LVAD Outflow Graft Angle and Thrombosis Risk

Alberto Aliseda, Venkat Keshav Chivukula, Patrick McGah, Anthony R. Prisco, Jennifer A. Beckman, Guilherme J.M. Garcia, Nahush A. Mokadam, Claudius Mahr

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


This study quantifies thrombogenic potential (TP) of a wide range of left ventricular assist device (LVAD) outflow graft anastomosis angles through state-of-the-art techniques: 3D imaged-based patient-specific models created via virtual surgery and unsteady computational fluid dynamics with Lagrangian particle tracking. This study aims at clarifying the influence of a single parameter (outflow graft angle) on the thrombogenesis associated with flow patterns in the aortic root after LVAD implantation. This is an important and poorly-understood aspect of LVAD therapy, because several studies have shown strong inter and intrapatient thrombogenic variability and current LVAD implantation strategies do not incorporate outflow graft angle optimization. Accurate platelet-level investigation, enabled by statistical treatment of outliers in Lagrangian particle tracking, demonstrates a strong influence of outflow graft anastomoses angle on thrombogenicity (platelet residence times and activation state characterized by shear stress accumulation) with significantly reduced TP for acutely-angled anastomosed outflow grafts. The methodology presented in this study provides a device-neutral platform for conducting comprehensive thrombogenicity evaluation of LVAD surgical configurations, empowering optimal patient-focused surgical strategies for long-term treatment and care for advanced heart failure patients.

Original languageEnglish (US)
Pages (from-to)14-23
Number of pages10
JournalASAIO Journal
Issue number1
StatePublished - Jan 1 2017


  • Lagrangian tracking
  • flow patterns
  • left ventricular assist devices
  • outflow graft
  • platelet shear stress history
  • residence time
  • thrombogenic risk

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