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Impedance matching at arterial bifurcations
1Department of Medical Biophysics, University of Western Ontario, London, Canada.
Journal of Biomechanics
|January 1, 1993
Summary
Minimizing arterial pulse wave reflections requires continuous matching of impedance through geometric and elastic property changes at bifurcations. This study presents a model showing elastic property changes are crucial for minimizing reflections, especially in larger bifurcations.
Area of Science:
- Biomedical Engineering
- Cardiovascular Physiology
- Fluid Dynamics
Background:
- Pulse wave reflections occur at arterial bifurcations due to impedance mismatch.
- Continuous matching of geometric and elastic properties is needed to minimize these reflections.
Purpose of the Study:
- To present a theoretical model for minimizing pulse wave reflection through arterial bifurcations.
- To investigate the role of changing geometric and elastic properties in reducing reflections.
Main Methods:
- Developed a theoretical model accounting for linear area changes and asymmetry in bifurcations.
- Characterized changes in elastic properties from parent to daughter arteries.
- Assessed the effect of branch angle on daughter vessel mechanical properties.
Main Results:
- Reflections cannot be minimized without altering elastic properties through bifurcations.
- Young's moduli of daughter vessels may decrease if area ratio (beta) < 1.0 and Womersley parameter (alpha) < 5.
- Larger area ratios correlate with greater increases in daughter vessel Young's moduli.
Conclusions:
- Elastic property changes are essential for minimizing pulse wave reflections at bifurcations.
- The model predicts specific changes in Young's moduli based on area ratio and Womersley parameter.
- Findings align with observed increases in peripheral vessel Young's moduli.