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Effect of LVAD outflow conduit insertion angle on flow through the native aorta
K D May-Newman1, B K Hillen, C S Sironda
1Department of Mechanical Engineering, San Diego State University, 5500 Campanile Drive, Mail Code 1323, San Diego, CA 92182-1323, USA.
Journal of Medical Engineering & Technology
|June 19, 2004
Summary
Optimizing left ventricular assist device (LVAD) surgery, this study used CFD simulations to show shallower aortic outflow conduit angles reduce harmful flow patterns. This improves blood flow dynamics in the aorta.
Area of Science:
- Cardiovascular Engineering
- Medical Device Design
- Computational Fluid Dynamics
Background:
- Surgical anastomosis of the aortic outflow conduit (AOC) from a continuous flow left ventricular assist device (LVAD) impacts aortic blood flow.
- Understanding these flow patterns is crucial for optimizing LVAD integration and patient outcomes.
Purpose of the Study:
- To evaluate how different surgical anastomosis configurations of the AOC affect aortic flow fields.
- To investigate the influence of AOC insertion angle on flow dynamics during both series and parallel LVAD support modes.
Main Methods:
- Computational fluid dynamics (CFD) models were created to simulate AOC junctions with varying angles (30-90 degrees).
- Velocity fields were computed for both series (LVAD only) and parallel (LVAD + native heart) flow conditions across a range of cardiac outputs.
Main Results:
- Aortic outflow conduit angle significantly influences flow patterns in the aorta.
- Higher angles (up to 90 degrees) induce flow recirculation and high shear stress zones on the aortic wall.
- Lower angles (e.g., 30 degrees) minimize these adverse flow phenomena, particularly during series flow, which exhibited the highest velocities and shear stress.
Conclusions:
- Shallower AOC insertion angles into the proximal aorta result in fewer secondary flow patterns.
- Surgical planning should consider AOC angulation to optimize hemodynamics and potentially reduce complications associated with LVAD support.