Fluid- and Biomechanical Analysis of Ascending Thoracic Aorta Aneurysm with Concomitant Aortic Insufficiency

F. Condemi*, S. Campisi, M. Viallon, T. Troalen, G. Xuexin, A. J. Barker, M. Markl, P. Croisille, O. Trabelsi, C. Cavinato, A. Duprey, S. Avril

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

We present a comprehensive and original framework for the biomechanical analysis of patients affected by ascending thoracic aorta aneurysm and aortic insufficiency. Our aim is to obtain crucial indications about the role played by deranged hemodynamics on the ATAAs risk of rupture. Computational fluid dynamics analysis was performed using patient-specific geometries and boundary conditions derived from 4D MRI. Blood flow helicity and wall shear stress descriptors were assessed. A bulge inflation test was carried out in vitro on the 4 ATAAs after surgical repair. The healthy volunteers showed no eccentric blood flow, a mean TAWSS of 1.5 ± 0.3 Pa and mean OSI of 0.325 ± 0.025. In 3 aneurismal patients, jet flow impingement on the aortic wall resulted in large TAWSS values and low OSI which were amplified by the AI degree. However, the tissue strength did not appear to be significantly reduced. The fourth patient, which showed the lowest TAWSS due to the absence of jet flow, had the smallest strength in vitro. Interestingly this patient presented a bovine arch abnormality. Jet flow impingement with high WSS values is frequent in ATAAs and our methodology seems to be appropriate for determining whether it may increase the risk of rupture or not.

Original languageEnglish (US)
Pages (from-to)2921-2932
Number of pages12
JournalAnnals of Biomedical Engineering
Volume45
Issue number12
DOIs
StatePublished - Dec 1 2017

Keywords

  • 4D MRI
  • Computational fluid dynamics
  • Mechanical inflation tests
  • Wall shear stress
  • Wall strength

ASJC Scopus subject areas

  • Biomedical Engineering

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    Condemi, F., Campisi, S., Viallon, M., Troalen, T., Xuexin, G., Barker, A. J., Markl, M., Croisille, P., Trabelsi, O., Cavinato, C., Duprey, A., & Avril, S. (2017). Fluid- and Biomechanical Analysis of Ascending Thoracic Aorta Aneurysm with Concomitant Aortic Insufficiency. Annals of Biomedical Engineering, 45(12), 2921-2932. https://doi.org/10.1007/s10439-017-1913-6