I'm new to the site and having AVR surgery May 30th at Brigham and Women's Hospital in Boston, MA and my surgeon is leaving the valve choice up to me. One minute I'm positive I want a mechanical and the next minute I want a tissue valve. It's the coumadin that is making this so hard for me. I hate taking medication and I also hate the thought of hearing my valve tick all the time. Is it that loud that you can hear it all the time? On the other hand, I don't want another surgery in ten years. It's such a hard choice, thank you to everyone who has posted their thoughts and reasons for selection.