Numerical Simulation of The Impact of Chorda Tendinea Rapture on The Mitral Valve Leaflets Stress By Finite Element Method
Hasan Abedini 1 and Adel Johari Moghadam 2*1Department of Biomedical Engineering , Amir Kabir University , Tehran , Iran 2Department of Cardiology , AJA University of Medical Sciences , Tehran , Iran Corresponding Authors Email : adeljoharim@yahoo.com
Abstract: Numerical modeling of the lack of blood supply in mitral valve regurgitation and its related surgeries are very attractive, because it enables us to examine whether the surgery would improve the blood flow to reduce the tension in tissues. This is crucial, because the negative effects of increasing tension can only be determined over time. However, a finite element method is valuable. This requires accurate heart geometries, heart tissue parameters, a powerful solver and etc. In the present study, with the help of simulation, the function of mitral valve was compared in both modes of normal and valve prolapsed, through which useful results were obtained. Among the models, hyper-elastic Mooney-Rivlin model is used for the first time. The boundary conditions of model are also much nearby to the reality of ventricular function in imposing pressure on the valves. Unlike previous models, in which the prolapse was never been significant, the function of valve is carefully studied and compared in this model. The findings, at the end of the simulation, suggest that the prolapse caused by the rupture of chorda tendinea can be problematic to the valve function. Although the number of chorda tendinea and their properties can be very different in each individual, what has been suggested as a possibility in the results of this simulation is that in the rupture of chorda tendinea, since the imposed tension on the other chorda tendinea and also the tensions created on the leaflets increase, the modification of chorda tendinea as quickly as possible prevents the rupture of other cords. Therefore, the replacement of artificial valve which is very costly and risky may be avoided with a timely surgery.
Keywords: Mitral valve leaflets; Chorda tendinea; finite element method; mitral valve prolapse Back to TOC