Related Experiment Video

Updated: Feb 28, 2026

Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure
07:41

Echocardiographic Evaluation of Atrial Communications before Transcatheter Closure

Published on: February 8, 2022

4.4K

[Changes in electrocardiographic parameters in children with complete left bundle branch block early after

Li Wei1, Yong-Yi Lu, Yi-Min Hua

  • 1Department of Pediatrics, West China Second University Hospital/Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, Sichuan University, Chengdu 610041, China. yeqianghua949@sohu.com.

Zhongguo Dang Dai Er Ke Za Zhi = Chinese Journal of Contemporary Pediatrics
|June 14, 2017
PubMed

Insights

Electrocardiographic parameters like left ventricular voltage and JTcd differ significantly in children with complete left bundle branch block (CLBBB) after ventricular septal defect (VSD) closure. JTcd may help predict CLBBB development post-VSD intervention.

Area of Science:

  • Pediatric Cardiology
  • Electrophysiology
  • Interventional Cardiology

Background:

  • Complete left bundle branch block (CLBBB) can occur after transcatheter closure of ventricular septal defects (VSDs).
  • Electrocardiographic (ECG) changes following VSD closure require further investigation, particularly in children with pre-existing CLBBB.

Purpose of the Study:

  • To evaluate changes in ECG parameters in pediatric patients with CLBBB after transcatheter VSD closure.
  • To compare ECG indices between children with and without CLBBB post-VSD intervention.

Main Methods:

  • A cohort of 21 children with CLBBB and 21 matched controls without arrhythmias were studied after perimembranous VSD transcatheter closure.
  • ECG parameters including left ventricular voltage, QT interval, and JT dispersion (JTcd) were measured before and at multiple time points after the procedure.

Main Results:

  • Left ventricular voltage and JTcd showed significant changes over time in both groups.
  • Significant differences in JTcd and left ventricular voltage were observed between the CLBBB and control groups post-procedure.

Conclusions:

  • Significant ECG differences, specifically in left ventricular voltage and JTcd, exist between pediatric VSD patients with and without CLBBB early after transcatheter closure.
  • JTcd may serve as a potential predictor for the early development of CLBBB following transcatheter VSD closure.
Abstract

More Related Videos

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing12:45

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

11.1K
Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System10:17

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

Published on: April 11, 2025

2.0K

Related Concept Videos

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...
675
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
7.6K
Mitral Stenosis II: Clinical features and Diagnostic Tests01:23

Mitral Stenosis II: Clinical features and Diagnostic Tests

Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...
360
Electrocardiogram01:29

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
7.1K
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
1.7K
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...
3.3K