Abstract
The Fontan procedure is a common palliative surgery for congenital single ventricle patients. In silico and in vitro patient-specific modeling approaches are widely utilized to investigate potential improvements of Fontan hemodynamics that are related to long-term complications. However, there is a lack of consensus regarding the use of non-Newtonian rheology, warranting a systematic investigation. This study conducted in silico patient-specific modeling for twelve Fontan patients, using a Newtonian and a non-Newtonian model for each patient. Differences were quantified by examining clinically relevant metrics: indexed power loss (iPL), indexed viscous dissipation rate (iVDR), hepatic flow distribution (HFD), and regions of low wall shear stress (AWSS). Four sets of “non-Newtonian importance factors” were calculated to explore their effectiveness in identifying the non-Newtonian effect. No statistical differences were observed in iPL, iVDR, and HFD between the two models at the population-level, but large inter-patient variations exist. Significant differences were detected regarding AWSS, and its correlations with non-Newtonian importance factors were discussed. Additionally, simulations using the non-Newtonian model were computationally faster than those using the Newtonian model. These findings distinguish good importance factors for identifying non-Newtonian rheology and encourage the use of a non-Newtonian model to assess Fontan hemodynamics.
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This study was supported by the National Heart, Lung, and Blood Institute Grants HL67622 and HL098252. The authors acknowledge the use of ANSYS software which was provided through an Academic Partnership between ANSYS, Inc. and the Cardiovascular Fluid Mechanics Lab at the Georgia Institute of Technology.
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Shelly Singh-Gryzbon and Connor Huddleston—not the current affiliation of the authors. All their work involved in this manuscript was performed when the authors were employees of the Georgia Institute of Technology.
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Wei, Z., Singh-Gryzbon, S., Trusty, P.M. et al. Non-Newtonian Effects on Patient-Specific Modeling of Fontan Hemodynamics. Ann Biomed Eng 48, 2204–2217 (2020). https://doi.org/10.1007/s10439-020-02527-8
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DOI: https://doi.org/10.1007/s10439-020-02527-8