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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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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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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 III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

571
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...
571
Dysrhythmias VI: Management of Dysrhythmias01:25

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...
544
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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Related Experiment Video

Updated: Feb 25, 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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Supraventricular Tachycardia: Where to Ablate?

Colleen Johnson1, Melvin Scheinman

  • 1Division of Cardiology, Department of Cardiac Electrophysiology, University of California San Francisco, 500 Parnassus Avenue, MU 434, Box 1354, San Francisco, CA 94143, USA.

Cardiac Electrophysiology Clinics
|August 4, 2017
PubMed
Summary
This summary is machine-generated.

This study details a case of typical atrioventricular nodal reentrant tachycardia where ablation within the coronary sinus was successful. This approach is crucial when standard slow pathway modification for supraventricular tachycardia fails.

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Robotic Ablation of Atrial Fibrillation
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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Case Reports

Background:

  • Typical atrioventricular nodal reentrant tachycardia (AVNRT) is a common supraventricular tachycardia.
  • Standard treatment involves radiofrequency ablation targeting the slow pathway in the right atrium.
  • Atypical presentations may require alternative ablation strategies.

Purpose of the Study:

  • To present a case of AVNRT with eccentric atrial activation successfully treated by ablation within the coronary sinus.
  • To highlight the importance of considering alternative ablation sites when standard approaches are ineffective.

Main Methods:

  • Case report of a patient with drug-refractory typical AVNRT.
  • Electrophysiological study to map atrial activation and identify tachycardia mechanism.
  • Radiofrequency ablation targeting the slow pathway, with successful ablation within the coronary sinus.

Main Results:

  • The patient exhibited typical AVNRT with eccentric retrograde atrial activation.
  • Successful termination of tachycardia was achieved by ablation within the coronary sinus.
  • This site targeted left posterior nodal extensions.

Conclusions:

  • Ablation within the coronary sinus can be an effective strategy for AVNRT when standard right-sided approaches fail.
  • Left posterior nodal extensions in the coronary sinus or over the mitral annulus are important targets.
  • This case underscores the need for individualized ablation strategies in complex supraventricular tachycardia cases.