4D flow MRI was performed on a 70-years-old woman with severe aortic stenosis before and after transcatheter aortic valve implantation (TAVI).
They evaluated the flow pattern, and the wall shear stress of the ascending aorta caused by severe aortic stenosis. 4D flow MRI demonstrated vortex flow and increased wall shear stress of the ascending aorta before TAVI. These findings improved after TAVI. This paper is the first case report to observe abnormal flow effects on the wall of ascending aorta in aorti

Hirokazu Komoriyama, Satonori Tsuneta, Noriko Oyama-Manabe, Kiwamu Kamiya, and Toshiyuki Nagai, "Four-dimensional flow magnetic resonance imaging visualizes significant changes in flow pattern and wall shear stress in the ascending aorta after transcatheter aortic valve implantation in a patient with severe aortic stenosis", European Heart Journal - Cardiovascular Imaging, 21 (2020) 21.