Effects of Major Endoleaks on a Stented Abdominal Aortic AneurysmSource: Journal of Biomechanical Engineering:;2006:;volume( 128 ):;issue: 001::page 59DOI: 10.1115/1.2132376Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Insertion of a stent-graft into an aneurysm, especially abdominal aortic aneurysms (AAAs), is a very attractive surgical intervention; however, it is not without major postoperative complications, such as endoleaks. An endoleak is the transient accumulation of blood in the AAA cavity, which is formed by the stent-graft and AAA walls. Of the four blood pathways, a type I endoleak constitutes the major one. Thus, focusing on both proximal and distal type I endoleaks, i.e., the minute net influx of blood past the attachment points of a stent-graft into the AAA cavity, the transient three-dimensional interactions between luminal blood flow, stent-graft wall, leakage flow, and AAA wall are computationally simulated. For different type I endoleak scenarios and inlet pressure wave forms, the impact of type I endoleaks on cavity pressure, wall stress, and stent-graft migration force is analyzed. The results indicate that both proximal type I-a and distal type I-b endoleaks may cause cavity pressures close to a patient’s systemic pressure; however, with reduced pulsatility. As a result, the AAA-wall stress is elevated up to the level of a nonstented AAA and, hence, such endoleaks render the implant useless in protecting the AAA from possible rupture. Interestingly enough, the net downward force acting on the implant is significantly reduced; thus, in the presence of endoleaks, the risk of stent-graft migration may be mitigated.
keyword(s): Force , Pressure , Stress , Blood , Cavities , Rupture , Aneurysms , Blood flow , Waves , stents AND Leakage ,
|
Collections
Show full item record
contributor author | Z. Li | |
contributor author | C. Kleinstreuer | |
date accessioned | 2017-05-09T00:19:02Z | |
date available | 2017-05-09T00:19:02Z | |
date copyright | February, 2006 | |
date issued | 2006 | |
identifier issn | 0148-0731 | |
identifier other | JBENDY-26587#59_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/133237 | |
description abstract | Insertion of a stent-graft into an aneurysm, especially abdominal aortic aneurysms (AAAs), is a very attractive surgical intervention; however, it is not without major postoperative complications, such as endoleaks. An endoleak is the transient accumulation of blood in the AAA cavity, which is formed by the stent-graft and AAA walls. Of the four blood pathways, a type I endoleak constitutes the major one. Thus, focusing on both proximal and distal type I endoleaks, i.e., the minute net influx of blood past the attachment points of a stent-graft into the AAA cavity, the transient three-dimensional interactions between luminal blood flow, stent-graft wall, leakage flow, and AAA wall are computationally simulated. For different type I endoleak scenarios and inlet pressure wave forms, the impact of type I endoleaks on cavity pressure, wall stress, and stent-graft migration force is analyzed. The results indicate that both proximal type I-a and distal type I-b endoleaks may cause cavity pressures close to a patient’s systemic pressure; however, with reduced pulsatility. As a result, the AAA-wall stress is elevated up to the level of a nonstented AAA and, hence, such endoleaks render the implant useless in protecting the AAA from possible rupture. Interestingly enough, the net downward force acting on the implant is significantly reduced; thus, in the presence of endoleaks, the risk of stent-graft migration may be mitigated. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Effects of Major Endoleaks on a Stented Abdominal Aortic Aneurysm | |
type | Journal Paper | |
journal volume | 128 | |
journal issue | 1 | |
journal title | Journal of Biomechanical Engineering | |
identifier doi | 10.1115/1.2132376 | |
journal fristpage | 59 | |
journal lastpage | 68 | |
identifier eissn | 1528-8951 | |
keywords | Force | |
keywords | Pressure | |
keywords | Stress | |
keywords | Blood | |
keywords | Cavities | |
keywords | Rupture | |
keywords | Aneurysms | |
keywords | Blood flow | |
keywords | Waves | |
keywords | stents AND Leakage | |
tree | Journal of Biomechanical Engineering:;2006:;volume( 128 ):;issue: 001 | |
contenttype | Fulltext |