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Aortic valve가 coronary artery의 혈류와 FFR에 미치는 영향에 대한 수치해석적 연구
김근홍(Geun-Hong Kim),권순성(Soon-Sung Kwon),김국태(Gook Tae Kim),황사빈(Sa Bin Hwang),심은보(Eun Bo Shim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In coronary artery disease, aortic valve may have a critical effect for stenosed coronary flow. Vortex formed by the aortic valve in sinus valsalva increases coronary flow. Therefore, we have built up coronary artery model containing aortic valve. For this purpose, coronary 3D model with the aortic valve was made based on anatomical shape. Then, we developed lumped parameter model of coronary circulation. Blood is assumed incompressible and Newtonian fluid. Finite element analysis was performed for Navier-Stokes equation. Then we compared the hemodynamic charateristics of the models with and without aortic valve.
Kyung Eun Lee(이경은),Gook Tae Kim(김국태),Ah-Jin Ryu(류아진),Eun Bo Shim(심은보) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.1
Swirl flow is often found in proximal coronary arteries, because the aortic valves can induce swirl flows in the coronary artery due to vortex formation. In addition, the curvature and tortuosity of arterial configurations can also produce swirl flows. The present study was performed to investigate fractional flow reserve alterations in a post-stenotic distal part due to the presence of pre-stenotic swirl flow by computational fluid dynamics analysis for virtual stenotic models by quantifying fractional flow reserve(FFR). Simplified stenotic coronary models were divided into those with and without pre-stenotic swirl flow. Various degrees of virtual stenosis were grouped into three grades: mild, moderate, and severe, with degree of stenosis of 0 ~ 40%, 50 ~ 60%, and 70 ~ 90%, respectively. In this study, three-dimensional computational hemodynamic simulations were performed under hyperemic conditions in virtual stenotic coronary models by coupling with a zero-dimensional lumped parameter model. The results showed that the influence of pre-stenotic swirl inflow is dominant on FFR alteration in mild stenosis, whereas stenosis is dominant on FFR alteration in moderate/severe stenosis. The decrease in FFR caused by swirl flow is more significant in mild stenosis than moderate/severe stenosis. Biomechanical modeling is useful for clinicians to provide insight for medical intervention strategies. This hemodynamic-based parameter study could play a critical role in the development of a non-invasive imaging-based strategy-support system for percutaneous transluminal angioplasty in cases of mild/moderate stenosis.