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Related Experiment Videos

Assessment of distributed arterial network models

P Segers1, N Stergiopulos, P Verdonck

  • 1Hydraulics Laboratory, IBITECH, University of Gent, Belgium.

Medical & Biological Engineering & Computing
|April 16, 1998
PubMed
Summary

This study compared linear and non-linear arterial models, finding that terminal impedance representation is crucial for peripheral pressure accuracy. Model differences impact wave contours, but terminal impedance is more significant than linear vs. non-linear distinctions.

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Area of Science:

  • Cardiovascular Physiology
  • Computational Fluid Dynamics
  • Biomedical Engineering

Background:

  • Arterial network models are essential for understanding blood flow dynamics.
  • Evaluating the impact of model simplifications (linear vs. non-linear) is critical for accurate physiological predictions.

Purpose of the Study:

  • To assess the relative importance of elastic non-linearities, viscoelasticity, and resistance vessel modeling in arterial pressure and flow wave computations.
  • To compare computational results from non-linear (time-domain) and linear (frequency-domain) arterial network models.

Main Methods:

  • Utilized distributed arterial network models with identical geometry and boundary conditions.
  • Compared non-linear (time-domain) and linear (frequency-domain) computational models.

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  • Computed pressures at the ascending aorta, brachial, and femoral arteries.

    • Main Results:

    • Differences observed in input impedance modulus (15-20%), systolic pressure (5%), and pulse pressure (10%) between models.
    • The ratio of pulse pressure to aortic pulse pressure differed for the femoral artery (+10% in the linear model).
    • Model disparities were mainly attributed to geometric tapering treatment, not elastic or convective non-linearities.

    Conclusions:

    • The accurate representation of terminal impedance is paramount for peripheral arterial pressure calculations.
    • Discrepancies between linear and non-linear models are comparable in importance to the effect of viscoelasticity.
    • While model type influences results, terminal impedance accuracy is key for peripheral locations.