Key result
Breathhold time-resolved three-directional MR velocity mapping showed that laminar flow in the ascending aorta after aortic valve-sparing surgery was similar to healthy volunteers (P=0.210).
Why the study?
Does breathhold time-resolved three-directional MR velocity mapping demonstrate restoration of normal flow patterns in patients after aortic valve-sparing surgery compared to healthy volunteers and patients with ascending aortic aneurysm?
Cross-Sectional (n=35)
Does breathhold time-resolved three-directional MR velocity mapping demonstrate restoration of normal flow patterns in patients after aortic valve-sparing surgery compared to healthy volunteers and patients with ascending aortic aneurysm?
p-value: p=0.210
Breathhold time-resolved three-directional MR velocity mapping demonstrates that normal laminar flow in the ascending aorta and vortical flow in the sinuses of Valsalva can be restored after aortic valve-sparing surgery.
May support restored laminar flow after valve-sparing surgery; leaves open outcome benefits and need for prospective validation.
PURPOSE: To evaluate the utility of breathhold time-resolved three-directional MR velocity mapping for quantifying the restoration of normal flow patterns in patients after aortic valve-sparing surgery. MATERIALS AND METHODS: Breathhold time-resolved three-directional MR velocity mapping was performed on 13 patients with aortic valve-sparing surgery. Ten healthy volunteers and 12 patients with ascending aortic aneurysm underwent the same MR examination for comparison. Aortic laminar flow, turbulent flow, and the presence of vortical flow in the sinuses of Valsalva were semiquantitatively assessed and statistically compared between the three groups of subjects. RESULTS: The average score of laminar flow in the ascending aorta for patients with surgery was not significantly different from that of volunteers (P=0.210), but was significantly greater than that of patients with aneurysm (P<0.01). The average score of turbulent flow in patients with surgery was significantly smaller than that of patients with aneurysm (P<0.01). The presence of systolic vortical flow in the sinuses of Valsalva for patients with surgery was not significantly different from that of healthy volunteers (P=0.405) and patients with aneurysm (P=0.238). CONCLUSION: Breathhold time-resolved three-directional MR velocity mapping allows for quantifying flow patterns in the aortic root and ascending aorta. Normal laminar flow in the ascending aorta and vortical flow in the sinuses of Valsalva can be restored in patients after aortic valve-sparing surgery.
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Liu et al. (2009) conducted a cross-sectional in Aortic valve-sparing surgery (n=35). Aortic valve-sparing surgery vs. Healthy volunteers and patients with ascending aortic aneurysm was evaluated on Aortic laminar flow, turbulent flow, and vortical flow in the sinuses of Valsalva assessed via MR velocity mapping (p=0.210). Breathhold time-resolved three-directional MR velocity mapping showed that laminar flow in the ascending aorta after aortic valve-sparing surgery was similar to healthy volunteers (P=0.210).
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