If you are asymtomatic, I would have echo's every 6 mos. and keep on top of it. Shortness of breath is a big sign that your root (aneurysm) is getting bigger. A dilated aortic root of more than 3.5 is considered an aneurysm. Also, blood thinners is not the correct term...anticoagulant (blood cells are prevented from sticking together) is better. Coumadin can be a real pain. But I was told if at my younger age if I had a porcine or bovine valve put in, i would probably not last even 10 years and that a mechanical valve made more sense in my case. Hope you find your answers.