Numerical Modeling of Blood Flow in a Healthy Aorta and Aorta with Stent

Belaghit, Abdel Hakem; Aour, Benaoumeur; Larabi, Mekki; Mebarki, Salah

doi:10.4028/www.scientific.net/jbbbe.39.13

Cited by 3 publications

(3 citation statements)

References 22 publications

(18 reference statements)

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“…In fact, there were no obvious gradients in high TAWSS at the proximal anastomosis among the four bypass modes, and it is worth noting that high TAWSS may be caused by the reverse blood supply of the stent graft being greater than that of the left carotid artery 37 . Moreover, high TAWSS at the proximal anastomosis may facilitate long‐term patency of the bypass graft 38 …”

Section: Discussionmentioning

confidence: 89%

“…37 Moreover, high TAWSS at the proximal anastomosis may facilitate long-term patency of the bypass graft. 38 In summary, this study used CFD simulations to investigate blood flow characteristics before and after LSA revascularization in occluded LSA, healthy LSA, and four LSA bypass modes. LCA to LSA bypass mode was shown to not only effectively reduce left subclavian steal syndrome, but also provide stable and sufficient blood flow to the distal LSA.…”

Section: Discussionmentioning

confidence: 99%

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Effects of different bypass surgeries on LSA revascularization in patients with left subclavian occlusion

Zeng

Wang

et al. 2022

Numer Methods Biomed Eng

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Introduction: Left subclavian artery (LSA) bypass surgery is mainly carried out for patients with severe left subclavian occlusion. This article aimed to evaluate the hemodynamic effects of different surgical bypass modes on LSA revascularization.Methods: Three-dimensional models of the aorta were reconstructed from CTA images of a patient with LSA occlusion, a patient with type B aortic dissection with LSA coverage during thoracic endovascular aortic repair, and a healthy 74-year-old man, resulting in six modes for each person: healthy LSA mode, LSA occlusion mode and four bypass modes. Hemodynamic parameters, including flow field, flow distribution, pressure gradient, and wall shear stress, were calculated using computational fluid dynamics. Results: After LSA bypass surgery, distal LSA blood flow resulting from left common carotid artery (LCCA) to distal LSA bypass was 100% of that in the healthy mode, while the other modes yielded flows at least 91%. Moreover, reversed flow only completely disappeared with LCCA to distal LSA bypass, whereas reverse flow was observed in the other three modes in early systole. Conclusion:Left common carotid artery to distal LSA bypass can effectively reduce reverse blood flow in the left vertebral artery, and it is a feasible, effective, and safe option for LSA revascularization in patients with left subclavian occlusion.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Effects of different bypass surgeries on LSA revascularization in patients with left subclavian occlusion

Zeng

Wang

et al. 2022

Numer Methods Biomed Eng

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“…It was shown that combination of both the techniques resulted in accurate estimation of the wall shear stresses. Belaghit et al [16] performed computations on a realistic healthy aortic arch and that with a stent. They found that the stent limits the dilatation of the descending aorta.…”

Section: Introductionmentioning

confidence: 99%

Pulsatile Blood Flow Simulation for Subject-Specific Geometry of a Human Aortic Arch

Shariff

Sivapragasam

Prabhu

et al. 2023

IJMEBAC

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Pulsatile blood flow in a subject-specific human aortic arch and its major branches is studied computationally for a peak Reynolds number of 1553 and a Womersley number of 22.74. The aortic geometry is constructed from the CT-scan images of a subject. The aorta has out-of-plane curvature and significant area variation along the flow direction. A physiologically representative pulsatile velocity waveform is applied as boundary condition at the inlet of the aorta. The primary velocity profiles are skewed towards the inner wall of the ascending aorta during the entire cardiac cycle. In the decelerating phase, reverse flow is noted along the inner wall and the magnitude of maximum velocity is about 50 % of the peak flow condition. Flow separation is observed in the inner wall of the ascending aorta during the decelerating and reverse flow phases of the cardiac cycle. In the accelerating phase, however, flow separation does not occur. The major observation of the present work is the existence of complex and asymmetrical vortical flow structures which are not observed either in simple curved pipes or in idealized aortic arch computational studies. The relative strength of the secondary flow with respect to the primary flow is quantified by means of Relative Secondary Kinetic Energy whose highest value is evaluated to be 1.202 occurring near the entrance of the right carotid artery during the maximum reverse flow condition. High values of wall shear stress is observed at distal of the left and right subclavian arteries, the bifurcation of brachiocephalic artery between right subclavian artery and right carotid artery, and proximal inner wall of descending aorta during the cardiac cycle. The wall shear stress at the bifurcations of the branches are low and oscillatory and generally correlates with the preferential sites for atherosclerosis. The flow structures on the aorta wall are explicitly highlighted by the limiting streamlines. The application of limiting streamlines to clearly elucidate the complex on-wall flow structures is one of the key contributions of the present study. During the decelerating and reverse flow phases several critical points are observed on the aortic wall. These complex flow structures vanish during the accelerating phase. The observations made in the present study will be helpful in creating accurate and clinically useful computational models.

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Computational analysis of designing an improved coronary stents of biodegradable Poly-lactic Acid (PLA)

Lounansa

Ameddah

Mazouz

et al. 2022

Australian Journal of Mechanical Engineering

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Numerical Modeling of Blood Flow in a Healthy Aorta and Aorta with Stent

Cited by 3 publications

References 22 publications

Effects of different bypass surgeries on LSA revascularization in patients with left subclavian occlusion

Effects of different bypass surgeries on LSA revascularization in patients with left subclavian occlusion

Pulsatile Blood Flow Simulation for Subject-Specific Geometry of a Human Aortic Arch

Computational analysis of designing an improved coronary stents of biodegradable Poly-lactic Acid (PLA)

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