Key result
Mean wall shear stress was significantly higher in patients with pulmonary (0.381 vs 0.220) and aortic regurgitation (0.361 vs 0.212) compared to healthy controls (P<0.0001).
Why the study?
Most wall shear stress studies have focused on systolic wall shear stress, leaving altered diastolic hemodynamics in regurgitant semilunar valvular lesions not well characterized.
Does 4D flow MRI reveal elevated diastolic wall shear stress in patients with aortic and pulmonary regurgitation compared to healthy volunteers?
Comparison
Patients with pulmonary regurgitation and aortic regurgitation vs healthy volunteers
Design
Retrospective data analysis
Authors
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Elevated wall shear stress may reflect altered hemodynamics in regurgitation; leaves open 4D flow MRI's role in risk stratification or remodeling prediction.
Observational (n=60)
Does 4D flow MRI reveal elevated diastolic wall shear stress in patients with aortic and pulmonary regurgitation compared to healthy volunteers?
p-value: p=<0.0001
Elevated diastolic wall shear stress is a component of altered flow hemodynamics in aortic and pulmonary regurgitation, which may contribute to vascular remodeling.
Rizk et al. (2019) conducted an observational in Aortic and pulmonary regurgitation (n=60). Pulmonary and aortic regurgitation vs. Healthy volunteers was evaluated on Mean wall shear stress (WSS) along the entire cardiac cycle (p=<0.0001). Mean wall shear stress was significantly higher in patients with pulmonary (0.381 vs 0.220) and aortic regurgitation (0.361 vs 0.212) compared to healthy controls (P<0.0001).
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