Sorry about yout mom's valve problems. I had a biological(cow) valve replacement because I didn't want to do the Coumadin for the rest of my life. How old is your mom? I know my valve might need replacing somewhere down the road,but,hopefully by that time,there will be better ways of doing it. There's research being done now on replacing valves by catheterization. I am amazed at how well I am feeling and how little pain I have from the incision. My best wishes to your mom.