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Related Concept Videos

Disturbances in Heart Rhythm01:29

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 heart...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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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...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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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...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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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...
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Updated: Feb 18, 2026

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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Ventricular Arrhythmias.

William F Dresen1, John D Ferguson1

  • 1Department of Cardiovascular Medicine, University of Virginia Medical Center, 1215 Lee Street, Charlottesville, VA 22908, USA.

Cardiology Clinics
|November 28, 2017
PubMed
Summary
This summary is machine-generated.

Ventricular tachycardia (VT) is a common, high-mortality arrhythmia. While implantable cardioverter-defibrillators and catheter ablation offer management benefits, they do not eliminate recurrent VT, highlighting ongoing treatment challenges.

Keywords:
Catheter ablationImplantable cardioverter-defibrillatorVentricular fibrillationVentricular tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Ventricular tachycardia (VT) is the most frequent wide complex tachycardia, carrying a significant mortality risk.
  • Accurate electrocardiographic analysis is crucial for diagnosing VT and guiding treatment strategies.

Purpose of the Study:

  • To review current diagnostic and therapeutic approaches for ventricular tachycardia.
  • To evaluate the role of implantable cardioverter-defibrillators and catheter ablation in managing VT.
  • To discuss the limitations and challenges in contemporary VT treatment.

Main Methods:

  • Review of existing literature on ventricular tachycardia diagnosis and management.
  • Analysis of the efficacy and limitations of antiarrhythmic agents, implantable cardioverter-defibrillators, and catheter ablation.
  • Discussion of long-term patient management strategies for VT.

Main Results:

  • Electrocardiography is essential for VT diagnosis and therapy direction.
  • Antiarrhythmic drugs reduce arrhythmia burden but lack proven mortality benefit.
  • Implantable cardioverter-defibrillators provide acute termination and valuable long-term management data.
  • Catheter ablation is effective but recurrence of VT is common.

Conclusions:

  • Current treatments for ventricular tachycardia, including ablation, are not always curative, leading to recurrent arrhythmias.
  • Implantable cardioverter-defibrillators play a key role in both acute management and long-term patient care for VT.
  • Further advancements are needed to improve long-term outcomes and reduce recurrence rates in ventricular tachycardia management.