Risk factors for CCSVI are similar to risk factors for developing MS, UB study shows

The first study to investigate risk factors for the vascular condition called CCSVI (chronic cerebrospinal venous insufficiency) in volunteers without neurological disease has identified what the researchers call a remarkable similarity between this condition and possible or confirmed risk factors for multiple sclerosis (MS).

The University at Buffalo study investigated associations between CCSVI and demographic, clinical and environmental risk factors in a large control group of volunteers who did not have known central nervous system disease.

"Our results suggest that risk factors for CCSVI in this group of volunteers are remarkably similar to those of possible or confirmed importance to MS, but we do not yet understand the whole story," says Robert Zivadinov, MD, PhD, FAAN, professor of neurology at the UB School of Medicine and Biomedical Sciences, and senior author on the study.

Published today (Nov. 30) in PLoS One, the current study of 252 volunteers "was designed to help provide scientists and the MS patient community with new information that, combined with the results of studies that are still ongoing at UB, will ultimately help explain CCSVI and its relationship to MS," according to Kresimir Dolic, a lead author on the study. Dolic, a radiologist from the Department of Radiology, University Hospital, Split, Croatia, was a visiting fellow at the Buffalo Neuroimaging Analysis Center, part of UB's Department of Neurology, where the study was conducted.

CCSVI refers to impaired blood flow from the central nervous system to the periphery. It has been hypothesized that this narrowing of veins restricts blood flow from the brain, altering brain drainage, and may contribute to brain tissue injury that is associated with MS.

Yet, while CCSVI has generated intense interest among MS patients worldwide, and while independent scientific studies, including one of the largest to date being conducted by Zivadinov and UB colleagues, have suggested an association with MS, none have found conclusively that the condition is associated with MS.

What is Chronic cerebrospinal venous insufficiency (CCSVI)? Chronic cerebrospinal venous insufficiency is described as a chronic problem (ongoing) where blood from the brain and spine has trouble getting back to the heart.

It is caused by a narrowing in the veins (stenosis) that drain the brain and the spine. Blood takes longer to return to the heart, and it can reflux back into the brain and spine or cause oedema and leakage of red blood cells and fluids into the tissues of the brain and spine.

Blood that remains in the brain too long creates a delay in deoxyginated blood leaving the head ("slowed perfusion"). This can cause hypoxia, a lack of oxygen in the brain. Plasma and iron from blood deposited in the brain tissue can also be very damaging leading to iron along with other unwelcome cells crossing the crucial brain-blood barrier.