Key result
Patient-specific wall thickness modelling demonstrated that assuming a uniform wall thickness can underestimate peak wall stress by up to 55% or overestimate it by up to 40% in abdominal aortic aneurysms.
Why the study?
Does patient-specific wall thickness modeling alter predicted peak wall stress and rupture risk in abdominal aortic aneurysms compared to uniform wall thickness modeling?
Observational (n=8)
Does patient-specific wall thickness modeling alter predicted peak wall stress and rupture risk in abdominal aortic aneurysms compared to uniform wall thickness modeling?
Absolute Event Rate: 0.6761% vs 0.4905%
Incorporating patient-specific wall thickness in AAA computational models significantly alters peak wall stress and rupture risk predictions compared to standard uniform wall assumptions.
Uniform assumptions may misestimate AAA rupture risk; hypothesis-generating and requires prospective validation before clinical adoption.
Rupture of abdominal aortic aneurysms (AAAs) is linked to aneurysm morphology. This study investigates the influence of patient-specific (PS) AAA wall thickness on predicted clinical outcomes. Eight patients under surveillance for AAAs were selected from the MA(3)RS clinical trial based on the complete absence of intraluminal thrombus. Two finite element (FE) models per patient were constructed; the first incorporated variable wall thickness from CT (PS_wall), and the second employed a 1.9mm uniform wall (Uni_wall). Mean PS wall thickness across all patients was 1.77±0.42mm. Peak wall stress (PWS) for PS_wall and Uni_wall models was 0.6761±0.3406N/mm(2) and 0.4905±0.0850N/mm(2), respectively. In 4 out of 8 patients the Uni_wall underestimated stress by as much as 55%; in the remaining cases it overestimated stress by up to 40%. Rupture risk more than doubled in 3 out of 8 patients when PS_wall was considered. Wall thickness influenced the location and magnitude of PWS as well as its correlation with curvature. Furthermore, the volume of the AAA under elevated stress increased significantly in AAAs with higher rupture risk indices. This highlights the sensitivity of standard rupture risk markers to the specific wall thickness strategy employed.
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Conlisk et al. (2016) conducted an observational in Abdominal aortic aneurysms (n=8). Patient-specific wall thickness modelling vs. Uniform 1.9mm wall thickness modelling was evaluated on Peak wall stress (PWS). Patient-specific wall thickness modelling demonstrated that assuming a uniform wall thickness can underestimate peak wall stress by up to 55% or overestimate it by up to 40% in abdominal aortic aneurysms.
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