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Related Experiment Video

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Design of a Cyclic Pressure Bioreactor for the Ex Vivo Study of Aortic Heart Valves
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Elastin-Dependent Aortic Heart Valve Leaflet Curvature Changes During Cyclic Flexure.

Melake D Tesfamariam1, Asad M Mirza2, Daniel Chaparro3

  • 1Department of Biomedical Engineering, Florida International University, Miami, FL 33174, USA. mtesf003@fiu.edu.

Bioengineering (Basel, Switzerland)
|May 10, 2019
PubMed
Summary

Calcific aortic valve disease (CAVD) involves extracellular matrix (ECM) changes. Elastin degradation significantly increases aortic valve leaflet curvature, especially during maximum flexure, indicating potential early CAVD biomarkers.

Keywords:
aortic valvebiomarkercalcificationcurvatureearly detectionelastin degradationleaflet

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Tissue Mechanics

Background:

  • Calcific aortic valve disease (CAVD) involves extracellular matrix (ECM) remodeling, leading to valve dysfunction.
  • Elastin degradation is a known factor associated with CAVD progression and ECM abnormalities.

Purpose of the Study:

  • To investigate the relationship between aortic valve leaflet axial curvature and elastin degradation.
  • To identify potential biomarkers for early CAVD remodeling based on mechanical changes.

Main Methods:

  • Porcine aortic valve (AV) leaflets were enzymatically digested to degrade elastin.
  • Normal and elastin-degraded AV leaflet strips were subjected to cyclic flexure at 1 Hz.
  • Axial curvature changes were measured at different degrees of leaflet flexure.

Main Results:

  • Elastin-degraded AV leaflets exhibited a significant increase in mean axial curvature compared to controls.
  • The increase in mean curvature was most pronounced at maximum leaflet flexure.
  • Mean curvature measurements detected distinct spatial changes in ECM due to elastin loss.

Conclusions:

  • Mean axial curvature is a sensitive metric for detecting ECM alterations from elastin degradation in AV leaflets.
  • Measuring mean curvature at maximum leaflet flexure may serve as a potential biomarker for early CAVD.
  • This finding aids in understanding CAVD pathogenesis and developing diagnostic tools.