Deep Brain Stimulation for Parkinson’s Disease: A Patient’s Guide
In brief: Deep brain stimulation, or DBS, may help selected people with Parkinson’s disease when motor symptoms, “off” periods, dyskinesia or tremor are no longer adequately controlled throughout the day with medication. DBS can improve symptoms, but it does not cure Parkinson’s disease or stop its progression.
Successful treatment depends on careful patient selection, accurate electrode placement, appropriate target selection, programming and long-term neurological follow-up.
What is deep brain stimulation?
During DBS surgery, thin electrodes are placed in carefully selected areas of the brain. They are connected to a small pulse generator, usually implanted beneath the skin of the upper chest.
The system delivers controlled electrical stimulation to brain circuits involved in movement. Unlike an ablative procedure, DBS does not intentionally destroy brain tissue. Stimulation settings can be adjusted as the patient’s symptoms and needs change.
Which Parkinson’s symptoms may improve?
DBS is primarily used to treat motor symptoms and medication-related complications, including:
Tremor
Muscular rigidity
Slowness of movement
Motor fluctuations
Prolonged or unpredictable “off” periods
Levodopa-induced dyskinesia
A patient’s response to levodopa is an important part of the assessment. In general, motor symptoms that improve with levodopa are more likely to improve with DBS. Medication-resistant tremor can sometimes respond even when its levodopa response is limited.
Which symptoms are less predictable?
DBS does not affect every symptom of Parkinson’s disease equally. Balance problems, freezing of gait, speech difficulties, swallowing problems and cognitive symptoms can respond unpredictably, particularly when they do not improve with levodopa.
DBS is not a treatment for dementia and may be unsuitable for patients with significant cognitive impairment or uncontrolled psychiatric illness.
When discussing DBS with patients, I emphasize that eligibility is not determined by age or diagnosis alone. The key question is whether the individual patient’s most disabling symptoms are likely to respond to stimulation.
Who may be a suitable candidate?
A patient may be considered for DBS when:
The diagnosis is consistent with idiopathic Parkinson’s disease
Motor symptoms remain responsive to levodopa
Medication benefit has become inconsistent or does not last throughout the day
Dyskinesia or motor fluctuations affect quality of life
Tremor remains disabling despite appropriate medical treatment
Cognitive and psychiatric status is suitable for surgery
General health allows the procedure to be performed safely
The patient understands the need for long-term programming and follow-up
There is no single age or disease-duration rule that determines eligibility. Health status, symptoms, cognition, surgical risk and personal treatment goals must be considered together.
You can read more about who may be a suitable candidate for DBS in our detailed patient-selection guide.
How is a patient evaluated?
DBS evaluation is generally multidisciplinary and may involve a movement-disorders neurologist, functional neurosurgeon, neuropsychologist and other specialists.
The assessment may include:
Confirmation of the Parkinson’s disease diagnosis
Detailed review of symptoms and medication response
Levodopa challenge testing
Brain MRI
Neuropsychological assessment
Psychiatric evaluation when indicated
General medical and anaesthetic assessment
Discussion of the patient’s priorities and expectations
The purpose is not simply to determine whether surgery is technically possible. It is to understand whether DBS is likely to improve the symptoms that matter most to the patient.
Which part of the brain is targeted?
The two most commonly used targets in Parkinson’s disease are the subthalamic nucleus, or STN, and the internal segment of the globus pallidus, or GPi.
Both can improve motor symptoms in appropriately selected patients. The choice depends on the patient’s symptom pattern, medication requirements, cognitive and psychiatric profile and treatment priorities.
Neither target is universally better. The differences are explained in more detail in STN versus GPi: How is the DBS target selected?.
What happens during DBS treatment?
DBS treatment generally involves placing the electrodes in the brain and implanting the pulse generator. Depending on the technique and centre, electrode placement may be performed with the patient awake for part of the operation or under general anaesthesia.
The system is programmed after surgery. Several visits may be required to identify settings that provide the best balance between symptom control and side effects.
Programming is therefore a central part of treatment, not simply a final technical adjustment. Learn more about what happens during DBS programming.
Will medication still be necessary?
Many patients continue to take Parkinson’s medication after DBS. Medication may sometimes be reduced, particularly after successful STN stimulation, but this is not guaranteed.
The goal is not necessarily to eliminate medication. It is to achieve better overall symptom control while reducing “off” time, dyskinesia and treatment-related side effects.
Medication should only be adjusted under the supervision of the treating neurological team.
What are the risks?
As with any intracranial procedure, DBS carries potential risks. These may include:
Intracranial bleeding
Infection
Seizure
Stroke or neurological deficit
Hardware malfunction or lead displacement
Wound or device-related complications
Stimulation-related speech, balance, mood or movement problems
Need for device revision or additional surgery
Some stimulation-related effects can improve when the settings are changed. Individual risk varies according to the patient’s health, anatomy and planned procedure.
What should patients realistically expect?
DBS may provide meaningful improvement in selected symptoms, but it does not return the nervous system to its condition before Parkinson’s disease.
Realistic treatment goals may include:
More predictable movement during the day
Reduced “off” time
Less troublesome dyskinesia
Better tremor control
Greater independence in daily activities
Improved quality of life
Patients and their families should understand that DBS is a long-term treatment programme involving surgery, programming, medication adjustment and continued neurological care.
Can international patients be assessed before travelling?
An initial review may be possible using medical reports, medication history, neurological examination videos and brain MRI records.
However, final DBS candidacy generally requires an in-person neurological, neuropsychological and surgical assessment. International patients can review the required documents in the online DBS evaluation guide.
Frequently asked questions
Does DBS cure Parkinson’s disease?
No. DBS treats selected symptoms but does not cure Parkinson’s disease or stop its progression.
Is DBS only for very advanced disease?
Not necessarily. DBS may be considered when motor fluctuations, dyskinesia or disabling tremor interfere with quality of life despite optimized medical treatment. It should not automatically be postponed until severe cognitive, balance or general health problems develop.
Can DBS improve walking and balance?
The response varies. Gait symptoms that improve with levodopa may improve with DBS. Levodopa-resistant freezing and balance problems are less predictable.
How long does the battery last?
Battery life depends on the device, stimulation settings and whether the system is rechargeable. Rechargeable systems may operate for many years, while non-rechargeable generators require replacement when their battery is depleted.
Conclusion
Deep brain stimulation is an established treatment option for carefully selected patients whose motor symptoms or medication-related complications are no longer adequately controlled throughout the day.
The decision should be based on the patient’s diagnosis, symptom profile, medication response, cognition, general health and expectations. A multidisciplinary assessment is essential before determining whether DBS is appropriate.
Dr. Kaan Tugberk OzdemirNeurosurgeon – İzmir, Türkiye
This article is intended for general educational purposes and does not replace an individual medical assessment. DBS candidacy and target selection must be determined through a detailed multidisciplinary evaluation.
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