scholarly journals Abdominal Aortic Aneurysm and the Impact of Infectious Burden

2008 ◽  
Vol 36 (3) ◽  
pp. 292-296 ◽  
Author(s):  
A. Nyberg ◽  
E. Skagius ◽  
E. Englund ◽  
I. Nilsson ◽  
Å. Ljungh ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Abdominal Aortic ◽  
Infectious Burden ◽  
The Impact

scholarly journals Abdominal Aortic Aneurysm and the Impact of Infectious Burden

2008 ◽  
Vol 48 (3) ◽  
pp. 772
Author(s):  
A. Nyberg ◽  
E. Skagius ◽  
E. Englund ◽  
I. Nilsson ◽  
Å. Ljungh ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Abdominal Aortic ◽  
Infectious Burden ◽  
The Impact

Stereoscopically Observed Deformations of a Compliant Abdominal Aortic Aneurysm Model

2011 ◽  
Vol 133 (11) ◽  
Author(s):  
Clark A. Meyer ◽  
Eric Bertrand ◽  
Olivier Boiron ◽  
Valérie Deplano
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Computational Models ◽  
Imaging System ◽  
Strain Differences ◽  
Cyclic Strain ◽  
Experimental Models ◽  
Body Motion ◽  
Abdominal Aortic ◽  
The Impact

A new experimental setup has been implemented to precisely measure the deformations of an entire model abdominal aortic aneurysm (AAA). This setup addresses a gap between the computational and experimental models of AAA that have aimed at improving the limited understanding of aneurysm development and rupture. The experimental validation of the deformations from computational approaches has been limited by a lack of consideration of the large and varied deformations that AAAs undergo in response to physiologic flow and pressure. To address the issue of experimentally validating these calculated deformations, a stereoscopic imaging system utilizing two cameras was constructed to measure model aneurysm displacement in response to pressurization. The three model shapes, consisting of a healthy aorta, an AAA with bifurcation, and an AAA without bifurcation, were also evaluated with computational solid mechanical modeling using finite elements to assess the impact of differences between material properties and for comparison against the experimental inflations. The device demonstrated adequate accuracy (surface points were located to within 0.07 mm) for capturing local variation while allowing the full length of the aneurysm sac to be observed at once. The experimental model AAA demonstrated realistic aneurysm behavior by having cyclic strains consistent with reported clinical observations between pressures 80 and 120 mm Hg. These strains are 1–2%, and the local spatial variations in experimental strain were less than predicted by the computational models. The three different models demonstrated that the asymmetric bifurcation creates displacement differences but not cyclic strain differences within the aneurysm sac. The technique and device captured regional variations of strain that are unobservable with diameter measures alone. It also allowed the calculation of local strain and removed rigid body motion effects on the strain calculation. The results of the computations show that an asymmetric aortic bifurcation created displacement differences but not cyclic strain differences within the aneurysm sac.

The Impact of an Abdominal Aortic Aneurysm on Aortic Wave Reflection

2007 ◽  
Author(s):  
Abigail Swillens ◽  
Lieve Lanoye ◽  
Julie De Backer ◽  
Nikos Stergiopulos ◽  
Frank Vermassen ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Wave Reflection ◽  
Numerical Models ◽  
Aortic Aneurysms ◽  
Western World ◽  
Parameter Study ◽  
Linear Wave ◽  
Abdominal Aortic ◽  
The Impact

The economical growth and increased welfare in the Western world have a reverse side, with an increased death toll due to cardiovascular diseases. Among these, aortic aneurysms (a local dilation) are particularly lethal as they may grow unnoticed until rupture occurs. In this study, we assessed the impact of the presence of an abdominal aortic aneurysm on arterial hemodynamics and wave reflection in particular. Experimental and numerical methods were applied. Linear wave separation was used to quantify the reflections; wave intensity analysis was applied to assess the nature of the reflected waves. In both the experimental and numerical models, negative reflections were found in the upper aorta corresponding to a backward expansion wave caused by the sudden expansion of the aorta. A numerical parameter study demonstrated that larger diameters and more compliant aneurysms generate stronger negative reflections.

The impact of the establishment of a surgical high dependency unit on management of Abdominal Aortic Aneurysm

2006 ◽  
Vol 175 (3) ◽  
pp. 9-12 ◽  
Author(s):  
M. Cleary ◽  
R. A. Cahill ◽  
F. Younis ◽  
S. J. Sheehan ◽  
D. Mehigan ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
High Dependency Unit ◽  
High Dependency ◽  
Abdominal Aortic ◽  
The Impact
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