I had my aortic valve replaced 4 years ago with a bovine tissue valve and all is well with it. I now have to have rotator cuff surgery. I know that people with mechanical replacement valves have to deal with the blood thinner during other surgeries. But I am wondering if there are any issues that people like me with biological replacement valves should be aware of when having surgery such as this for my rotator cuff? Is there anything I should be concerned about or do in advance or look for after surgery? Thank you. Ellen