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Cardiovascular Engineering and Technology

, Volume 5, Issue 1, pp 110–118 | Cite as

Correlation of Hemodynamic Parameters to Endothelial Cell Proliferation in an End to Side Anastomosis

  • Leonard D. Browne
  • Siobhan O’Callaghan
  • David A. Hoey
  • Philip Griffin
  • Timothy M. McGloughlin
  • Michael T. WalshEmail author
Article

Abstract

A strong correlation between the localization of atherosclerotic lesions with abnormal wall shear stress (WSS) has long been recognized at the distal anastomosis of a peripheral bypass where disturbed flow occurs. Identification of a WSS variable that significantly contributes to disease formation at this site has been elusive to date, as endothelial cell (EC) response to the abnormal hemodynamics at this anastomotic junction has yet to be quantitatively characterized. In vitro experiments were performed exposing human aortic ECs to pulsatile flow variables appropriate to a distal bypass graft junction using a novel in vitro device. Computational fluid dynamics was employed to detail the hemodynamic variables of this flow chamber. These variables were then correlated to EC proliferation which was used as an indicator of intimal hyperplasia (IH) development. Under pulsatile flow, maximum absolute temporal WSS gradient was found to be the parameter that most significantly correlated to EC proliferation (p = 0.0001, r = 0.8947). This metric can be utilized as an indicator to detect arterial segments prone to the initiation and localization of IH, it may also be used to help optimize the surgical construction of coronary artery bypass, peripheral bypass and arteriovenous anastomotic junctions to improve patient outcomes.

Keywords

Pulsatile flow Shear stress Intimal hyperplasia Temporal shear stress gradient Bypass graft 

Notes

Acknowledgments

The author would like to acknowledge Enterprise Ireland, The Irish Research Council for Science Engineering and Technology (IRCSET) and the Nerem Laboratory at the Institute for Bioengineering and Bioscience at Georgia Institute of Technology.

Conflict of Interest

All authors declare that they have no conflict of interest.

Ethical Standards

No human studies were carried out by the authors for this article. No animal studies were carried out by the authors for this article.

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Copyright information

© Biomedical Engineering Society 2013

Authors and Affiliations

  • Leonard D. Browne
    • 1
  • Siobhan O’Callaghan
    • 1
  • David A. Hoey
    • 1
  • Philip Griffin
    • 1
  • Timothy M. McGloughlin
    • 1
  • Michael T. Walsh
    • 1
    Email author
  1. 1.Department of Mechanical, Aeronautical & Biomedical Engineering, Centre for Applied Biomedical Engineering Research (CABER), Materials and Surface Science InstituteUniversity of LimerickLimerickIreland

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