Related Experiment Video
Updated: Mar 9, 2026
Establishment and Evaluation of a Porcine Vein Graft Disease Model
Published on: July 25, 2022
LVAD Outflow Graft Angle and Thrombosis Risk
Alberto Aliseda1, Venkat Keshav Chivukula, Patrick Mcgah
1From the *Department of Mechanical Engineering, University of Washington, Seattle, Washington; †Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee, Wisconsin; ‡Division of Cardiology, University of Washington, Seattle, Washington; and §Division of Cardiothoracic Surgery, University of Washington, Seattle, Washington.
Optimizing left ventricular assist device (LVAD) outflow graft angles can reduce thrombotic potential. Acute angles significantly decrease thrombogenicity, improving patient outcomes in heart failure therapy.
Area of Science:
- Biomedical Engineering
- Cardiovascular Research
- Medical Device Technology
Background:
- Left ventricular assist device (LVAD) therapy is crucial for advanced heart failure.
- Thrombotic complications remain a significant challenge, showing high variability.
- Current implantation strategies lack outflow graft angle optimization.
Purpose of the Study:
- To quantify the thrombogenic potential (TP) associated with various LVAD outflow graft anastomosis angles.
- To clarify the influence of outflow graft angle on thrombogenesis in the aortic root post-LVAD implantation.
- To investigate the relationship between flow patterns, platelet behavior, and thrombogenicity.
Main Methods:
- Utilized patient-specific, 3D imaging-based models created via virtual surgery.
- Employed unsteady computational fluid dynamics (CFD) with Lagrangian particle tracking.
- Performed statistical analysis of particle tracking data to assess platelet residence times and shear stress accumulation.
Main Results:
- Demonstrated a strong correlation between outflow graft anastomosis angle and thrombogenicity.
- Identified significantly reduced thrombogenic potential in acutely-angled outflow grafts.
- Quantified platelet residence times and shear stress accumulation influenced by graft angle.
Conclusions:
- Outflow graft angle is a critical parameter influencing LVAD-associated thrombogenesis.
- Acutely angled grafts show reduced thrombotic risk, suggesting a new optimization strategy.
- The presented methodology offers a device-neutral platform for evaluating LVAD surgical configurations and improving patient care.
