I had an artificial aortic valve installed in 2007 at Brigham & Women's in Boston. Now that I'm getting a little older, it seems that I've become a little more forgetful. Yesterday just for the hell of it I googled "warfarin" and "dementia" and it seems recent research indicates that long-term warfarin use can cause dementia if (an important "if") your INR is either too high or too low. Anybody heard anything about this? I've had a busload of doctors over the years and not one has ever mentioned that possibility.