Dr. Ivo Petrov presented his clinic's five year experience of endovascular treatment of CCSVI at the ISNVD 2016 Conference (International Society of Neurovascular Disease). The presentation included comments which refer to findings recently published "Hypercapnia and hypoxaemia due to impaired venous blood draining and significant improvement after endovascular treatment in patients with chronic cerebrospinal venous insufficiency"
http://www.termedia.pl/Hypercapnia-and-hypoxaemia-due-to-impaired-venous-blood-draining-and-significant-improvement-after-endovascular-treatment-in-patients-with-chronic-cerebrospinal-venous-insufficiency,76,28083,1,1.html

Discussion:
"Thus, it is reasonable to suggest that MS patients present with hypercapnia and hypoxaemia of the brain and spinal cord, which are at least partially caused by CCSVI, and that this pathological condition can be improved using an endovascular approach. It is unclear, however, if this beneficial effect is long lasting and has any influence on the natural course of MS. We suggest that future research should answer these questions."