Journal Article

007A COMPUTATIONAL FLUID DYNAMICS SIMULATION STUDY OF CORONARY BLOOD FLOW AFFECTED BY GRAFT PLACEMENT

J. Lassaline and B. Moon

in Interactive CardioVascular and Thoracic Surgery

Published on behalf of European Association for Cardio-Thoracic Surgery

Volume 17, issue suppl_2, pages S70-S70
Published in print October 2013 | ISSN: 1569-9293
Published online October 2013 | e-ISSN: 1569-9285 | DOI: http://dx.doi.org/10.1093/icvts/ivt372.7
007A COMPUTATIONAL FLUID DYNAMICS SIMULATION STUDY OF CORONARY BLOOD FLOW AFFECTED BY GRAFT PLACEMENT

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  • Cardiovascular Medicine
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Objectives: To determine the effect of graft placement and orientation on flow rates through a partially obstructed coronary artery.

Methods: A numerical, parametric study of blood flow in the human coronary artery was conducted using computational fluid dynamics simulation. A cylindrical approximation of the coronary artery with varying degrees of stenosis, with and without a bypass graft, was modelled to determine trends in volumetric flow rates. Steady and transient simulations were conducted for geometric variations of percent blockage, length and shape of stenosis, graft position relative to the coronary blockage, and graft orientation. Accurate simulations were performed using a non-Newtonian fluid model and pressure-driven, viscous flow.

Results: Simulations demonstrate, as expected, that total outlet flow rates of grafted arteries are consistently improved for upstream stenosis varying between 0 and 90% blockage. Grafts angled away from perpendicular (towards 45 degrees) provided increased total outflow. However, flow rates in the coronary artery upstream of the graft are substantially reduced in comparison to the non-grafted configuration due to competing flows. For some configurations (less blockage; distance from graft to stenosis less than the length of stenosis), flow rates in the graft are below that of the flow rate through the stenosis. In general, graft angles near 45 degrees increased flow rates upstream of the graft.

Conclusions: Placement and orientation of graft may adversely affect upstream flow, with the degree of effect dependent on geometric factors of downstream position and graft angle.

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Subjects: Cardiovascular Medicine ; Cardiothoracic Surgery

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