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Influences of Geometric Configurations of Bypass Grafts on Hemodynamics in End-to-Side Anastomosis.

作者信息

Choi Jae-Sung, Hong Sung Chul, Kwon Hyuck Moon, Suh Sang-Ho, Lee Jeong Sang

机构信息

Deptartment of Thoracic and Cardiovascular Surgery, Seoul National University Boramae Hospital, Korea.

出版信息

Korean J Thorac Cardiovasc Surg. 2011 Apr;44(2):89-98. doi: 10.5090/kjtcs.2011.44.2.89. Epub 2011 Apr 14.

DOI:10.5090/kjtcs.2011.44.2.89
PMID:22263134
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3249301/
Abstract

BACKGROUND

Although considerable efforts have been made to improve the graft patency in coronary artery bypass surgery, the role of biomechanical factors remains underrecognized. The aim of this study is to investigate the influences of geometric configurations of the bypass graft on hemodynamic characteristics in relation to anastomosis.

MATERIALS AND METHODS

The Numerical analysis focuses on understanding the flow patterns for different values of inlet and distal diameters and graft angles. The Blood flow field is treated as a two-dimensional incompressible laminar flow. A finite volume method is adopted for discretization of the governing equations. The Carreau model is employed as a constitutive equation for blood. In an attempt to obtain the optimal aorto-coronary bypass conditions, the blood flow characteristics are analyzed using in vitro models of the end-to-side anastomotic angles of 45°, 60° and 90°. To find the optimal graft configurations, the mass flow rates at the outlets of the four models are compared quantitatively.

RESULTS

This study finds that Model 3, whose bypass diameter is the same as the inlet diameter of the stenosed coronary artery, delivers the largest amount of blood and the least pressure drop along the arteries.

CONCLUSION

Biomechanical factors are speculated to contribute to the graft patency in coronary artery bypass grafting.

摘要
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da03/3249301/f7b5cd075392/kjtcs-44-89-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da03/3249301/424b2e82de36/kjtcs-44-89-g004.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da03/3249301/96a533ad8627/kjtcs-44-89-g006.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da03/3249301/f7b5cd075392/kjtcs-44-89-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da03/3249301/bc0b657bf465/kjtcs-44-89-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da03/3249301/f7b5cd075392/kjtcs-44-89-g008.jpg

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Numerical study of hemodynamics and wall mechanics in distal end-to-side anastomoses of bypass grafts.旁路移植远端端侧吻合术中血流动力学和血管壁力学的数值研究
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