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Related Concept Videos

Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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...
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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Updated: Jun 20, 2026

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
06:57

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

Published on: January 31, 2019

Ventricular scars and ventricular tachycardia.

William G Stevenson1

  • 1Cardiovascular Division, Brigham and Women's Hospital, 75 Francis St, Boston, MA 02115, USA. wstevenson@partners.org

Transactions of the American Clinical and Climatological Association
|September 22, 2009
PubMed
Summary
This summary is machine-generated.

Ventricular tachycardia (VT), a dangerous heart rhythm, often stems from ventricular scars. Understanding this link improves risk identification and guides new ablation therapies for heart disease patients.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Pathophysiology

Background:

  • Ventricular tachycardia (VT) is a critical arrhythmia linked to various heart diseases and sudden cardiac death.
  • Ventricular scarring, resulting from infarction or fibrosis, frequently serves as the substrate for reentrant VT.
  • The pathophysiologic connection between ventricular scars and VT is crucial for understanding arrhythmia mechanisms.

Purpose of the Study:

  • To elucidate the pathophysiologic link between ventricular scars and ventricular tachycardia.
  • To inform strategies for identifying patients at risk for VT.
  • To guide the development of novel diagnostic and therapeutic approaches for VT management.

Main Methods:

  • Review of existing literature on ventricular tachycardia pathophysiology.
  • Analysis of the role of ventricular scarring in arrhythmia generation.
  • Evaluation of current and emerging ablation techniques targeting scar substrate.

Main Results:

  • Ventricular scars are a primary substrate for reentrant ventricular tachycardia.
  • Understanding scar-arrhythmia substrate facilitates risk stratification.
  • Current ablation methods can effectively target scar-related VT, even in complex heart disease.

Conclusions:

  • The pathophysiologic understanding of ventricular scar-mediated VT is essential for clinical practice.
  • This knowledge supports targeted patient identification and risk assessment.
  • Future strategies for VT diagnosis and therapy can be advanced by focusing on the scar substrate.