Parkinson's disease (PD) is a progressive neurodegenerative disorder affecting millions of people worldwide. While pharmacological treatments remain the first-line approach, advanced therapies such as deep brain stimulation (DBS) are recommended in selected patients to improve motor complications and quality of life, based on established neurological guidelines.
What is Deep brain stimulation (DBS)?
Deep brain stimulation (DBS) is a surgical technique in which electrodes are implanted in specific areas of the brain. These electrodes deliver electrical impulses to modulate neuronal activity to reduce the symptoms of Parkinson's disease.
Developed in the 1980s, DBS is now recognized as an effective alternative for patients who no longer respond adequately to medication. Unlike traditional treatments, it acts directly on dysfunctional brain circuits, providing a more targeted and sustained approach.
Limitations of Deep Brain stimulation
Deep brain stimulation improves motor symptoms but does not modify the underlying neurodegenerative process of Parkinson’s disease. Some symptoms, especially axial symptoms, continue to worsen despite stimulation.
- Balance problems and falls.
- Freezing (sudden blocking while walking).
- Speech and swallowing problems.
- Urinary incontinence.
In addition, cognitive problems may develop or worsen over time, limiting the benefits of DBS for some patients.
Benefits of DBS
Clinical studies have shown that DBS can significantly improve motor symptoms and quality of life in appropriately selected patients. For example, randomized controlled trials report improvements in motor function (measured by the Unified Parkinson’s Disease Rating Scale – UPDRS) ranging from approximately 30% to 60% in the “off-medication” state.
Improvements may include:
- Tremor reduction (often substantial and sometimes near-complete control)
- Reduced rigidity and bradykinesia
- Decreased motor fluctuations and dyskinesias
These outcomes are supported by studies such as the Movement Disorder Society and long-term clinical trials published in peer-reviewed neurology journals.
Patients also report an improvement in sleep quality, a reduction in pain, and a stabilization of their psychological state.
Long-term follow-up studies suggest that benefits on motor complications can persist for several years, although their magnitude may decrease over time as the disease progresses.
Who is eligible for DBS and how to get started?
Deep brain stimulation (DBS) is indicated for patients with Parkinson's disease who meet the following criteria:
- Idiopathic Parkinson's disease (excluding atypical Parkinson's syndromes).
- Advanced disease (at least 5 years since diagnosis).
- Positive response to dopaminergic treatments, but with motor complications such as on-off fluctuations and dyskinesias.
- Absence of severe cognitive or psychiatric disturbances.
- Good general health without serious progressive pathology.
The road to DBS begins with a thorough evaluation by a specialized medical team. Once a decision has been made, the procedure is performed under local or general anesthesia and the stimulation parameters are adjusted.
How does Deep Brain stimulation work?
The DBS process has several stages:
- Preoperative evaluation: Patients are carefully selected based on their medical condition, severity of symptoms, and response to current treatments.
- Electrode implantation: Under local anesthesia, electrodes are placed in specific areas of the brain, such as the subthalamic nucleus (STN) or the globus pallidus internus (GPI). These areas are involved in controlling movement.
- Electrical stimulation: A pacemaker-like device is implanted under the skin near the collarbone. It sends electrical impulses to electrodes to regulate brain activity.
- Adjustment and follow-up: After the procedure, stimulation parameters are adjusted to maximize benefits and minimize side effects.
Testimonials and recent advances : What the experts say
Recent advances in deep brain stimulation (DBS) focus on improving precision, safety, and individualization of treatment. Technologies such as directional electrodes and adaptive (closed-loop) stimulation systems allow more targeted modulation of brain activity, potentially improving symptom control while minimizing stimulation-related side effects. However, long-term clinical outcomes of these newer systems are still being studied.
According to the Movement Disorder Society, DBS is an established therapeutic option for managing motor complications in Parkinson’s disease when medication is no longer sufficient. Its effectiveness depends on careful patient selection, multidisciplinary evaluation, and specialized surgical expertise.
In Turkey, DBS programs are continuously evolving within specialized neurosurgical and neurology centers. These institutions integrate advanced imaging and modern stimulation technologies to improve procedural accuracy and patient follow-up.
While newer devices may improve targeting and reduce certain side effects, outcomes still vary between patients. DBS can significantly improve quality of life in appropriately selected cases, but it does not stop disease progression.
Overall, current expert consensus considers DBS a major therapeutic advancement in movement disorder management, with ongoing research exploring ways to further optimize its long-term effectiveness and safety.
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