Sievers’ classification system for BAVas viewed from the
surgeon’s side with the left coronary artery at left. The number of
specimens is given, and the percentage is shown in parentheses. The
blackened lines represent raphe. The main category is based
on the number of raphes, the first subcategory is based on spatial position, and
the second subcategory reflects valve function. Ap,
Anterior-posterior; B, balanced valvular lesion;
I, insufficiency; L, left coronary sinus;
lat, lateral; N, noncoronary sinus;
No, normal function; R, right coronary
sinus; S, stenosis. Used with permission from Sievers and
Schmidtke.14