Abstract #2717

Lower Wall Shear Stress and Abnormal Hemodynamics within the Saccular Aneurysm in Contrast to Fusiform Aneurysm in the Abdominal Aorta.

Masataka Sugiyama¹, Yasuo Takehara², Hatsuko Nasu¹, Shuhei Yamashita¹, Mika Kamiya¹, Nobuko Yoshizawa¹, Yuki Hirai¹, Takasuke Ushio¹, Naoko Hyodo¹, Yohei Ito¹, Naoki Oishi², Marcus Alley³, Tetsuya Wakayama⁴, and Harumi Sakahara¹

¹Radiology, Hamamatsu University School of Medicine, Hamamatsu, Japan, ²Radiology, Hamamatsu University Hospital, Hamamatsu, Japan, ³Department of Radiology, Stanford University School of Medicine, Stanford, CA, United States, ⁴Applied Science Laboratory Asia Pacific, GE Healthcare Japan, Hino, Japan

3D cine PC MRI (4D-flow) study of abdominal aorta was conducted to measure wall shear stress (WSS) and to characterize aortic blood flow dynamics within saccular and fusiform abdominal aortic aneurysm and non-dilated aorta. Peak systolic WSS was significantly lower within saccular aneurysm, and stream line analysis depicted separated vortex flow within the saccular aneurysm. The abnormal vortex flow and consequent low WSS of saccular aneurysmal wall may be reflecting the continuing risk of atherogenic changes of the saccular aneurysm in contrast to fusiform aneurysm.

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