Journal
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
Volume 288, Issue 5, Pages H2465-H2475Publisher
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpheart.01107.2004
Keywords
computational fluid dynamics; restenosis; computational modeling; computed tomography; image reconstruction; wall shear stress
Funding
- NHLBI NIH HHS [HL-03690, HL-63705, HL-54820] Funding Source: Medline
- NIGMS NIH HHS [GM-08377] Funding Source: Medline
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Restenosis resulting from neointimal hyperplasia ( NH) limits the effectiveness of intravascular stents. Rates of restenosis vary with stent geometry, but whether stents affect spatial and temporal distributions of wall shear stress ( WSS) in vivo is unknown. We tested the hypothesis that alterations in spatial WSS after stent implantation predict sites of NH in rabbit iliac arteries. Antegrade iliac artery stent implantation was performed under angiography, and blood flow was measured before casting 14 or 21 days after implantation. Iliac artery blood flow domains were obtained from three- dimensional microfocal X- ray computed tomography imaging and reconstruction of the arterial casts. Indexes of WSS were determined using three- dimensional computational fluid dynamics. Vascular histology was unchanged proximal and distal to the stent. Time- dependent NH was localized within the stented region and was greatest in regions exposed to low WSS and acute elevations in spatial WSS gradients. The lowest values of WSS spatially localized to the stented area of a theoretical artery progressively increased after 14 and 21 days as NH occurred within these regions. This NH abolished spatial disparity in distributions of WSS. The results suggest that stents may introduce spatial alterations in WSS that modulate NH in vivo.
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