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Visualization of vortex flow and shear stress in the aortic root during left ventricular assist device support  Shohei Yoshida, MD, Satsuki Fukushima,

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Presentation on theme: "Visualization of vortex flow and shear stress in the aortic root during left ventricular assist device support  Shohei Yoshida, MD, Satsuki Fukushima,"— Presentation transcript:

1 Visualization of vortex flow and shear stress in the aortic root during left ventricular assist device support  Shohei Yoshida, MD, Satsuki Fukushima, MD, PhD, Shigeru Miyagawa, MD, PhD, Koichi Toda, MD, PhD, Yoshiki Sawa, MD, PhD  The Journal of Thoracic and Cardiovascular Surgery  Volume 154, Issue 3, Pages e1 (September 2017) DOI: /j.jtcvs Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

2 Figure 1 (Left) Flow velocity vector on color Doppler. Red represents flow toward the top; blue, flow toward the bottom. The yellow arrow represents the flow velocity vector, with the direction of the arrow equal to the flow direction and the size of arrow reflecting flow velocity. (Right) The fine green lines indicate the flow streamline. Multiple colors around the aortic root represent the wall shear stress: red, high; blue, low. A, Systolic phase. B-E, Early and mid-diastolic phases. F, Late diastolic phase. The Journal of Thoracic and Cardiovascular Surgery  , e1DOI: ( /j.jtcvs ) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

3 Figure 2 A, Graph representing the time-dependent changes during a cardiac cycle in the size (blue line) and vorticity (red line) of the vortex in the ascending aorta in patients with ischemic cardiomyopathy on LVAD support. Both variables approached the peak just after the systolic phase and settled in the late diastolic phase. B, Graph representing the time-dependent changes in mean wall shear stress on the aortic valve leaflets during a cardiac cycle in patients with ischemic cardiomyopathy on LVAD support. The variable approached the peak just after the systolic phase and settled in the late diastolic phase. The Journal of Thoracic and Cardiovascular Surgery  , e1DOI: ( /j.jtcvs ) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

4 Figure E1 A, LVAD outflow graft anastomosed to the anterior wall of the ascending aorta. B, Postoperative anatomy, including the outflow graft, the ascending aorta, and the aortic valve. The Journal of Thoracic and Cardiovascular Surgery  , e1DOI: ( /j.jtcvs ) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

5 Retrograde blood flow from the LVAD Increases the wall shear stress on aortic valve leaflets.
The Journal of Thoracic and Cardiovascular Surgery  , e1DOI: ( /j.jtcvs ) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

6 Video 1 Echocardiography and vector flow mapping analysis in the aortic root during 3 cardiac cycles. First, color Doppler echo. Second, color Doppler and flow velocity vector analysis. Third, wall shear stress and streamline analysis. Video available at: The Journal of Thoracic and Cardiovascular Surgery  , e1DOI: ( /j.jtcvs ) Copyright © 2017 The American Association for Thoracic Surgery Terms and Conditions

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