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Abstract #2932

Wall shear stress analysis after anatomically pre-shaped 90°- and straight ascending aortic grafts: A comparison between prostheses and age-matched volunteers using 4D Flow MRI

Malte Maria Sieren1, Jennifer Schlüter1, Thekla Helene Oechtering1, Michael Scharfschwerdt2, Christian Auer2, Markus Hüllebrand3, Hans-Hinrich Sievers2, Jörg Barkhausen1, and Alex Frydrychowicz1

1Department of Radiology and Nuclear Medicine, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany, 2Department of Cardiac and Cardiothoracic Vascular Surgery, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany, 3Fraunhofer MEVIS, Bremen, Germany

Patients with aortic prostheses following aneurysm/dissection repair demonstrate an increased number of secondary aortic flow patterns. These may result in elevated forces acting on the vessel wall and thus preterm degenerative changes. Anatomically pre-shaped 90°-prostheses promise more physiological flow patterns and wall shear stress (WSS). The aim of this study was to compare WSS of patients with straight prostheses (n=8), 90°-prostheses (n=9) and healthy volunteers (n=12) based on 4D Flow MRI. Results revealed a tendency towards decreased WSS in regions distal to the 90°-prostheses, whereas in comparison to healthy volunteers, WSS values in patients with both prostheses were significantly increased.

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