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Researchers review studies on CCSVI-MS link
Date:10/3/2011

TORONTO, Ont., Oct. 3, 2011Studies that examined the possible link between vein blockages and multiple sclerosis are so inconsistent that it's impossible to reach a firm conclusion about the controversial theory, a new review has found.

Overall, the studies found the blockages known as chronic cerebrospinal venous insufficiency, or CCSVI, are found more often in people who have MS than those who do not.

But a team of researchers and physicians lead by Dr. Andreas Laupacis of St. Michael's Hospital in Toronto said more research was needed.

Italian Dr. Paola Zamboni has suggested that MS may be caused by blockages in the veins in the neck, causing iron deposition in the brain, which triggers an autoimmune reaction. He proposed that unblocking the veins by mechanically widening them improves the symptoms of MS.

Canadian researchers analyzed eight published studies carried out in the United States, Germany, Italy and Japan that used ultrasound to diagnose CCSVI and compared MS patients with non-MS patients.

They found the quality of the studies varied and there were large differences in the results. In general, the studies were small and had incomplete descriptions of the training of those conducting the ultrasounds. None of them reported the degree to which the people conducting the ultrasounds knew whether the subject was an MS patient. Some of the studies found no difference in the frequency of CCSVI between MS and non-MS patients while others found large differences.

When the results of all the studies were combined statistically, CCSVI was found more frequently in those with MS than those who did not have it.

The analysis of the studies was financed by the Canadian Institutes of Health Research. Portions of the study were published today in the Canadian Medical Association Journal.

Dr. Laupacis, executive director of the Li Ka Shing Knowledge Institute of St. Michael's Hospital,
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Contact: Leslie Shepherd
shepherdl@smh.ca
416-864-6094
St. Michael's Hospital
Source:Eurekalert

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