I have had plasmapheresis off and on since February. I got a catheter in my neck in March and it is still in place. I get good results immediately after the treatment, but find it wears off for me after several days. I have not had it for a week now, but can definitely tell a difference in swallowing, neck weakness and pain, breathing and overall strength.
I am trying to stick it out as long as I can between treatments, but will probably have to get more this coming week.