Related Experiment Video

Updated: Jan 3, 2026

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

28.4K

Electrophysiological features and radiofrequency catheter ablation of accessory pathways associated with

Daiji Takeuchi1, Keiko Toyohara1, Morio Shoda2

  • 1Department of Pediatric and Adult congenital Cardiology, Tokyo Women's Medical University, Tokyo, Japan.

Journal of Cardiovascular Electrophysiology
|November 15, 2019
PubMed

Insights

Catheter ablation effectively treats accessory pathways causing tachycardia in patients with atrioventricular discordance, with most procedures being successful and reducing perioperative arrhythmias before cardiac surgery.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Surgery

Background:

  • Atrioventricular (AV) discordance can be associated with accessory pathways (APs).
  • Characteristics and catheter ablation (CA) outcomes for APs in AV discordance are not well-documented.

Purpose of the Study:

  • To investigate the characteristics of APs in patients with AV discordance.
  • To evaluate the efficacy and safety of CA for atrioventricular reciprocating tachycardia (AVRT) in these patients.
  • To assess the impact of CA on perioperative outcomes in patients undergoing planned cardiac surgery.

Main Methods:

  • Retrospective analysis of 11 consecutive patients with AV discordance undergoing CA for AVRT.
  • Electrophysiological study to induce and map APs.
  • CA performed before planned cardiac surgery.
  • Assessment of acute success, complications, and perioperative SVT occurrence.

Main Results:

  • Orthodromic AVRT via AP was induced in 10 patients; no antidromic/duodromic AVRT observed.
  • 13 APs identified, predominantly around the tricuspid valve annulus (posteriorly, posterolaterally, posteroseptally).
  • 91% acute CA success in the first session; no major complications.
  • 7 of 8 patients undergoing surgery post-CA had no peri-/postoperative SVT.

Conclusions:

  • Accessory pathways in AV discordance are typically located around the anatomical tricuspid valve annulus.
  • Catheter ablation of APs in AV discordance is highly effective and recommended to reduce SVT risk.
  • Consider coexisting twin AVNs and other SVTs during CA in AV discordance.
Abstract

Keywords:
accessory pathwayatrioventricular discordanceatrioventricular tachycardiacorrected transposition of the great arteriesradiofrequency catheter ablationsupraventricular tachycardia

More Related Videos

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction06:57

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

15.2K
Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping08:19

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

Published on: February 22, 2018

10.4K

Related Concept Videos

Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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...
2.4K
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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...
398
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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.
1.6K
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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...
8.6K
Dysrhythmias III: Characteristics of Dysrhythmias01:29

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...
347
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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...
425