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Related Experiment Videos

Arterial elastic modulus for fixed and varied wall volume

J Wheeldon1, M Hennes, H Stinnett

  • 1Department of Electrical Engineering, School of Engineering and Mines, University of North Dakota, Grand Forks 58202.

Biomedical Sciences Instrumentation
|January 1, 1993
PubMed
Summary

Blood vessel wall volume decreases with increasing pressure, contrary to common assumptions. This finding impacts the calculation of the elastic modulus (Em), revealing higher values when wall volume changes dynamically.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Computational Biology

Background:

  • Vascular mechanics research often assumes constant blood vessel wall volume under varying intraluminal pressures.
  • This assumption may influence the accuracy of biomechanical property calculations, such as elastic modulus.

Purpose of the Study:

  • To investigate the effect of decreasing blood vessel wall volume on elastic modulus (Em) calculations.
  • To compare results from models with constant versus variable wall volume under increasing load.

Main Methods:

  • Utilized two distinct computer models to simulate rabbit carotid artery mechanics.
  • Model 1: Constant wall volume, calculating thickness based on measured length and width.
  • Model 2: Variable wall volume, incorporating measured length, width, and thickness.

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Main Results:

  • Elastic modulus (Em) increased with rising load in both models.
  • The non-constant volume model yielded significantly higher Em values.
  • Differences in Em exceeded 100% at loads above 30% in the variable volume model.

Conclusions:

  • Blood vessel wall volume is not constant and decreases under increasing load.
  • Accounting for variable wall volume is crucial for accurate elastic modulus determination in vascular biomechanics.
  • The assumption of constant wall volume can lead to substantial underestimation of arterial stiffness.