Thanks for your replies! You are correct, I think I got my terminology wrong, sorry. I will have a mechanical valve not a biological valve, thus the need for warfarin. I was also hoping to use the self testing kit for warfarin, as we spend much time in Africa, which could be rather tricky.
Good to hear for some people the valve replacement has been extremely successful. I'm hoping to have minimally invasive surgery but don't know if it will be possible. Apparently, they can try minimally invasive, but have a team ready to "crack" the ribs if necessary. Any experience?