What is a Bicuspid Aortic Valve? A bicuspid aortic valve is the most common congenital heart defect. 1 in 100 people have a Bicuspid aortic valve and in these patients the bicuspid valve means that they are more prone to developing heart valve narrowing or leaking and this can be both dangerous but also can impact on quality of life. In this video, I discuss everything we know about bicuspid aortic valves and how to treat them