Didn't Zamboni have a paper published about altered CSF fluid dynamics in m.s.? I've only read the abstract and don't understand much yet but I agree that the blood drainage definitely affects the CSF circulation. So I would think the reverse might be true as well.
It seems like low blood pressure is a possible characteristic of CCSVI to begin with...not sure whether this is as a result or a contributing cause of the entangling veins...but I'd place a reduction in CSF in with having low blood pressure as having the same effect on CCSVI, whatever that effect is.
"However, the truth in science ultimately emerges, although sometimes it takes a very long time," Arthur Silverstein, Autoimmunity: A History of the Early Struggle for Recognition