Related Experiment Video
Updated: Mar 7, 2026
07:11
Morphological and Functional Assessment of the Right Ventricle Using 3D Echocardiography
Published on: October 28, 2020
3.5K
Association between right ventricular systolic function and electromechanical delay in patients with right bundle
Dong Hyun Park1, Kyoung Im Cho1, Yoon Kyung Kim1
1Division of Cardiology, Department of Internal Medicine, Kosin University College of Medicine, Busan, Republic of Korea.
Journal of Cardiology
|February 28, 2017
Summary
Prolonged R
Area of Science:
- Cardiology
- Electrophysiology
- Echocardiography
Background:
- Right ventricle (RV) pressure/volume overload stresses the right bundle branch block (RBBB) network, potentially causing conduction delays.
- Prolonged R' wave duration in lead V1 may indicate reduced RV function in RBBB patients.
Purpose of the Study:
- To investigate the association between R' wave duration in lead V1 and RV dysfunction in patients with RBBB.
- To determine if R' wave duration can serve as a non-invasive marker for RV dysfunction.
Main Methods:
- Retrospective review of echocardiography and ECG data from RBBB patients (2013-2015).
- Measurement of QRS and R' wave duration from ECGs.
- RV systolic dysfunction defined as RV fractional area change (FAC) < 35%.
Main Results:
- Patients with RV dysfunction (n=123) had significantly prolonged QRS (145.3±19.3ms) and R' duration (102.9±12.0ms) compared to normal RV function (n=241).
- R' duration strongly correlated with RV FAC (r=-0.609), RV systolic pressure (r=0.142), RV dimension (r=0.193), and RV myocardial performance index (r=0.199).
- An R' duration ≥93ms in lead V1 predicted RV dysfunction with 90% sensitivity and 87% specificity.
Conclusions:
- Prolonged R' wave duration in lead V1 is a significant indicator of RV dysfunction.
- This ECG finding suggests RV pressure and/or volume overload in patients with RBBB.
More Related Videos
12:45Benefits 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
08:21Biventricular Assessment of Cardiac Function and Pressure-Volume Loops by Closed-Chest Catheterization in Mice
Published on: June 15, 2020
5.1K
Related Concept Videos
01:18Dysrhythmias IV: Characteristics of Bradyarrhythmias
698
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...
698
01:20Mitral Regurgitation I: Introduction
786
Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
786
01:22Mitral Stenosis I: Introduction
1.0K
Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
1.0K
01:22Aortic Regurgitation II: Clinical Features and Diagnostic Tests
718
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...
718
01:23Mitral Stenosis II: Clinical features and Diagnostic Tests
371
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...
371
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
588
Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
588