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New studies question vascular multiple sclerosis hypothesis and treatment
Date:8/2/2010

Two important new studies challenge the controversial hypothesis that venous congestionchronic cerebrospinal venous insufficiency (CCSVI)contributes to the development of multiple sclerosis (MS). This theory has resulted in many MS patients receiving experimental endovascular angioplasty, a treatment for MS unproven by clinical trials. The studies refuting the CCSVI theory with the first negative medical evidence on the subject, are available today in Annals of Neurology, a journal published by Wiley-Blackwell on behalf of the American Neurological Association.

For nearly 150 years it has been known that focal MS lesions tend to develop around cerebral veins that are thought to the portal by which inflammatory cells targeting myelin enter the brain. However, a 2009 study by Zamboni et al. offered an alternative theory suggesting that chronically impaired venous drainage (blood flow) from the central nervous systema term that he labeled Chronic Cerebrospinal Venous Insufficiency or CCSVIleads to MS development.1 Zamboni et al. also claimed that endovascular angioplasty was markedly effective in MS patients.2 Zamboni's work gained much attention in the press, especially their report that ultrasound diagnosis of CCSVI perfectly matched an MS diagnosis with 100% sensitivity and 100% specificity.

"These two papers should add a note of caution for MS patients and physicians who are contemplating interventions for possible venous abnormalities based on the findings of Zamboni. At this time, the theory must be considered unconfirmed and unproven. Such interventions carry risk, and several people have already been harmed by the inappropriate application of venous angioplasty and stenting for MS," says Stephen L. Hauser, M.D., the Robert A. Fishman Distinguished Professor and Chair of the Department of Neurology at the University of California, San Francisco, and editor-in-chief of the Annals of Neurology. A previously published review of the
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Contact: Dawn Peters
healthnews@wiley.com
781-388-8408
Wiley-Blackwell
Source:Eurekalert

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