You do not have to take blood thinners for repair back in 1970's. I was a child back then. But when I got older and at one point, a smoker and no insurance, no check ups on the valve. When I did have the replacement, I did go on Warfarin and had the clicks. Once you have a replacement Aortic Valve, you will be on blood thinners for life. I would trade for a different kind of Blood Thinner to have no more blood work every month, and be able to eat all the green veggies. And the valve I had replace was my original one I was born with.30 years sounds like a pretty good deal for no Warfarin or ticking. I might take a second surgery later for that kind of trade.