Kim, I had a mechanical valve implanted in 2002 because of a BAV, I developed pannus(scar tissue) around the valve and had to have it replaced in 2008. I wanted another mechanical in the off chance it wouldn't happen again, however, the surgeon had to use a tissue valve because the mechanical would not seat properly. I am 2 years post-op and the peak gradient across the valve is now 49, it is progressing faster than it did last time. I know folks have had multiple surgeries, just don't know of any that have had the exact same valve replaced so many times in such a short span of time. I am contacting my surgeon today to see if I will be a candidate again. SURE hope SO. Not ready to check out yet at the age of 49.