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

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 VI: Management of Dysrhythmias

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...

Dysrhythmias III: Characteristics of Dysrhythmias

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 Tachyarrhythmias

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 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...

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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Related Experiment Video

Updated: Jun 4, 2026

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

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 tachycardia ablation: indications and techniques.

A P Wijnmaalen¹, K Zeppenfeld

¹Leiden University Medical Center, Leiden, The Netherlands.

Minerva Cardioangiologica

|March 4, 2011

Summary

Catheter ablation is increasingly used for ventricular tachycardia (VT), offering high success for non-scar VT and improved options for scar-related VT through advanced techniques.

Area of Science:

Cardiology
Electrophysiology
Medical Devices

Background:

Catheter ablation for ventricular tachycardia (VT) has expanded due to improved techniques and broadened indications.
It is a first-line therapy for symptomatic idiopathic VT and VT causing ventricular dysfunction.
Treating scar-related VT requires careful consideration of patient factors and operator experience.

Purpose of the Study:

To review the advancements in catheter ablation techniques for various types of VT.
To highlight the importance of understanding VT substrate for effective ablation.
To discuss the impact of new technologies on treating VT in structural heart disease.

Main Methods:

Review of current literature and techniques in catheter ablation for VT.

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Robotic Ablation of Atrial Fibrillation

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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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Robotic Ablation of Atrial Fibrillation

Robotic Ablation of Atrial Fibrillation

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Discussion of substrate-based approaches, irrigated tip ablation, and epicardial access.

Emphasis on substrate imaging and mapping for VT identification.

Main Results:

High success rates for non-scar related ventricular arrhythmias (VA) establish catheter ablation as a primary treatment.
Substrate-based techniques, irrigated ablation, and epicardial approaches have improved VT treatment in structural heart disease.
Understanding VT substrate is crucial for successful mapping and ablation, with imaging advances guiding future procedures.

Conclusions:

Catheter ablation is a vital therapy for diverse VT types, with ongoing advancements enhancing its efficacy.
Distinguishing scar-related from non-scar related VT is critical for treatment strategy and prognosis.
New catheter technologies and energy sources hold promise for overcoming limitations in VT ablation, particularly anatomical challenges.