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Published on: January 16, 2026
Computational analysis of pediatric ventricular assist device implantation to decrease cerebral particulate
ThuyTien Nguyen1, I Ricardo Argueta-Morales2, Stephen Guimond1
1a Department of Mechanical and Aerospace Engineering, College of Engineering and Computer Science, University of Central Florida , Orlando , FL , USA.
Insights
Computational fluid dynamics (CFD) analysis of ventricular assist device (VAD) implantation geometry can reduce pediatric stroke risk. Optimizing VAD outflow-graft angles minimizes cerebral embolization, improving patient outcomes.
Area of Science:
- Biomedical Engineering
- Pediatric Cardiology
- Medical Device Technology
Background:
- Stroke is a major complication following pediatric ventricular assist device (VAD) implantation, with high mortality.
- Current VAD technology and anticoagulation methods are insufficient to prevent stroke in children.
- Computational methods offer a potential avenue to reduce the risk of cerebral embolization.
Purpose of the Study:
- To investigate the impact of VAD implantation geometry on cerebral embolization risk using computational fluid dynamics (CFD).
- To determine optimal VAD outflow-graft configurations for minimizing stroke risk in pediatric patients.
- To assess the influence of patient-specific anatomy on VAD-related stroke risk.
Main Methods:
- Generation of 3D aortic arch models for infant and child patients.
- Simulation of blood flow patterns using CFD with a VAD outflow-graft.
- Calculation of particle tracks originating from the VAD to assess cerebral vessel entry percentages for various implantation angles and particle sizes.
Main Results:
- For infant models, cerebral embolization ranged from 15% (90° anastomosis) to 31% (30° anastomosis).
- For child models, cerebral embolization ranged from 9% (30° anastomosis) to 15% (60° anastomosis).
- VAD implantation geometry significantly influences the risk of stroke, with patient-specific anatomy also playing a role.
Conclusions:
- CFD analysis demonstrates that VAD implantation geometry is a critical factor in pediatric stroke risk.
- Optimizing VAD implantation angles can significantly reduce the potential for cerebral embolization.
- CFD provides a valuable tool for personalizing VAD implantation strategies to minimize stroke risk in pediatric patients.
Abstract:
Stroke is the most devastating complication after ventricular assist device (VAD) implantation with a 19% incidence and 65% mortality in the pediatric population. Current pediatric VAD technology and anticoagulation strategies alone are suboptimal. VAD implantation assisted by computational methods (CFD) may contribute reducing the risk of cerebral embolization. Representative three-dimensional aortic arch models of an infant and a child were generated. An 8 mm VAD outflow-graft (VAD-OG) anastomosed to the aorta was rendered and CFD was applied to study blood flow patterns. Particle tracks, originating in the VAD, were computed with a Lagrangian phase model and the percentage of particles entering the cerebral vessels was calculated. Eight implantation configurations (infant = 5 and child = 3) and 5 particle sizes (0.5, 1, 2, 3, and 4 mm) were considered. For the infant model, percentage of particles entering the cerebral vessels ranged from 15% for a VAD-OG anastomosed at 90° to the aorta, to 31% for 30° VAD-OG anastomosis (overall percentages: X(2) = 10,852, p < 0.0001). For the child model, cerebral embolization ranged from 9% for the 30° VAD-OG anastomosis to 15% for the 60° anastomosis (overall percentages: χ(2) = 10,323, p < 0.0001). Using detailed CFD calculations, we demonstrate that the risk of stroke depends significantly on the VAD implantation geometry. In turn, the risk probably depends on patient-specific anatomy. CFD can be used to optimize VAD implantation geometry to minimize stroke risk.
