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other treatments fail, DBS might prove to be a viable option. The widening list of targets may include depression, cluster headache, Tourette's syndrome, craniofacial pain, and obsessive compulsive disorder; clinical trials in those areas are currently underway or have been completed. "The future looks really Nike Uptempo 97 Black
Such positives have inspired a flurry of clinical investigation into other possible applications for DBS, which might extend beyond Parkinson's and movement disorders. "The brain really controls Nike Uptempo Heat Map
In Parkinson's patients whose medications' power is diminishing, "DBS is almost standard of care," says Kendall Lee, assistant professor of neurosurgery and physiology at the Mayo Clinic in Rochester, Minn. While the nuances of the underlying mechanisms are not well understood, "DBS appears to be like a drug, able to evoke the release of neurotransmitters," he explains. One advantage DBS offers is its specificity, he says. Exact placement of the electrodes relies on the patient being awake during surgery, so they can be asked questions about pain or be asked to perform different movement tasks that will guide the surgeon. Another advantage, says Lee, is that DBS is reversible that is, the level and rate of stimulation can be changed or stopped. The patient also controls the device, which can be turned on or off by waving a controller over the battery in his or her chest.
DBS was first approved by the Food and Drug Administration in the late 1990s and is now approved to treat movement disorders, like tremor; dystonia, which causes involuntary muscle contractions; and Parkinson's, for which DBS is typically used when patients can no longer rely on medications to manage their worsening symptoms. A study in the Journal of the American Medical Association in January found that subjects with advanced Parkinson's had an improved quality of life and about four more hours per day of freedom from troubling motor control symptoms than did those undergoing the best medical therapy.
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"I thought, 'Oh, my God, that's brain surgery,' " recalls Bill Schmalfeldt. He was considering participating in a clinical trial the only one testing so called deep brain stimulation in patients with early stage Parkinson's disease that might result in electrodes being permanently implanted deep inside his head. Diagnosed with Parkinson's disease at age 45, Schmalfeldt, now 54, found himself trolling several years ago for a research study he could join. Why? His work as a public liaison for the National Institutes of Health involved doing podcasts "extolling the value of clinical research."
Pushing his worries aside, Schmalfeldt underwent the DBS surgery in June of 2007. The procedure included having a battery pack implanted in his chest to drive the electrical stimulation in the electrodes that act to jam dysfunctional signaling in the brain. While he got randomly assigned to get DBS, other patients who volunteered for the study were not given the surgery but periodically undergo the same eight day stretches of medical observation at Vanderbilt Medical Center in Nashville.
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bright for DBS," Lee says.
He had understandable reservations. "You'd be insane not to have some worries about it," he says. Any surgery carries risk, and deep brain stimulation (DBS), a form of brain stimulation therapy, involves drilling at least one hole in the skull to snake electrodes to precise locations far into the cavernous folds of gray matter. Though it rarely happens, a brain bleed during the DBS procedure can leave a person dead.
"To study any treatment that might slow progression, you have to study it very, very early" in the course Atlanta Nike Uptempo of a patient's illness, says neurologist David Charles, an associate professor at Vanderbilt University School of Medicine and lead researcher in the trial in which Schmalfeldt is participating. Because DBS isn't offered until a patient's symptoms have stopped responding well to medication, he had to get special FDA approval for the trial. Medtronic, the maker of the only approved DBS device, is a partial sponsor of the research, says Charles.
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