Fluid-structure interaction modeling of calcific aortic valve disease using patient-specific three-dimensional...

Area of Science:

• Cardiovascular Research
• Biomedical Engineering
• Medical Imaging

Background:

• Calcific aortic valve disease (CAVD) involves aortic valve cusp thickening and calcification, leading to stenosis.
• Fluid flow shear stress is crucial in CAVD initiation and progression.
• Previous fluid-structure interaction (FSI) models simplified 3D calcifications into 2D representations.

Purpose of the Study:

• To investigate the hemodynamic effects of 3D patient-specific calcification masses in CAVD.
• To analyze how realistic 3D calcifications influence fluid shear stress compared to 2D models.
• To explore the impact of shear stress on calcification growth using novel modeling techniques.

Main Methods:

• Developed patient-specific 3D calcification masses from CT scans.
• Employed a novel reverse calcification technique (RCT) to model calcification growth stages.
• Utilized fluid-structure interaction (FSI) models to simulate hemodynamics with 3D calcifications.

Main Results:

• 3D calcification deposits resulted in significantly higher fluid shear stresses on the aortic side of the cusps.
• A unique distribution of fluid shear stress was observed with 3D calcifications.
• The simulated flow dynamics did not appear to influence the calcification geometry during the growth phase.

Conclusions:

• Incorporating 3D calcification geometry in FSI models provides a more accurate understanding of CAVD hemodynamics.
• Elevated and uniquely distributed shear stresses may play a role in regulating CAVD progression.
• Further research is needed to fully elucidate the interplay between hemodynamics and calcification development in CAVD.