Advanced biomechanical assessment of mitral valve prosthesis using fluid-structure interaction modeling

Area of Science:

• Cardiovascular Engineering
• Biomedical Simulation
• Prosthetic Valve Research

Background:

• Mitral regurgitation (MR) is a common valvular heart disease requiring prosthetic valve replacement.
• Predicting biomechanical performance of mechanical mitral valve prostheses is challenging due to complex blood-structure interactions.
• Accurate assessment of prosthetic valve function is crucial for patient outcomes.

Purpose of the Study:

• To develop a patient-informed fluid-structure interaction (FSI) model for evaluating mechanical mitral valve prosthesis performance.
• To assess the biomechanical and hemodynamic performance of a mechanical mitral valve using patient-specific data.
• To compare the performance of a prosthetic valve with a healthy left ventricle (LV) model.

Main Methods:

• Developed and validated a patient-informed FSI model of the left ventricle and mitral valve prosthesis using echocardiographic data and numerical simulations.
• Analyzed a St. Jude mechanical mitral valve in a 46-year-old male patient.
• Quantified hemodynamic and mechanical parameters including flow velocity, shear stress, pressure gradient, and von Mises stress.

Main Results:

• The prosthetic valve restored global flow direction, stroke volume, and ventricular wall displacement.
• The prosthetic valve produced higher inflow velocities (up to 6.5 m/s) and prolonged shear stress (0.08–0.18 s), indicating potential hemolysis risk.
• Pressure gradients peaked at ~13 mmHg, with localized stress near the prosthesis.

Conclusions:

• Patient-informed FSI modeling provides accurate, noninvasive assessment of post-operative hemodynamics and mechanical performance.
• This approach identifies risks such as elevated shear stress and potential hemolysis.
• The FSI model supports optimized prosthetic design and personalized surgical planning.