Hi, I'm a fairly long term patient one may say. After an bypass and some unusual events with my av fistula that I thought was long dead I think there's some case to consider a link between the av fistulas and heart problems. I'm saying heart problems just to put it nicely. About a year ago some blood was taken from my old fistula and it died off some more but with that a huge weight of stress also went away. I wasn't aware of this stress but just aware of it going away. It was a relief but also unpleasant to think that such stress had been there 33 years. Anyway, it made me think that the stress from the fistula was a major factor in my heart attacks. There are a few medical articles online but the docs never mentioned any of this when I had a bypass. Kd.