Researchers assessed the outcome of Deep Brain Stimulation of the subthalamic nucleus (STN-DBS) in people with Parkinson's Disease over a period of 10 years. Deep Brain Stimulation (DBS) involves the use of electrodes that are implanted into the brain and connected to a small electrical device called a pulse generator that can be externally programmed. DBS requires careful programming of the stimulator device in order to work correctly. 
DBS improved the Parkinson's Disease symptom score by 25% in comparison to no treatment, including resting and action tremor by over 85%, and bradykinesia by 23%. It did not stop deterioration in speech, walking, and postural instability, including falling and freezing. L-dopa dosages reduced to about 63% of what they were initially. Daily living activity also improved. Dyskinesia and motor fluctuation scores also remained significantly lower. Potential adverse events included : a trend to weight loss, visual hallucinations, impulse control disorders possibly related to dopamine agonists, progressive cognitive decline culminating in dementia, device related infections.
DBS improved the Parkinson's Disease symptom score by 25% in comparison to no treatment, including resting and action tremor by over 85%, and bradykinesia by 23%. It did not stop deterioration in speech, walking, and postural instability, including falling and freezing. L-dopa dosages reduced to about 63% of what they were initially. Daily living activity also improved. Dyskinesia and motor fluctuation scores also remained significantly lower. Potential adverse events included : a trend to weight loss, visual hallucinations, impulse control disorders possibly related to dopamine agonists, progressive cognitive decline culminating in dementia, device related infections. 
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