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@article{Kandail:2015:10.1177/1526602815587261,
author = {Kandail, H and Hamady, M and Xu, XY},
doi = {10.1177/1526602815587261},
journal = {Journal of Endovascular Therapy},
pages = {578--590},
title = {Comparison of blood flow in branched and fenestrated stent-grafts for endovascular repair of abdominal aortic aneurysms.},
url = {http://dx.doi.org/10.1177/1526602815587261},
volume = {22},
year = {2015}
}
TY - JOUR
AB - PURPOSE: To report a computational study assessing the hemodynamic outcomes of branched stent-grafts (BSGs) for different anatomic variations. METHODS: Idealized models of BSGs and fenestrated stent-grafts (FSGs) were constructed with different visceral takeoff angles (ToA) and lateral aortic neck angles. ToA was defined as the angle between the centerlines of the main stent-graft and side branch, with 90° representing normal alignment, and 30° and 120° representing angulated side branches. Computational simulations were performed by solving the conservation equations governing the blood flow under physiologically realistic conditions. RESULTS: The largest renal flow recirculation zones (FRZs) were observed in FSGs at a ToA of 30°, and the smallest FRZ was also found in FSGs (at a ToA of 120°). For straight-neck stent-grafts with a ToA of 90°, mean flow in each renal artery was 0.54, 0.46, and 0.62 L/min in antegrade BSGs, retrograde BSGs, and FSGs, respectively. For angulated stent-grafts, the corresponding values were 0.53, 0.48, and 0.63 L/min. All straight-neck stent-grafts experienced equal cycle-averaged displacement forces of 1.25, 1.69, and 1.95 N at ToAs of 30°, 90°, and 120°, respectively. Angulated main stent-grafts experienced an equal cycle-averaged displacement force of 3.6 N. CONCLUSION: The blood flow rate in renal arteries depends on the configuration of the stent-graft, with an FSG giving maximum renal flow and a retrograde BSG resulting in minimum renal flow. Nevertheless, the difference was small, up to 0.09 L/min. Displacement forces exerted on stent-grafts are very sensitive to lateral neck angle but not on the configuration of the stent-graft.
AU - Kandail,H
AU - Hamady,M
AU - Xu,XY
DO - 10.1177/1526602815587261
EP - 590
PY - 2015///
SN - 1545-1550
SP - 578
TI - Comparison of blood flow in branched and fenestrated stent-grafts for endovascular repair of abdominal aortic aneurysms.
T2 - Journal of Endovascular Therapy
UR - http://dx.doi.org/10.1177/1526602815587261
UR - http://hdl.handle.net/10044/1/23832
VL - 22
ER -
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