a/v fistulas are often used for access in long term plasmapheresis treatment for MG.
It's the same type of fistulas used for dialysis.
Please ask the surgeon what type of fistula your sister is going to have. One is a "natural" fistula, where they use her own artery & vein (usually in the left arm), the other type I believe is gore-tex. Gore-Tex is a man made substance & if your sister has had problems with staph infections in the past, it may become a problem again with this foreign substance in her body.

Please google "fistula" and "plasmapheresis" for more info.

The reason I know about this is because I had had fistula work done for pheresis about 25 years ago.