Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

259
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...
259
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

225
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...
225
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

1.8K
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...
1.8K
Conduction System of the Heart01:19

Conduction System of the Heart

11.2K
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.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
11.2K
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

7.8K
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
7.8K
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

207
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...
207

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Dual conduction in an atriofascicular pathway.

Indian pacing and electrophysiology journal·2026
Same author

Indian society of electrocardiology position statement on improving CPR awareness in the Indian public.

Indian heart journal·2026
Same author

A rare case of Amyand's hernia presenting as an appendicular mucocele, extending into retroperitoneum: a case report.

Journal of visualized surgery·2026
Same author

Unusual presentation of jejunal carcinoid tumor with intussusception and vertebral metastasis: a case report.

Discover oncology·2026
Same author

AVRNT Associated With an Unusual Pathway Involving the Anterior LA Adjacent to Non-CS of AV.

JACC. Clinical electrophysiology·2026
Same author

Establishing a national cardiopulmonary resuscitation program in Indian high schools and colleges: An expert collaborative call to action and implementation model.

Heart rhythm·2026

Related Experiment Video

Updated: Nov 1, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Published on: December 11, 2017

10.6K

QRS alternans during right ventricular pacing while ablating a concealed left sided accessory pathway.

Raghav Bansal1, Ramalingam Vadivelu2, Eduardo Back Sternick3

  • 1Assistant Professor Cardiology, All India Institute of Medical Sciences, New Delhi, India.

Indian Pacing and Electrophysiology Journal
|June 22, 2021
PubMed
Summary

A concealed accessory pathway was identified in a young patient with narrow complex tachycardia. Mapping revealed its location, and unusual responses during ventricular pacing were observed and discussed.

Keywords:
Catheter induced bigeminyLeft free wall accessory pathwayQRS alternansRadiofrequency ablation

More Related Videos

Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
09:13

Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures

Published on: April 21, 2013

28.1K
Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
10:17

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

1.1K

Related Experiment Videos

Last Updated: Nov 1, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Published on: December 11, 2017

10.6K
Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
09:13

Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures

Published on: April 21, 2013

28.1K
Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
10:17

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

1.1K

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Electrophysiology

Background:

  • Supraventricular tachycardia is a common arrhythmia in young individuals.
  • Accessory pathways can cause reentrant tachycardias, including narrow complex tachycardia.
  • Accurate localization and understanding of accessory pathway behavior are crucial for effective treatment.

Purpose of the Study:

  • To report a case of concealed left lateral accessory pathway in a 16-year-old boy.
  • To describe the electrophysiological characteristics and mapping of the accessory pathway.
  • To discuss the potential mechanisms behind an unusual response to ventricular stimulation.

Main Methods:

  • Electrophysiological study including programmed ventricular stimulation.
  • Mapping of the accessory pathway using a His bundle catheter in the right ventricular outflow tract.
  • Analysis of atrial and ventricular activation sequences during tachycardia and pacing.

Main Results:

  • A concealed left lateral accessory pathway was diagnosed.
  • An eccentric atrial activation sequence was observed during tachycardia and right ventricular pacing.
  • The pathway was successfully mapped to the left posterior mitral vestibule.
  • An unusual QRS complex alternation was noted during ventricular stimulation.

Conclusions:

  • Concealed accessory pathways can present with regular narrow complex tachycardia.
  • Detailed electrophysiological mapping is essential for precise localization.
  • Unusual responses during ventricular pacing may provide insights into pathway properties and potential mechanisms.