The blood flow channel index as novel predictor of abdominal aortic aneurysm impending rupture based on the intraluminal thrombus angio-CT study

2015 ◽  
Vol 84 (4) ◽  
pp. 662-667 ◽  
Author(s):  
Ireneusz Wiernicki ◽  
Pawel Szumilowicz ◽  
Arkadiusz Kazimierczak ◽  
Aleksander Falkowski ◽  
Donald Rutkowski ◽  
...  
Keyword(s):  
Blood Flow ◽  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Flow Channel ◽  
Intraluminal Thrombus ◽  
Impending Rupture ◽  
Abdominal Aortic ◽  
Angio Ct

scholarly journals Alterations of blood flow pattern after triple stent endovascular treatment of saccular abdominal aortic aneurysm: a porcine model.

2016 ◽  
Vol 43 (3) ◽  
pp. 154-159
Author(s):  
JAHIR RICHARD DE OLIVEIRA ◽  
MAURÍCIO DE AMORIM AQUINO ◽  
SVETLANA BARROS ◽  
GUILHERME BENJAMIN BRANDÃO PITTA ◽  
ADAMASTOR HUMBERTO PEREIRA
Keyword(s):  
Blood Flow ◽  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Endovascular Treatment ◽  
Flow Pattern ◽  
Blood Flow Pattern ◽  
Large White ◽  
Abdominal Aortic ◽  
Before And After ◽  
Infrarenal Abdominal Aorta

ABSTRACT Objective: to determine the blood flow pattern changes after endovascular treatment of saccular abdominal aortic aneurysm with triple stent. Methods: we conducted a hemodynamic study of seven Landrace and Large White pigs with saccular aneurysms of the infrarenal abdominal aorta artificially produced according to the technique described. The animals were subjected to triple stenting for endovascular aneurysm. We evaluated the pattern of blood flow by duplex scan before and after stent implantation. We used the non-paired Mann-Whitney test for statistical analysis. Results: there was a significant decrease in the average systolic velocity, from 127.4cm/s in the pre-stent period to 69.81cm/s in the post-stent phase. There was also change in the flow pattern from turbulent in the aneurysmal sac to laminate intra-stent. Conclusion: there were changes in the blood flow pattern of saccular abdominal aortic aneurysm after endovascular treatment with triple stent.

Multimodality imaging assessment of the deleterious role of the intraluminal thrombus on the growth of abdominal aortic aneurysm in a rat model

2015 ◽  
Vol 26 (7) ◽  
pp. 2378-2386 ◽  
Author(s):  
Alain Nchimi ◽  
Audrey Courtois ◽  
Mounia El Hachemi ◽  
Ziad Touat ◽  
Pierre Drion ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Rat Model ◽  
Multimodality Imaging ◽  
Intraluminal Thrombus ◽  
Abdominal Aortic

Intraluminal thrombus and risk of rupture in patient specific abdominal aortic aneurysm – FSI modelling

2009 ◽  
Vol 12 (1) ◽  
pp. 73-81 ◽  
Author(s):  
Danny Bluestein ◽  
Kris Dumont ◽  
Matthieu De Beule ◽  
John Ricotta ◽  
Paul Impellizzeri ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Patient Specific ◽  
Intraluminal Thrombus ◽  
Abdominal Aortic ◽  
Risk Of Rupture

Investigating the Effect of Intraluminal Thrombus in Abdominal Aortic Aneurysm by Computational and Experimental Methods

2009 ◽  
Author(s):  
Florentina Ene ◽  
Carine Gachon ◽  
Patrick Delassus ◽  
Liam Morris
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
High Risk ◽  
Aortic Aneurysm ◽  
Abdominal Aorta ◽  
Experimental Methods ◽  
Infrarenal Aorta ◽  
Intraluminal Thrombus ◽  
Abdominal Aortic ◽  
Risk Of Rupture

Abdominal aortic aneurysm (AAA) represents an abnormal dilatation and weakening of the abdominal aorta with high risk of rupture. Most aneurysms of the infrarenal aorta possess an asymmetrical fusiform morphology.

Computational Modeling of the Effects of Transient Blood Flow Characteristics and Wall Thickness on the Rupture of Abdominal Aortic Aneurysm

2014 ◽  
Author(s):  
Pinaki Pal
Keyword(s):  
Blood Flow ◽  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Wall Thickness ◽  
Flow Model ◽  
Wall Stress ◽  
Flow Transition ◽  
Abdominal Aortic ◽  
Sst Model ◽  
Peak Wall Stress

Precise estimation of wall stress distribution within an abdominal aortic aneurysm (AAA) is clinically useful for prediction of its rupture. In this paper a computational fluid dynamic model incorporating two-way coupled fluid-structure interaction is employed to investigate the role of laminar-turbulent flow transition and wall thickness in altering the distribution and magnitude of wall stress in an AAA. Blood flow in axially symmetric aneurysm models governed by a compliant wall mechanics was simulated. Menter’s hybrid k-epsilon/k-omega shear stress transport (SST) model with a correlation-based transition model was used to capture laminar-turbulent transition in the blood flow. Realistic physiological transient boundary conditions were prescribed. The numerical model was validated against experimental data available from the literature. Fluid flow analysis showed the formation of recirculating vortices at the proximal end of the aneurysm after the peak systole which then, moved towards the distal end of the aneurysm along with the bulk flow and were dissipated eventually due to viscous effects. These vortices interacted with the aortic wall and led to local pressure rise. Von Mises stress distribution on the aneurysm wall and location of its peak value were computed and compared with those of a separate numerical simulation performed using a laminar viscous flow model. The predicted peak wall stress was found to be significantly higher for the SST model as compared to the laminar flow model. The location of maximum stress shifted more towards the posterior end of the aneurysm when laminar-turbulent flow transition was considered. In addition, a small reduction of 0.4 mm in wall thickness resulted in the elevation of peak wall stress by a factor of 1.4. The present study showed that capturing flow transition in an AAA is essential to accurate prediction of its rupture. The proposed numerical model provides a robust computational framework to gain more insight into AAA biomechanics and to accurately estimate wall stresses in realistic aneurysm configurations.

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