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</WRAP> The Sievers Classification of the Bicuspid Aortic Valve

Fig 1. The Sievers classification of the bicuspid aortic valve. The left coronary sinus is on the left (surgeon’s view). The numbers represent the number of specimens from the Sievers original analysis (percent in parenthesis). The main category in this classification depends on the number of raphes. The first subcategory is determined by the spatial position of the cusps (type 0) and the raphes (types 1 and 2). The second subcategory is determined by the valvular function, characterized as follows: I, predominant insufficiency; S, predominant stenosis; B (I þ S), balanced insufficiency and stenosis; No, Normal function.