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deep brain stimulation
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What is deep brain stimulation?
Deep brain stimulation (DBS) is a surgical procedure that involves implanting an electrode into a specific area of the brain to alleviate symptoms of chronic pain and movement disorders caused by neurological disease. It is primarily used to treat patients with dystonia, essential tremor, or Parkinson's disease. For Parkinson's patients, DBS can decrease involuntary movements, improve gait and slowness, and reduce medication doses.
During the procedure, surgeons use techniques like magnetic resonance imaging (MRI) or computerized axial tomography (CAT) to precisely place the electrode in the brain. The electrode is connected to a neurostimulator, which sends electrical signals to disrupt the neuronal impulses causing pain or disordered movement. DBS is also being explored as a treatment for treatment-resistant depression. Electrodes may be placed in the thalamus, subthalamus, or globus pallidus, depending on the condition being treated. Although DBS can have severe side effects, including bleeding in the brain, infection, and neurological issues, it is also reversible since the electrode can be removed.
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How does deep brain stimulation work in the human body?
Deep brain stimulation (DBS) is a surgical procedure that involves implanting an electrode into a specific area of the brain to alleviate symptoms of chronic pain and movement disorders related to neurological diseases such as dystonia, essential tremor, or Parkinson's disease.
During the procedure, surgeons use techniques like magnetic resonance imaging to guide the precise placement of the electrode in the brain. The electrode is connected to a neurostimulator, which is implanted under the skin and sends electrical signals to disrupt the neuronal impulses causing pain or disordered movement.
Electrodes may be placed in the thalamus, subthalamus, or globus pallidus, depending on the condition being treated. Although DBS is reversible, potential side effects include bleeding in the brain, infection, and lead wire issues.
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What medical conditions can be treated with deep brain stimulation?
Deep brain stimulation (DBS) involves implanting an electrode in a specific area of the brain to alleviate symptoms of chronic pain and movement disorders caused by neurological disease. DBS is primarily used to treat patients affected by dystonia, essential tremor, or Parkinson disease. For Parkinson's patients, DBS can decrease involuntary movements, improve gait and slowness, and reduce medication doses. Experimental research has explored DBS for treatment-resistant depression, by implanting an electrode in the nucleus accumbens. Electrodes may be placed in the thalamus, the subthalamus, or the globus pallidus.
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What parts of the brain are usually targeted during deep brain stimulation?
During deep brain stimulation (DBS), electrodes are implanted in specific brain areas to alleviate symptoms of chronic pain and movement disorders related to neurological diseases. The primary targets for electrode placement include the thalamus, the subthalamus, and the globus pallidus.
- Thalamus In cases of essential tremor, the electrode is inserted into the thalamus to disrupt the neuronal impulses that cause uncontrollable movements. It is sometimes used in Parkinson's disease patients with severe tremor. Deep brain stimulation of the ventral intermediate thalamic nucleus (VL region) has proven effective in treating debilitating essential tremor.
- Subthalamus/Globus Pallidus For Parkinson's patients, the electrode is more commonly placed in the subthalamus or the globus pallidus, as irregular neuronal signaling in these areas results in the most severe movement disorders associated with the disease. These areas are also targeted for electrode placement in dystonia.
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What are the main risks or side effects of deep brain stimulation?
Deep brain stimulation (DBS) is a surgical procedure that involves implanting an electrode in a specific area of the brain to alleviate symptoms of chronic pain and movement disorders.
Because DBS is an invasive brain surgery, side effects can be severe. The most dangerous complication is bleeding within the brain, possibly leading to stroke or death. Other risks include infection at the incision sites or within the brain, which may require removal of the electrode, lead wire, and neurostimulator. Over time, battery failure or lead wire breakage may occur, requiring surgery to replace the defective DBS components. Physiological side effects include numbness or weakness of the face or limbs, vision problems, loss of balance, confusion, and disordered cognition.
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How do doctors decide if someone is a good candidate for deep brain stimulation?
Doctors assess several factors to determine if someone is a good candidate for deep brain stimulation (DBS). DBS is considered primarily for individuals with dystonia, essential tremor, or Parkinson's disease to alleviate symptoms of chronic pain and movement disorders caused by neurological disease.
To precisely place the electrode in the brain, surgeons use three-dimensional target coordinates obtained using techniques such as magnetic resonance imaging or computerized axial tomography.
DBS may not be suitable for all patients, as side effects can be severe, including bleeding within the brain, infection, or lead wire breakage. Physiological side effects include numbness of the face or limbs, weakness of the limbs, problems with vision, loss of balance, confusion, and disordered cognition.
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deep brain stimulation (DBS), surgical procedure in which an electrode is implanted into a specific area of the brain in order to alleviate symptoms of chronic pain and of movement disorders caused by neurological disease. DBS is used primarily to treat patients affected by dystonia, essential tremor, or Parkinson disease. In patients with Parkinson disease, DBS has the potential to decrease involuntary movements, improve debilitating problems with gait and slowness of movement, and reduce doses of medications. In addition, unlike ablative surgery for Parkinson disease, which creates a permanent lesion in the brain in an attempt to alleviate severe symptoms, DBS is reversible, since the electrode can be removed.
In DBS the electrode that is implanted in the brain is attached via a lead wire to a neurostimulator inserted under the skin, usually near the collarbone or in the abdomen. The neurostimulator sends electrical signals to the electrode. These signals work by disrupting the neuronal impulses that cause pain or disordered movement. To precisely place the electrode in the brain, surgeons rely on three-dimensional target coordinates obtained using techniques such as magnetic resonance imaging or computerized axial tomography. During surgery, a hole approximately 14 mm (0.6 inch) in diameter is made in the skull. A probe with an electrode attached to the end is then inserted through the hole. Although local anesthesia is used to block pain sensation in the brain and in the area of the skull where the hole is made, in this stage of the surgery the patient is only sedated. Sedation, as opposed to general anesthesia, is necessary because the patient must be able to respond to doctors in order to facilitate the accurate placement of the electrode. This is especially important in the immediate detection of side effects caused by improper electrode placement, since the patient can vocalize or otherwise signal feelings of numbness or weakness in certain parts of the body, such as the face, arms, or legs. Following electrode placement, a general anesthetic is administered to the patient, and the neurostimulator is implanted and is connected to the electrode by lead wires that are inserted under the skin.
An electrode may be placed in one of three parts of the brain: the thalamus, the subthalamus, or the globus pallidus. In essential tremor, the electrode is inserted in the thalamus, where it disrupts the neuronal impulses that cause uncontrollable movements. The electrode is sometimes placed in the thalamus in Parkinson disease patients who are affected by severe tremor. However, it is more common for the electrode to be inserted into the subthalamus or the globus pallidus in Parkinson patients, since aberrant neuronal signaling in these areas gives rise to the most severe movement disorders associated with the disease. These regions of the brain are also targeted for electrode placement in dystonia.
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Because DBS is an invasive brain surgery, side effects can be severe. The most dangerous complication associated with DBS is bleeding within the brain, which requires immediate surgery. If bleeding cannot be controlled, stroke or death may result. Another side effect that may manifest shortly after operation is infection at the incision sites or within the brain. This may necessitate the removal of the electrode, lead wire, and neurostimulator. Over the course of time, battery failure or lead wire breakage may occur, requiring surgery to replace the defective DBS components. In addition, the lead wires may move, affecting the placement of the electrode in the brain, or may erode through the skin, possibly causing infection or necessitating removal of the DBS system. Physiological side effects include numbness of the face or limbs, weakness of the limbs, problems with vision, loss of balance, confusion, and disordered cognition.