Timing and size of flow impingement in a giant intracranial aneurysm at the internal carotid artery

Liang-Der Jou, Michel E. Mawad

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Flow impingement is regarded as a key factor for aneurysm formation and rupture. Wall shear stress (WSS) is often used to evaluate flow impingement even though WSS and impinging force are in two different directions; therefore, this raises an important question of whether using WSS for evaluation of flow impingement size is appropriate. Flow impinging behavior in a patient-specific model of a giant aneurysm (GA) at the internal carotid artery (ICA) was analyzed by computational fluid dynamics simulations. An Impingement Index (IMI) was used to evaluate the timing and size of flow impingement. In theory, the IMI is related to the WSS gradient, which is known to affect vascular biology of endothelial cells. Effect of non-Newtonian fluid, aneurysm size, and heart rate were also studied. Maximum WSS is found to be proportional to the IMI, but the area of high wall shear is not proportional to the size of impingement. A faster heart rate or larger aneurysm does not produce a larger impinging site, and the Newtonian assumption overestimates the size of impingement. Flow impingement at the dome occurs approximately 0.11 s after the peak of flow waveform is attained. This time delay also increases with aneurysm size and varies with heart rate and waveform.

Original languageEnglish (US)
Pages (from-to)891-899
Number of pages9
JournalMedical and Biological Engineering and Computing
Volume49
Issue number8
DOIs
StatePublished - Aug 1 2011

Keywords

  • Aneurysm
  • Blood flow
  • Intracranial aneurysm

ASJC Scopus subject areas

  • Biomedical Engineering
  • Computer Science Applications

Fingerprint

Dive into the research topics of 'Timing and size of flow impingement in a giant intracranial aneurysm at the internal carotid artery'. Together they form a unique fingerprint.

Cite this