaining atrioventricular synchrony.
  • To evaluate AV synchrony across diverse patient postures and activities.

Main Methods:

  • A prospective, single-arm, multicenter clinical trial enrolled patients requiring dual-chamber pacing.
  • Implanted leadless pacemaker systems were evaluated using 12-lead Holter ECGs at 3 months post-implantation.
  • Atrioventricular synchrony was adjudicated based on a 300-millisecond PR interval, alongside assessment of i2i communication success rates.

Main Results:

  • The study evaluated 384 patients, with 98% of beats demonstrating AV synchrony across all postures using the standard 300-millisecond limit.
  • AV synchrony exceeded both atrial-to-ventricular and ventricular-to-atrial i2i communication success rates (94%) in 95% of patients.
  • High AV synchrony (>95%) was maintained across all postures, activities, implantation indications, and heart rate ranges, including those exceeding 100 bpm.

Conclusions:

  • The dual-chamber leadless pacemaker system effectively achieved high atrioventricular synchrony (98% of beats) at 3 months post-implantation.
  • AV synchrony remained robust across various ambulatory scenarios and elevated heart rates (>100 bpm).
  • This technology shows promise for leadless cardiac pacing with reliable AV synchrony.