Sievers Classification (Bicuspid Aortic Valve)
Sievers classification (Sievers 2007) of a bicuspid aortic valve (types 0/1/2), by the number of raphes - used in echocardiography, CT, and aortic-valve repair / TAVR planning.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Sievers type
- Type 1 - one raphe (most common)
Result: Sievers type 1: one raphe, formed by the fusion of two underdeveloped cusps; the most common type.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Type 0
- No raphe; two (usually symmetrical) leaflets and two commissures.
- Type 1
- One raphe (the most common); sub-typed by the fused sinuses (L-R, R-N, or N-L).
- Type 2
- Two raphes; the least common type.
What you enter
- Sievers type
How this is calculated
Sievers HH, Schmidtke C. A classification system for the bicuspid aortic valve from 304 surgical specimens. J Thorac Cardiovasc Surg. 2007;133(5):1226-1233. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.