Hi all, I have been on a self imposed hiatus, so much going on so little time...anyway, as I posted before, my mom has now been diagnosed with an aortic aneurysm of 4.7cms and I was throwing this out to the folks who mostly have experience with or know, for a 74 y/o, I'm thinking and she is too, that she doesnt need a mechanical AV and there were mentions on the site of bovine vs porcine? Can anyone elaborate more?