Central regions of the abdominal aortic aneurysm sac exhibited significantly different ex vivo and in vivo structural and biomechanical properties compared to adjacent regions.
Observational
Regional characterization of abdominal aortic aneurysms reveals significant structural and biomechanical heterogeneity, highlighting the potential value of non-invasive regional assessment to improve clinical outcomes.
The current clinical guidelines for the management of aortic abdominal aneurysms (AAAs) overlook the structural and mechanical heterogeneity of the aortic tissue and its role in the regional weakening that drives disease progression. This study is a comprehensive investigation of the structural and biomechanical heterogeneity of AAA tissue along the length and circumference of the aorta, by means of regional ex vivo and in vivo properties. Biaxial testing and histological analysis were performed on ex vivo human aortic specimens systematically collected during open repair surgery. Wall-shear stress and three-dimensional principal strain analysis were performed to allow for in vivo regional characterization of individual aortas. A marked effect of position along the aortic length was observed in both ex vivo and in vivo properties, with the central regions corresponding to the aneurysmal sac being significantly different from the adjacent regions. The heterogeneity along the circumference of the aorta was reflected in the ex vivo biaxial response at low strains and histological properties. Present findings uniquely show the importance of regional characterization for aortic assessment and the need to correlate heterogeneity at the tissue level with non-invasive measurements aimed at improving clinical outcomes.
Forneris et al. (Tue,) conducted a observational in Abdominal Aortic Aneurysm (AAA). Position along the aortic length and circumference vs. Adjacent aortic regions was evaluated on Structural and biomechanical heterogeneity (ex vivo biaxial response, histological properties, wall-shear stress, and principal strain). Central regions of the abdominal aortic aneurysm sac exhibited significantly different ex vivo and in vivo structural and biomechanical properties compared to adjacent regions.