Effect of aortic spiral blood flow on wall shear stress in stenosed left main coronary arteries with varying take-off angle, stenosis severity and eccentricity

Abouzar Moshfegh*, Ashkan Javadzadegan, Zhaoqi Zhang, Hamid Hassanzadeh Afrouzi, Mohammad Omidi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

It is well accepted that blood flow in the human aorta is spiral by nature, with beneficial impacts for the cardiovascular system in the form of improved haemodynamics and efficient perfusion. This study investigates the effect of aortic spiral blood flow on wall shear stress (WSS) in computer-generated models of the left main trunk (LMT), also known as left main coronary artery, with varying take-off angle, stenosis severity and eccentricity. The results show that the spirality effect causes a substantial reduction in maximum WSS (WSSmax), average WSS (WSSave) and size of regions with low WSS. The effects of spiral flow on WSSmax become more significant with increasing LMT take-off angle and stenosis eccentricity, and they become less significant with increasing stenosis severity. The aortic spiral blood flow intensity, LMT take-off angle, stenosis severity and eccentricity statistically significantly predict the WSS; however, the strongest predictor of WSS is stenosis severity (F(4, 399) = 3653.85, p < 0.001 for WSSmax and F(4, 399) = 913.46, p < 0.001 for WSSave), followed by LMT take-off angle (F(4, 399) = 582.735, p < 0.001 for WSSmax and F(4, 399) = 163.16, p < 0.001 for WSSave), stenosis eccentricity (F(4, 399) = 230.15, p < 0.001 for WSSmax and F(4, 399) = 52.94, p < 0.001 for WSSave) and blood flow spirality (F(4, 399) = 112.37, p < 0.001 for WSSmax and F(4, 399) = 32.18, p < 0.001 for WSSave). Our findings suggest that naturally or artificially induced spiral flow in the aorta potentially has atheroprotective effects in the LMT.

Original languageEnglish
Pages (from-to)4003-4011
Number of pages9
JournalJournal of Mechanical Science and Technology
Volume32
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • Computational fluid dynamics
  • Left main coronary artery
  • Spiral flow
  • Stenosis severity and eccentricity
  • Take-off angle
  • Wall shear stress

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