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Updated: May 9, 2026
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An Ex Vivo Porcine Model for Hydrodynamic Testing of Experimental Aortic Valve Procedures and Novel Medical Devices
Published on: August 25, 2023
Simulations predict improved valve performance without direct leaflet intervention after neonatal truncus arteriosus
Karoline-Marie Bornemann1, Perry S Choi2, Jay Huber3
1Division of Pediatric Cardiology, Department of Pediatrics, Stanford University, Stanford, Calif; Maternal & Child Health Research Institute, Stanford University, Stanford, Calif.
Summary
Truncus arteriosus (TA) repair in neonates with quadricuspid valves improved valve performance by altering hemodynamics. This computational study predicted the elimination of regurgitation post-surgery, matching clinical observations.
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
- Congenital Heart Disease Research
Background:
- Truncus arteriosus (TA) is a severe congenital heart defect.
- Quadricuspid valves in TA patients (25%) are linked to regurgitation and re-operation risk.
- Post-TA repair hemodynamic changes' effect on valve function is not fully understood.
Purpose of the Study:
- To simulate pre- and postoperative hemodynamics in TA patients with quadricuspid valves.
- To investigate valve performance changes without surgical leaflet intervention.
- To predict in silico valve function and identify mechanisms reducing regurgitation.
Main Methods:
- Segmentation of CT images from a neonate with a quadricuspid valve.
- Fluid-structure interaction simulations using patient-specific echocardiogram data and Qp:Qs ratio.
- Modeling of valve dynamics under pre- and postoperative hemodynamic conditions.
Main Results:
- Preoperative simulations confirmed existing mild regurgitation.
- Asymmetric valve dynamics caused poor coaptation and a central regurgitant jet.
- Postoperative simulations showed improved coaptation and eliminated regurgitation, aligning with in vivo data.
Conclusions:
- Computational modeling accurately reproduced in vivo valve performance.
- Altered hemodynamics post-TA repair enhance leaflet coaptation, eliminating regurgitation.
- Favorable fluid-valve interactions suggest improved valve function without leaflet intervention after TA repair.