Related Experiment Video

Updated: Jul 17, 2026

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

Comparison of the electrocardiographic features of complete left bundle branch block in patients with ischemic and

Bulent Deveci1, Ozcan Ozeke, Mehmet Fatih Ozlu

  • 1Yuksek Ihtisas Education and Research Hospital, Cardiology, Ankara, Turkey.

Indian Pacing and Electrophysiology Journal
|January 20, 2007
PubMed

Insights

Differentiating ischemic (ILVD) from nonischemic left ventricular dysfunction (NILVD) using electrocardiogram (ECG) features with left bundle-branch block (LBBB) is challenging. While some ECG findings showed differences, they had poor value in distinguishing between ILVD and NILVD.

Area of Science:

  • Cardiology
  • Medical Diagnostics

Background:

  • Differentiating ischemic (ILVD) from nonischemic left ventricular dysfunction (NILVD) is crucial for patient prognosis and treatment.
  • Electrocardiogram (ECG) features in the presence of left bundle-branch block (LBBB) have a debated role in this differentiation.

Purpose of the Study:

  • To assess the utility of specific ECG features in differentiating ILVD from NILVD in patients with complete LBBB.

Main Methods:

  • Compared ECG features between two groups of patients with LBBB: one with ILVD (49 patients) and one with NILVD (49 patients).

Main Results:

  • Higher R wave voltage in V6 was observed in the NILVD group (p: 0.03).
  • ST-J point depression (>0.2 mV) in V6 was more frequent in the NILVD group (p: 0.001).
  • Notching in the S wave (V1-4) was more prevalent in the ILVD group (p: 0.03).

Conclusions:

  • Despite identifying some differentiating ECG findings, their overall value in distinguishing ILVD from NILVD in the context of complete LBBB was poor.
Abstract

More Related Videos

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

Evaluation of Left Ventricular Structure and Function using 3D Echocardiography06:34

Evaluation of Left Ventricular Structure and Function using 3D Echocardiography

Published on: October 28, 2020

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...
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...
Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
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 to...
Cardiac Catheterization III: Left Heart Catheterization01:24

Cardiac Catheterization III: Left Heart Catheterization

Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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 the T...