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Related Concept Videos

Disturbances in Heart Rhythm01:28

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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
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Conduction System of the Heart01:19

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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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Mechanism of Cardiac Arrhythmias01:28

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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: Jun 2, 2025

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction

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Site-Specific Ventricular Tachycardia Inducibility.

Asad A Aboud1, Robert L Abraham2, Oluwaseun Adeola3

  • 1Saint Thomas West Heart Center, Nashville, Tennessee, USA.

JACC. Clinical Electrophysiology
|January 17, 2025
PubMed
Summary
This summary is machine-generated.

Programmed electrical stimulation (PES) can fail to induce ventricular tachycardia (VT) from standard sites. Alternative pacing locations may be necessary for VT induction in some patients, as shown by patient data and simulations.

Keywords:
VT ablationVT simulationprogrammed electric stimulationsite-specific inductionventricular tachycardia

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Area of Science:

  • Cardiac Electrophysiology
  • Medical Device Technology
  • Computational Biology

Background:

  • Programmed electrical stimulation (PES) is crucial for ventricular tachycardia (VT) ablation.
  • VT inducibility during PES is inconsistent, with unclear reasons for failure.

Purpose of the Study:

  • To investigate pacing site-specific failures in inducing scar-related VT using PES.
  • To explore mechanistic explanations for PES-induced VT failure via computer simulation.

Main Methods:

  • Reviewed six patients with failed VT induction from traditional right ventricular (RV) sites but successful induction from non-traditional sites.
  • Conducted computer simulations to study re-entry initiation by PES at various sites around a re-entry circuit.

Main Results:

  • Identified six patients with no inducible sustained VT from RV apex/outflow tract, but easily inducible VT from left ventricular (LV), basal RV, or epicardial sites.
  • In five patients, the VT-inducing site was closer to the re-entry circuit.
  • Simulations showed pacing site proximity to circuit isthmus influences re-entry initiation by affecting recovery time.

Conclusions:

  • The PES site significantly impacts VT inducibility, with standard RV sites sometimes failing to induce clinically relevant VTs.
  • Alternative pacing site stimulation is a viable strategy for selected patients.
  • Further research is needed to determine the frequency of this phenomenon.