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

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

1.4K
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.
1.4K
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

1.9K
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...
1.9K
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

291
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...
291
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

288
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...
288
Conduction System of the Heart01:19

Conduction System of the Heart

11.5K
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...
11.5K
Conduction System of the Heart01:20

Conduction System of the Heart

2.5K
The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
2.5K

You might also read

Related Articles

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

Sort by
Same author

Association of Myocardial Degeneration With Delayed Recovery of Left Ventricular Function in Atrial Fibrillation-Induced Cardiomyopathy.

Circulation reports·2026
Same author

Catheter Ablation of ARVC Ventricular Tachycardia With a Reverse R-Wave Pattern Break in Lead V2.

JACC. Clinical electrophysiology·2026
Same author

Supravalvular catheter ablation of idiopathic ventricular tachycardia arising from the mitral annulus: a case report.

European heart journal. Case reports·2026
Same author

Active Fixation Quadripolar Left Ventricular Leads in Cardiac Resynchronization Therapy: Clinical Utility at Mid-Term Follow-Up.

Journal of cardiovascular electrophysiology·2026
Same author

Feasibility and outcomes of repeat epicardial access in arrhythmogenic right ventricular cardiomyopathy.

Heart rhythm·2026
Same author

Impaired Atrial Natriuretic Peptide Secretion as a Marker of Advanced Atrial Fibrillation.

Circulation reports·2026

Related Experiment Video

Updated: Nov 13, 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

10.7K

Bidirectional atrioventricular reentrant tachycardia using bilateral accessory pathways.

Daisuke Yakabe1, Yusuke Fukuyama1, Masahiro Araki1

  • 1Department of Cardiology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, Fukuoka, Japan.

Journal of Cardiology Cases
|March 15, 2021
PubMed
Summary
This summary is machine-generated.

This case study details a rare instance of Wolff-Parkinson-White syndrome with two accessory pathways. Catheter ablation successfully eliminated the pathways causing tachycardia.

Keywords:
Atrioventricular reentrant tachycardiaCatheter ablationElectrophysiologyMultiple accessory pathways

More Related Videos

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

15.0K
Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice
08:05

Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice

Published on: June 29, 2022

3.1K

Related Experiment Videos

Last Updated: Nov 13, 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

10.7K
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

15.0K
Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice
08:05

Optimization of Transesophageal Atrial Pacing to Assess Atrial Fibrillation Susceptibility in Mice

Published on: June 29, 2022

3.1K

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Case Reports

Background:

  • Wolff-Parkinson-White (WPW) syndrome is characterized by electrical conduction abnormalities.
  • Multiple accessory pathways (APs) are an uncommon finding in WPW syndrome.

Observation:

  • A 21-year-old male with manifest type B WPW syndrome presented with recurrent palpitations.
  • Electrophysiological study identified two distinct APs: one at the anterolateral tricuspid annulus and another at the lateral mitral annulus.

Findings:

  • Atrial and ventricular extrastimulation induced two distinct wide QRS tachycardias.
  • Tachycardias conducted via both identified APs in clockwise and counterclockwise pathways.
  • Successful catheter ablation eliminated both accessory pathways.

Implications:

  • This case highlights the rare occurrence of bilateral APs in WPW syndrome leading to complex tachycardia.
  • Understanding the electrophysiological mechanisms, including refractory period differences and lack of AV nodal retrograde conduction, is crucial.
  • Catheter ablation offers an effective treatment for such complex presentations.