People who saw the most benefit were those with the relapsing-remitting form of MS, in which periods of remission, when the person feels relatively good, are followed by MS flares, Dake said.
People with more aggressive or more advanced forms of MS, including primary and secondary progressive MS, reported about a 40 percent drop in fatigue two months after the surgery, but the effect did not last at the one-year mark, Dake said.
MS is believed to be an autoimmune disease in which the body's immune system attacks myelin, or the substance that insulates nerve fibers of the central nervous system. The damage disrupts nerve signals traveling to and from the brain, which can lead to numbness, movement difficulties and blurred vision. Other symptoms can include fatigue and cognitive problems, sometimes described by those with MS as being in a fog.
Vein opening is unlikely to help regenerate damaged myelin, which causes the movement difficulties, Dake said, but opening blocked veins looks like it may help alleviate fatigue, at least in people with relapsing-remitting MS.
"It's a stretch to think opening up veins is going to deal with or reverse an injury that is due to demyelinating plaque, whereas the symptoms that are more general, such as fatigue and brain fog that are much more related to an obstruction in venous outflow from the brain -- those could potentially be reversed," he said.
Dake was scheduled to present his findings this week at the International Symposium on Endovascular Therapy in Miami Beach.
He cautioned that his research was not a randomized, controlled, clinical trial but rather a review of his clinical experience with 30 patients.
Therein lies the problem with CCSVI and its treatments, said Dr. Lily Jung, medical director of the neurology clinic at the Swedish Neuros
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