Left Ventricular Assist Device Inflow Cannula Angle and Thrombosis Risk

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Computational Fluid Dynamics

Background:

• Increasing prevalence of heart failure necessitates advanced treatments like left ventricular assist devices (LVADs).
• Anecdotal evidence suggests potential links between LVAD inflow cannula malalignment and thrombosis risk.
• Lack of mechanistic and statistical quantification of this relationship necessitates further investigation.

Purpose of the Study:

• To investigate the mechanistic impact of surgical inflow cannula angulation on left ventricular assist device (LVAD) thrombogenicity.
• To quantitatively assess the relationship between inflow cannula angulation and thrombosis risk using computational modeling.
• To determine the optimal angulation range for LVAD inflow cannulas to improve patient outcomes.

Main Methods:

• Utilized unsteady computational fluid dynamics (CFD) and computational modeling with virtual surgery to simulate left ventricular blood flow.
• Employed a holistic approach evaluating thrombogenicity using platelet-based (Lagrangian) and flow-based (Eulerian) metrics.
• Analyzed 5 different inflow cannula angulations to assess hemodynamic and platelet mechanical environments.

Main Results:

• Left ventricular inflow cannula angulation significantly influences intraventricular hemodynamics.
• Certain angulations elevate thrombogenic potential, indicated by platelet behavior and potential activation.
• Optimal inflow cannula angulation is determined to be within 0±7° of the left ventricular apical axis.

Conclusions:

• Inflow cannula angulation exceeding 7° from the apical axis results in significantly unfavorable hemodynamics.
• Computational hemodynamic simulations provide a powerful method for optimizing LVAD implantation strategies.
• Optimizing LVAD implantation through precise cannula angulation holds long-term potential for improving patient outcomes.