Including aortic valve morphology in computational fluid dynamics simulations: Initial findings and application to aortic coarctation

David C. Wendell, Margaret M. Samyn, Joseph R. Cava, Laura M. Ellwein, Mary M. Krolikowski, Kimberly L. Gandy, Andrew N Pelech, Shawn C. Shadden, John F. LaDisa

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Computational fluid dynamics (CFD) simulations quantifying thoracic aortic flow patterns have not included disturbances from the aortic valve (AoV). 80% of patients with aortic coarctation (CoA) have a bicuspid aortic valve (BAV) which may cause adverse flow patterns contributing to morbidity. Our objectives were to develop a method to account for the AoV in CFD simulations, and quantify its impact on local hemodynamics. The method developed facilitates segmentation of the AoV, spatiotemporal interpolation of segments, and anatomic positioning of segments at the CFD model inlet. The AoV was included in CFD model examples of a normal (tricuspid AoV) and a post-surgical CoA patient (BAV). Velocity, turbulent kinetic energy (TKE), time-averaged wall shear stress (TAWSS), and oscillatory shear index (OSI) results were compared to equivalent simulations using a plug inlet profile. The plug inlet greatly underestimated TKE for both examples. TAWSS differences extended throughout the thoracic aorta for the CoA BAV, but were limited to the arch for the normal example. OSI differences existed mainly in the ascending aorta for both cases. The impact of AoV can now be included with CFD simulations to identify regions of deleterious hemodynamics thereby advancing simulations of the thoracic aorta one step closer to reality.

Original languageEnglish (US)
Pages (from-to)723-735
Number of pages13
JournalMedical Engineering and Physics
Volume35
Issue number6
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Bicuspid aortic valve
  • Congenital heart disease
  • Hemodynamics
  • Kinetic energy
  • Magnetic resonance imaging (MRI)
  • Phase-contrast MRI
  • Shear stress
  • Turbulence

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biophysics

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  • Cite this

    Wendell, D. C., Samyn, M. M., Cava, J. R., Ellwein, L. M., Krolikowski, M. M., Gandy, K. L., Pelech, A. N., Shadden, S. C., & LaDisa, J. F. (2013). Including aortic valve morphology in computational fluid dynamics simulations: Initial findings and application to aortic coarctation. Medical Engineering and Physics, 35(6), 723-735. https://doi.org/10.1016/j.medengphy.2012.07.015