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Mitral Regurgitation I: Introduction01:20

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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...
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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...
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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...
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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...
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Exercise left ventricular ejection fraction predicts events in right bundle branch block.

Jesús Peteiro1, Alberto Bouzas-Mosquera1, Javier Broullón2

  • 1a Department of Cardiology , Complejo Hospitalario Universitario de A Coruña (CHUAC), Universidad de A Coruña e Instituto de Investigacion Biomedica de A Coruña (INIBIC) , A Coruña , Spain ;

Scandinavian Cardiovascular Journal : SCJ
|December 5, 2015
PubMed
Summary

Exercise echocardiography can predict outcomes in patients with right bundle branch block (RBBB). A decrease in left ventricular ejection fraction (LVEF) during exercise indicates a higher risk of adverse events in these individuals.

Keywords:
Exercise echocardiographyprognosisright bundle branch block

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Area of Science:

  • Cardiology
  • Diagnostic Imaging
  • Clinical Prognostics

Background:

  • Interpreting electrocardiograms (ECG) during exercise is challenging for patients with right bundle branch block (RBBB).
  • The prognostic value of exercise echocardiography (ExE) in RBBB patients with known or suspected coronary disease remains understudied.

Purpose of the Study:

  • To evaluate the prognostic capability of exercise echocardiography (ExE) in patients diagnosed with right bundle branch block (RBBB).
  • To identify predictors of adverse cardiovascular events in this specific patient cohort.

Main Methods:

  • Retrospective analysis of 703 patients with RBBB undergoing clinically indicated ExE.
  • Primary endpoints included overall mortality and a composite of myocardial infarction and cardiovascular mortality.
  • Follow-up duration was 4.1 ± 4.5 years.

Main Results:

  • Independent predictors of adverse events were coronary artery disease history, resting wall motion score index, metabolic equivalents, and changes in double product and left ventricular ejection fraction (LVEF) with exercise.
  • Neither clinical nor ECG exercise testing predicted outcomes.
  • Patients with a decrease in LVEF during exercise had significantly higher rates of combined events (3.3% for ΔLVEF > 5% to 8.2% for ΔLVEF < 1%).

Conclusions:

  • A decline in left ventricular ejection fraction (LVEF) during exercise is a significant predictor of major adverse cardiovascular events in patients with right bundle branch block (RBBB).
  • Exercise echocardiography provides valuable prognostic information in this population, beyond traditional ECG or clinical assessments.