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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
Mitral Stenosis I: Introduction01:22

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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...
Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

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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Related Experiment Video

Updated: Jun 4, 2026

A Pacing-Controlled Procedure for the Assessment of Heart Rate-Dependent Diastolic Functions in Murine Heart Failure Models
07:49

A Pacing-Controlled Procedure for the Assessment of Heart Rate-Dependent Diastolic Functions in Murine Heart Failure Models

Published on: July 21, 2023

Right ventricular pacing impairs endothelial function in man.

Anna Maria Choy1, Henry H M Su, Douglas H J Elder

  • 1Centre for Cardiovascular and Lung Biology, University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, UK. a.choy@dundee.ac.uk

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|February 24, 2011
PubMed
Summary
This summary is machine-generated.

Right ventricular pacing negatively impacts vascular health and cardiac function. This study found that increased right ventricular pacing worsened endothelial function and reduced cardiac reserve during exercise in pacemaker patients.

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Area of Science:

  • Cardiology
  • Cardiovascular Physiology
  • Medical Device Research

Background:

  • Clinical trials indicate right ventricular pacing (RVP) is linked to poorer cardiovascular outcomes.
  • The precise mechanisms driving these negative effects remain unclear.
  • Understanding RVP's impact on vascular health and cardiac function is crucial for patient management.

Purpose of the Study:

  • To investigate the effects of RVP on endothelial function, ventricular wall stress, and cardiac reserve.
  • To compare outcomes between minimal RVP (RVP-min) and maximal RVP (RVP-max) in patients with dual-chamber pacemakers.

Main Methods:

  • A randomized crossover study involving 22 subjects with dual-chamber pacemakers.
  • Comparison of RVP-min (long atrioventricular delay) versus RVP-max (short atrioventricular delay).
  • Assessment of endothelial function via reactive hyperemia peripheral arterial tonometry and cardiac output using inert gas rebreathing.

Main Results:

  • Maximal RVP significantly increased pacing percentage compared to minimal RVP (90% vs. 15%, P < 0.001).
  • Endothelial function, measured by the reactive hyperemia peripheral arterial tonometry index, was significantly lower with RVP-max (P < 0.05).
  • Cardiac output during peak exercise was significantly reduced during RVP-max (P < 0.05), while B-type natriuretic peptide levels showed no significant difference.

Conclusions:

  • Right ventricular pacing is associated with impaired endothelial function.
  • Increased right ventricular pacing negatively affects cardiac reserve, particularly during exercise.
  • These findings highlight the detrimental effects of RVP on cardiovascular health.