Deep Brain Stimulation for Parkinsons Disease Patients
(Also Called 'New Applications For Dbs', 'Mechanisms of DBS', 'New Applications For Dbs', 'DBS (Deep Brain Stimulation)')
Deep brain stimulation is a way to functionally modulate various nuclei in brain like subthalamic nucleus, the thalamus or globus pallidus without purposefully destroying or structurally altering the brain tissue. In deep brain stimulation, electrodes are placed in the thalamus (for essential tremor and multiple sclerosis) or in the subthalamic nucleus or globus pallidus (for Parkinson's disease or PD). The electrodes are connected by wires to a type of pacemaker device (called an impulse generator, or IPG) implanted under the skin of the chest, below the collarbone.
Once activated, the device sends continuous electrical pulses to the target areas in the brain, modifying the brain circuits that are responsible for motor symptoms of PD. This is better than thalamotomy or pallidotomy as it can be modulated as per needs of the patient and can be done without actually destroying parts of the brain.
The IPG can easily be programmed using a computer that sends radio signals to the IPG. Patients are given special magnets so they can externally turn the IPG on or off.
How is DBS performed?
Patients who are having stimulators placed on both sides of the brain will have their surgery divided into two parts. Most people with Parkinson's disease will require the surgery be done on both sides of the brain unless the symptoms are unilateral or there are other considerations like cognitive problems or age that dictates a unilateral or staged approach.
During the first surgery, the electrodes are placed into the brain, but left unconnected. This is the most critical part as the electrodes have to be placed in an exact location. There are several ways in which the electrodes are placed into the exact target areas of the brain. First these areas must be located. One way to locate the target areas is to rely only on CT or MRI scans. While some surgeons stop there, we use an electrode recording technique to map and target the specific areas that they will need to reach. Once the correct location is identified, the permanent electrodes are implanted. The loose ends are placed underneath the skin of the head and the incision is closed with sutures.
One week later, the patient is readmitted to the hospital for a very brief time. The patient is placed under general anesthesia and the extension wires are disconnected from the loose ends of the electrodes and then connected to the impulse generators. Two to four weeks later, the IPG is turned on and adjusted. It may take a few weeks until the simulators and medications are adjusted before patients receive adequate symptom relief. DBS causes very few side effects.
What is subthalamic nucleus deep brain stimulation?
After extensive clinical trials, stimulation of the subthalamic nucleus has been recognized as the most effective surgical treatment for Parkinson's disease, addressing not only tremors, but the full range of the disease's symptoms, including: rigidity, slowness of movement, stiffness, and walking concerns. Successful stimulation of the subthalamic nucleus allows patients to consistently reduce their medication while improving all of their other disease-related symptoms.
What are the advantages of deep brain stimulation?
Deep brain stimulation has many advantages. First, it does not require purposeful destruction of any part of the brain and therefore, has fewer complications than thalamotomy and pallidotomy.
In addition, the electrical stimulation is adjustable and can be changed as the person's disease changes or his or her response to medications change. No further surgery is necessary to make the adjustments.
Another significant advantage of deep brain stimulation relates to future treatments. Destructive surgery, such as thalamotomy or pallidotomy, may reduce the person’s potential to benefit from future therapies.
For example, future brain cell transplantation may be of great help to people with Parkinson's disease. There is concern that a pallidotomy or thalamotomy may prevent patients from benefiting from brain cell transplantation. This would not be the case with deep brain stimulation, as the stimulator could be turned off. The stimulator can also be turned off at any time if deep brain stimulation is causing excessive side effects.
How effective is the surgery?
The vast majority of properly selected patients (over 70%) experience a significant improvement of all their symptoms related to Parkinson's disease. Most people are able to significantly reduce their medications.
What kinds of movement problems are helped by DBS?
Deep brain stimulation of the subthalamic nucleus is effective for all major symptoms of Parkinson's disease, such as tremor, slowness of movement, rigidity, and problems with walking and balance. People bothered by involuntary movements such as dyskinesia often experience a marked reduction of these involuntary movements primarily because they are able to reduce their medications following surgery.
Deep brain stimulation of the globus pallidus is effective for a wide range of Parkinson's symptoms. It seems to be somewhat less effective for problems with walking and balance. Also, patients remain on the same average dose of medications following surgery.
Deep brain stimulation of the thalamus is only effective for tremor and rigidity. Consequently, deep brain stimulation of the thalamus is usually not performed for patients with Parkinson's disease.
As a rule of thumb whatever symptoms improve with Sinemet® are improved with DBS in PD patients.
What are the risks?
