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RESEARCH PAPERS

Influence of Abdominal Aortic Curvature and Resting Versus Exercise Conditions on Velocity Fields in the Normal Abdominal Aortic Bifurcation

[+] Author and Article Information
Erik Morre Pedersen

Department of Thoracic and Cardiovascular Surgery & Institute of Experimental Clinical Research, Skejby Sygehus, Aarhus University Hospital, 8200 Aarhus N, Denmark; The Cardiovascular Research Centre, Aarhus University

Hsing-Wen Sung, Ajit P. Yoganathan

Cardiovascular Fluid Mechanics Laboratory, School of Chemical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0100

J Biomech Eng 116(3), 347-354 (Aug 01, 1994) (8 pages) doi:10.1115/1.2895741 History: Received December 20, 1992; Revised June 24, 1993; Online March 17, 2008

Abstract

Local hemodynamics are considered an important atherogenetic factor in the abdominal aortic bifurcation. This study addresses the quantitative flow fields in a pulsatile flow model of a normal abdominal aortic bifurcation when encountering realistic upstream anatomy, realistic inlet flow conditions and different physiologic flow conditions (rest vs. exercise). Two-dimensional laser Doppler anemometry measurements gave axial as well as radial velocities. The localization and magnitude of peak velocities, retrograde flow and secondary velocity patterns were found to be determined to a great extent by the curvature of the abdominal aorta, the triphasic flow wave form and the inlet velocity profile. Significant changes were also seen when simulating different physiologic flow conditions. Thus retrograde velocities were present at both the flow divider and the lateral vessel wall for the rest condition but not for the exercise flow conditions, and the location of low and retrograde velocities during diastole were as much determined by abdominal aortic curvature as by the bifurcation for nearly all flow conditions and locations. In conclusion, the anatomy and hemodynamics in the abdominal aorta cannot be neglected when studying the hemodynamics in the abdominal aortic bifurcation.

Copyright © 1994 by The American Society of Mechanical Engineers
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