Abstract
Purpose
Realistic fluid-structure interaction (FSI) simulation of the mitral valve opens the way toward planning for surgical repair. In the literature, blood leakage is identified by measuring the flow rate, but detailed information about closure efficiency is missing. We present in this paper an FSI model that improves the detection of blood leakage by building a map of contact.
Methods
Our model is based on the immersed boundary method that captures a map of contact and perfect closure of the mitral valve, without the presence of orifice holes, which often appear with existing methods. We also identified important factors influencing convergence issues.
Results
The method is demonstrated in three typical clinical situations: mitral valve with leakage, bulging, and healthy. In addition to the classical ways of evaluating MV closure, such as stress distribution and flow rate, the contact map provides easy detection of leakage with identification of the sources of leakage and a quality assessment of the closure.
Conclusions
Our method significantly improves the quality of the simulation and allows the identification of regurgitation as well as a spatial evaluation of the quality of valve closure. Comparably fast simulation, ability to simulate large deformation, and capturing detailed contact are the main aspects of the study.
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Notes
Slow-motion video of mitral valve closure: https://hal.archives-ouvertes.fr/hal-03419776.
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Khaledian, N., Villard, PF. & Berger, MO. Capturing contact in mitral valve dynamic closure with fluid-structure interaction simulation. Int J CARS 17, 1391–1398 (2022). https://doi.org/10.1007/s11548-022-02674-4
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DOI: https://doi.org/10.1007/s11548-022-02674-4