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

Authors
 Jae-Sung Choi  ;  Sung Chul Hong  ;  Hyuck Moon Kwon  ;  Sang-Ho Suh  ;  Jeong Sang Lee 
Citation
 Korean Journal of Thoracic and Cardiovascular Surgery, Vol.44(2) : 89-98, 2011 
Journal Title
Korean Journal of Thoracic and Cardiovascular Surgery
ISSN
 2233-601X 
Issue Date
2011
Keywords
Anastomosis ; surgery ; Computer simulation ; Coronary artery bypass ; Hemodynamics
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 45degrees, 60degrees and 90degrees. 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.
Files in This Item:
T201104991.pdf Download
DOI
10.5090/kjtcs.2011.44.2.89
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Hyuck Moon(권혁문) ORCID logo https://orcid.org/0000-0001-9901-5015
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/94869
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