yes indeed katm, there are successs and failure stories with all valves.
A couple of things to keep in mind. The tissue valves may not last as long as the mechanical valve, and statistically that is the case...but I am not worried about cutting myself with warfarin, I can stop that bleeding eventually with good direct pressure and elevation usually...I am more worried about falling off a ladder or having a car accident when on warfarin...because you can't usually control bleeding into your brain. If, for some reason yoru warfarin levels go a bit high, and you have a bad whack to the head, you can have a haemorrhagic event into the skull. I was warfarin for a month of so until my tissue valve had settled down. Well, only a few months after I was taken off warfarin I had a car accident...and the first thing my doctor said was...good thing you chose a tissue valve and you were off warfarin. But its defiantly not that simple either.
I will need another heart procedure in about 10 years, unrelated to my valve, so my valve will be replaced in about 10-15 years no matter what happens to my valve. There is a very real chance that the new tissue valves might last quite a lot longer than 10 years...my valve is reportedly lasting much better than predictions initially indicated, and remember, everyone is different, even if we have the same brand of tissue valve, there are a range of sizes to suit your particular aorta, and different sizes have different haemodynamic properties and hence different lifetime expectations....don't stress. Have cardiac echos every year or two, and as Doris Day sang..."Que sera sera"
Congenital bicuspid aortic valve was replaced at 49 years of age with St Jude Trifecta 27mm tissue valve. May 2012.