Abstract
BackgroundThe changes of hemodynamics caused by the implantation of multilayer stent (MS) have significant effects for aneurysm sac.MethodsComparisons of 3D numerical models with/without a MS in an abdominal aortic aneurysm with a 90° branch vessel were numerically studied from the viewpoint of hemodynamics.ResultsThe results showed that: (1) The flow fields and Wall Shear Stress (WSS) are changed dramatically after MS implantation. The velocity of the blood flow in aneurysm sac decreases significantly and the regions of low-WSS increase. These help thrombus formation; (2) The pressure in aneurysm slightly decreases and keeps close to the normal level of blood pressure, however the risk of aneurysm enlargement or even rupture still exists; (3) The flux and the velocity in branch artery are reduced by about half after MS implantation. Due to the implantation of MS, the changes in the flow field causes the decrease of pressure/WSS in aneurysm sac and the blood flow in branch vessel.ConclusionsThe implantation of MS into abdominal artery results in more low-WSS regions inside aneurysm which induces thrombus formation. The pressure is reduced slightly means the risk of aneurysm rupture exists.
Highlights
The changes of hemodynamics caused by the implantation of multilayer stent (MS) have significant effects for aneurysm sac
Claus et al [8] reported that ten complex iliac artery aneurysm (IAA) were treated in 8 patients between October 2010 and August 2012, the results showed stent placement was technically successful and the mortality was 0%
Alberto et al [11]. implanted 5 MSs in 5 patients to treat hepatic artery aneurysms, 2 years follow-up showed technical successes; Morris et al [12] treated visceral artery aneurysms (VAAs) in 5 patients with MSs and technical successes were achieved for all patients; Bouillot et al [13] compared the process of intracranial aneurysms (IAs) treated with flow diverter stents through both PIV and CFD, the results showed there was a good PIV–CFD agreement
Summary
The changes of hemodynamics caused by the implantation of multilayer stent (MS) have significant effects for aneurysm sac. The velocity of the blood flow in aneurysm sac decreases significantly and the regions of low-WSS increase. These help thrombus formation; (2) The pressure in aneurysm slightly decreases and keeps close to the normal level of blood pressure, the risk of aneurysm enlargement or even rupture still exists; (3) The flux and the velocity in branch artery are reduced by about half after MS implantation. Due to the implantation of MS, the changes in the flow field causes the decrease of pressure/WSS in aneurysm sac and the blood flow in branch vessel. The renal artery aneurysm was first treatment with MS happened in 2008 in France [4], where a 78-year-old hypertensive man with complications was incidentally found to have a large saccular aneurysm in his renal artery involving the inferior renal artery, MS was implanted on the aneurysm neck covering the inferior renal artery, the
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