DEAR MAYO CLINIC: I consider myself to be in good health. I work out several times a week, but recently I began experiencing episodes of shortness of breath after going up and down the stairs in my home. After running on the treadmill a few weeks ago, I got dizzy and fainted. I went to my doctor who told me that I have a bicuspid aortic valve. Can you share more about what this is and if it can be fixed? Also, I have children. Are they at risk for this condition?