Patient-specific CT-based 3D passive FSI model for left ventricle in hypertrophic obstructive cardiomyopathy

Area of Science:

• Cardiovascular Medicine
• Biomedical Engineering
• Computational Fluid Dynamics

Background:

• Hypertrophic cardiomyopathy affects 1 in 500 adults, often causing left ventricular outflow tract obstruction.
• Systolic anterior motion (SAM) of the mitral valve is a key suspected contributor to this obstruction.
• Understanding mitral valve dynamics is crucial for managing hypertrophic obstructive cardiomyopathy.

Purpose of the Study:

• To develop a patient-specific 3D fluid-structure interaction model of the left ventricle.
• To analyze mitral valve motion and its role in left ventricular outflow tract obstruction.
• To provide a foundation for optimizing surgical interventions in hypertrophic obstructive cardiomyopathy.

Main Methods:

• A 3D patient-specific fluid-structure interaction model was created using computed tomography (CT) scan data.
• Analysis included displacement, structural stress, pressure, flow velocity, and shear stress within the left ventricle and mitral valve.
• Quantification of mitral valve behavior, including angles of attack, during simulated cardiac cycles.

Main Results:

• Maximum mitral valve shear stress reached 9.68 [Formula: see text].
• Peak pressure on the posterior mitral leaflet exceeded that on the anterior leaflet, reaching 93.5 mm Hg pre-SAM.
• High angles of attack (54.3 ± 22.4°) were observed, indicating significant valve motion.

Conclusions:

• The study provides a detailed biomechanical characterization of mitral valve motion in hypertrophic obstructive cardiomyopathy.
• The developed modeling methodology can elucidate the mechanisms of systolic anterior motion (SAM).
• This approach holds potential for improving surgical planning and patient outcomes by comparing pre- and post-operative models.