Deep Brain Stimulation for Parkinson's Disease
Deep brain stimulation (DBS) is a surgical procedure used to treat a variety of disabling neurological symptoms—most commonly the debilitating symptoms of Parkinson’s disease (PD), such as tremor, rigidity, stiffness, slowed movement, and walking problems. The procedure is also used to treat essential tremor, a common neurological movement disorder. At present, the procedure is used only for patients whose symptoms cannot be adequately controlled with medications.DBS uses a surgically implanted, battery-operated medical device called a neurostimulator—similar to a heart pacemaker and approximately the size of a stopwatch—to deliver electrical stimulation to targeted areas in the brain that control movement, blocking the abnormal nerve signals that cause tremor and PD symptoms. Before the procedure, a neurosurgeon uses magnetic resonance imaging (MRI) or computed tomography (CT) scanning to identify and locate the exact target within the brain where electrical nerve signals generate the PD symptoms. Some surgeons may use microelectrode recording—which involves a small wire that monitors the activity of nerve cells in the target area—to more specifically identify the precise brain target that will be stimulated. Generally, these targets are the thalamus, subthalamic nucleus, and globus pallidus.The DBS system consists of three components: the lead, the extension, and the neurostimulator. The lead (also called an electrode)—a thin, insulated wire—is inserted through a small opening in the skull and implanted in the brain. The tip of the electrode is positioned within the targeted brain area.The extension is an insulated wire that is passed under the skin of the head, neck, and shoulder, connectng the lead to the neurostimulator. The neurostimulator (the "battery pack") is the third component and is usually implanted under the skin near the collarbone. In some cases it may be implanted lower in the chest or under the skin over the abdomen.Once the system is in place, electrical impulses are sent from the neurostimulator up along the extension wire and the lead and into the brain. These impulses interfere with and block the electrical signals that cause PD symptoms.
Unlike previous surgeries for PD, DBS does not damage healthy brain tissue by destroying nerve cells. Instead the procedure blocks electrical signals from targeted areas in the brain. Thus, if newer, more promising treatments develop in the future, the DBS procedure can be reversed. Also, stimulation from the neurostimulator is easily adjustable—without further surgery—if the patient’s condition changes. Some people describe the stimulator adjustments as "programming."
Although most patients still need to take medication after undergoing DBS, many patients experience considerable reduction of their PD symptoms and are able to greatly reduce their medications. The amount of reduction varies from patient to patient but can be considerably reduced in most patients. The reduction in dose of medication leads to a significant improvement in side effects such as dyskinesias (involuntary movements caused by long-term use of levodopa). In some cases, the stimulation itself can suppress dyskinesias without a reduction in medication.
The NINDS supports research on DBS to determine its safety, reliability, and effectiveness as a treatment for PD. Currently, NINDS-supported scientists are trying to determine the site(s) in the brain where DBS surgery will be most effective in reducing PD symptoms. These researchers are also comparing DBS to other PD therapies to find out which is more effective.
View a list of studies currently seeking patients.
View more studies on this condition.
Parkinson's Disease Foundation (PDF)
National nonprofit organization that supports Parkinson's disease research, education, and public advocacy programs.
New York, NY 10018
Raises and distributes money for the most promising research leading to a cure for Parkinson's disease. Partners with the Tuchman Foundation to ensure that every dollar donated by individuals and all net proceeds of events go directly to research. The Alliance is also devoted to improving quality of life within the DBS-STN community through an affiliated resource, www.DBS-STN.org.
P.O. Box 308
Kingston, NJ 08528-0308
American Parkinson Disease Association
Seeks to “Ease the Burden – Find the Cure” through funding scientific research. Provides comprehensive patient/caregiver support and education.
135 Parkinson Avenue
Staten Island, NY 10305-1425
Young Onset Center: 877-223-3801
National Parkinson Foundation
Provides research, patient services, clinical studies, public and professional education, and physician referrals at over 60 locations and through a nationwide network of chapters and support groups.
200 SE 1st Street
Miami, FL 33131