The U.S. Food and Drug Administration is warning about injuries and death associated with the use of an experimental procedure sometimes called “liberation therapy” or the “liberation procedure” to treat chronic cerebrospinal venous insufficiency (CCSVI).
Some researchers believe that CCSVI, which is characterized by a narrowing (stenosis) of veins in the neck and chest, may cause multiple sclerosis (MS) or may contribute to the progression of the disease by impairing blood drainage from the brain and upper spinal cord.
However, studies exploring a link between MS and CCSVI are inconclusive, and the criteria used to diagnose CCSVI have not been adequately established.
“Because there is no reliable evidence from controlled clinical trials that this procedure is effective in treating MS, FDA encourages rigorously-conducted, properly-targeted research to evaluate the relationship between CCSVI and MS,” said William Maisel, M.D., M.P.H., chief scientist and deputy director for science in the FDA’s Center for Devices and Radiological Health.
“Patients are encouraged to discuss the potential risks and benefits of this procedure with a neurologist or other physician who is familiar with MS and CCSVI, including the CCSVI procedures and their outcomes.”
The experimental procedure uses balloon angioplasty devices or stents to widen narrowed veins in the chest and neck. However, the FDA has learned of death, stroke, detachment and migration of the stents, damage to the treated vein, blood clots, cranial nerve damage and abdominal bleeding associated with the experimental procedure. Balloon angioplasty devices and stents have not been approved by the FDA for use in treating CCSVI.
MS is a progressive, immune-mediated disorder of the brain and spinal cord. In MS, the lining around nerve fibers, and often the nerve fibers themselves, in the brain and spinal cord are injured, resulting in significant and disabling neurological symptoms. The underlying cause of MS is not known.