Key result
Flat BAVs are linked to lower orifice contraction and ~40% higher pressure gradients versus doming valves.
Why the study?
The Gorlin equation assumes a constant contraction coefficient of 1 in aortic stenosis, but whether 3D valve geometry alters the ratio of effective to anatomic orifice area was unknown.
Does three-dimensional valve shape affect the coefficient of orifice contraction and pressure gradient in aortic stenosis?
Comparison
Different 3D valve shapes from doming to flat
Design
In vitro flow model and clinical observational study
Authors
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Bicuspid valve shape may affect AS severity assessment; modeling extends geometric insights but leaves clinical impact open.
Observational (n=35)
Does three-dimensional valve shape affect the coefficient of orifice contraction and pressure gradient in aortic stenosis?
Absolute Event Rate: 0.73% vs 0.94%
p-value: p=<0.0001
Three-dimensional valve shape is an important determinant of pressure loss in aortic stenosis, with flatter valves resulting in smaller effective areas and higher pressure gradients.
Gilon et al. (2002) conducted an observational in Aortic stenosis (n=35). Flat bicuspid valve shape vs. Doming bicuspid valve shape was evaluated on Coefficient of orifice contraction (Cc) (p=<0.0001). Flat bicuspid aortic valves resulted in a significantly lower coefficient of orifice contraction compared to doming valves (0.73 vs. 0.94, p<0.0001) and 40% higher pressure gradients.
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