Here's a paper that comprehensively goes over the use of stents in the veins of hemodialysis patients. Most have a patency rate of under 50% after 12 months.
Of course, the stresses put on the stents during dialysis differ greatly from the stresses placed on them when used to treat CCSVI. Still, one must always keep in mind that the stents in current use were not designed to withstand the twisting, bending, and torque that they experience when placed in the jugular veins above the clavicle.
I posted this info before, but nobody seemed very interested…