A direct correlation between commissural orientation and annular shape in bicuspid aortic valves: a new anatomical and computed tomography classification

OBJECTIVES The shape of the aortic annulus is still under debate. Recent findings suggest a possible gradual spectrum of circularity from tricuspid aortic valves (TAVs), to type 1 bicuspid aortic valves (BAVs) to type 0 BAVs. BAVs have been recently classified in a symmetrical (type A), asymmetrical (type B) or very asymmetrical (type C) phenotype according to the commissural orientation (CO) (160°–180°, 140°–159° and 120°–139°, respectively)....