As with any surgical procedure, there are risks. There is a 2% to 3% risk of a serious and permanent complication such as brain hemorrhage causing, death, paralysis, changes in thinking, memory and personality, 4% risk of infection, and 1% risk of hardware breakdown. Talk to your doctor to see if these risks apply to you.
Is DBS experimental?
No. Deep brain stimulation is not experimental.
Who should consider DBS?
There are many important issues to be addressed when considering deep brain stimulation. These issues should be discussed with a movement disorders expert or a specially trained neurologist. A movement disorders expert is someone who has trained specifically in movement disorders.
One of the most important criteria is that the person has had an adequate trial of medications. Surgery is not recommended if medications can adequately control the disease. However, surgery should be considered for people who do not achieve satisfactory control with medications. Talk to your doctor to see if DBS is right for you.
Is age a factor?
DBS has been successful in treating people of different ages; however, each person should be assessed individually as to their stamina and overall health before considering surgery.
Where should the procedure be performed?
The first and most important recommendation is that the DBS procedure is performed in a place where there is a multi-disciplinary team of experts. This means neurologists, neurosurgeons, and neurophysiologists who have experience and specialized training in performing these types of surgeries.
The next most important consideration is how the surgery is done. Different centers may perform the procedure in different ways. It is very important to ask how the target (the thalamus or globus pallidus) is localized. It is clear that the chances of benefit and the risks of complications are directly related to how close the electrode is to the correct target.
Will I be asleep during the procedure?
Throughout most of the procedure you will remain awake. This allows the surgical team to interact with you when testing the effects of the stimulation. Small amounts of local anesthetic (pain-relieving medication) are given in sensitive areas. The vast majority of people experience minimal discomfort during the procedure.
What should I expect after DBS?
You may feel tired and sore but will be given medication and kept comfortable. Also, you may have irritation or soreness around the stitches and pin sites.
As with any surgery, there are some guidelines and limitations that you should follow after DBS. Be sure to discuss these with your doctor and ask questions before surgery. Understanding what you will be experiencing and knowing what to expect afterward can help ease some of the natural anxiety that comes with any medical procedure.
When will I be able to go home?
The average hospital stay for the first part of the DBS surgery is two to three days. For the second part of the surgery one week later, you will be in the hospital for less than 24 hours.
How should I care for the surgical area once I am home?
- Your stitches or staples will be removed 7-10 days after surgery.
- Each of the four pin sites should be kept covered with band-aids until they are dry. These should be changed every day as necessary.
- You will be able to wash your head with a damp cloth, avoiding the surgical area.
- You may only shampoo your hair the day after your stitches or staples are removed, but only very gently.
- You should not scratch or irritate the wound areas.
Will I have to limit my activity following DBS?
- You should not engage in light activities for 2 weeks after surgery. This includes housework and sexual activity.
- You should not engage in heavy activities for 4 to 6 weeks after surgery. This includes jogging, swimming, or any physical education classes. Anything strenuous should be avoided to allow your surgical wound to heal properly. If you have any questions about activities, call your doctor before performing them.
- You should not lift more than five pounds for at least two weeks.
- Depending on the type of work you do, you may return to work within 4 to 6 weeks.
Call your doctor immediately if you experience any of the following symptoms:
- Severe and persistent headaches
- Bleeding from your incision
- Redness or increased swelling in the area of the incision
- Loss of vision
- A sudden change in vision
- A persistent temperature of 101 degrees Fahrenheit or higher
Can I use electrical devices?
While you should be able to use most electronic devices, you should be aware that:
- Some devices, such as theft detectors and screening devices, like those found in airports, department stores, and public libraries, can cause your neurotransmitter to switch on or off. Usually, this only causes an uncomfortable sensation. However, your symptoms could get worse suddenly. Always carry the identification card given to you. With this, you may request assistance to bypass those devices.
- You will be able to use home appliances, computers, and cellular phones. They do not usually interfere with your implanted stimulator.
- You will be provided with a magnet to activate and deactivate your stimulator. This magnet may damage televisions, credit cards, and computer discs. Always keep it at least one foot away from these items.
National Institute of Neurological Disorders and Stroke, Deep Brain Stimulation for Parkinson’s Disease Information Page. www.ninds.nih.gov Accessed 5/16/2011
National Parkinson Foundation. Parkinson’s Disease: Treatment: Surgical Options: Deep Brain Stimulation. www.parkinson.org Accessed 5/16/2011
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This information is provided by Cleveland Clinic and is not intended to replace the medical advice of your doctor or health care provider. Please consult your health care provider for advice about a specific medical condition. This document was last reviewed on: 9/30/2010...#4080