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Related Concept Videos

Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

554
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...
554

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Endothelial Function in Patients With Continuous-Flow Left Ventricular Assist Devices.

Pavel Poredos1,2, Mateja K Jezovnik1, Rajko Radovancevic1

  • 1Department of Advanced Cardiopulmonary Therapies and Transplantation, Center for Advanced Heart Failure, 12340The University of Texas Health Science Center at Houston, Houston, TX, USA.

Angiology
|August 8, 2020
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Summary

Heart failure impairs blood flow and endothelial function. Continuous-flow left ventricular assist devices (cf-LVADs) may worsen endothelial dysfunction, unlike older pulsatile devices that could preserve it.

Keywords:
endothelial functionleft ventricular assist devicemicrocirculationpulseshear stress

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Area of Science:

  • Cardiovascular Science
  • Biomedical Engineering
  • Physiology

Background:

  • Endothelial cells are vital for cardiovascular homeostasis, regulating blood flow and tissue perfusion via shear stress.
  • Heart failure reduces cardiac output, leading to diminished blood flow, negative shear stress, and subsequent endothelial dysfunction.
  • Endothelial dysfunction contributes to heart failure progression and cardiovascular events.

Purpose of the Study:

  • To investigate the impact of continuous-flow left ventricular assist devices (cf-LVADs) on endothelial function in advanced heart failure.
  • To compare the effects of cf-LVADs with older pulsatile LVADs on endothelial function and vascular complications.

Main Methods:

  • Review of existing literature on endothelial function in heart failure and LVAD therapy.
  • Analysis of pathogenetic mechanisms linking cf-LVADs to endothelial dysfunction.
  • Comparison of hemodynamic effects between pulsatile and continuous-flow LVADs.

Main Results:

  • Reduced shear stress in heart failure patients impairs endothelial function, increasing oxidative stress and decreasing nitric oxide bioavailability.
  • Continuous-flow LVADs, despite improving cardiac output, may lead to persistent or worsened endothelial dysfunction due to loss of pulsatility.
  • Pulsatile LVADs may preserve endothelial function by mimicking physiological blood flow patterns.

Conclusions:

  • Endothelial dysfunction is a significant factor in the progression of heart failure and cardiovascular events.
  • The shift from pulsatile to continuous-flow LVADs may introduce or exacerbate endothelial dysfunction, contributing to vascular complications.
  • Preserving pulsatility in LVADs could be crucial for maintaining endothelial health in advanced heart failure patients.