24 June 2014
Deep brain stimulation (DBS) has become a well-recognized non- pharmacologic treatment that improves motor symptoms of patients with early and advanced Parkinson’s disease. Evidence now indicates that DBS can decrease the number and severity of non motor symptoms of patients with Parkinson’s disease (PD) as well, according to a review published in the Journal of Parkinson’s Disease.
“Non motor features are common in PD patients, occur across all disease stages, and while well described, are still under-recognized when considering their huge impact on patients’ quality of life,” says Lisa Klingelhoefer, MD, a fellow at the National Parkinson Foundation International Centre of Excellence, Department of Neurology, King’s College Hospital and King’s College, London.
For example, DBS of the subthalamic nucleus (STN) is effective for alleviating sleep problems and fatigue associated with PD, producing noticeable long-term improvements in sleep efficiency and the quality and duration of continuous sleep. DBS also decreases nighttime and early morning dystonia and improves nighttime mobility. “DBS can contribute to better sleep, less daytime somnolence, improved mobility, and less need for dopamine replacement therapy,” says Dr. Klingelhoefer.
The effects of DBS on some other non motor symptoms of PD are less clear cut and transient worsening of neuropsychological and psychiatric symptoms have been reported. For instance, behavioral disorders such as impulsivity (e.g. hypersexuality, pathological gambling, and excessive eating) can occur or worsen in PD patients after STN DBS. While pre-existing drug-induced psychotic symptoms like hallucinations often disappear after STN DBS, transient psychotic symptoms such as delirium may emerge in the immediate post-operative period. Similarly, conflicting reports have found that STN DBS improves, worsens, or does not change mood disorders such as depression, mania, or anxiety.
“Further work is required in order to fully understand the mechanisms and impact of DBS of the STN or other brain structures on the non motor symptoms of PD,” concludes Dr. Klingelhoefer. She suggests that in the future, non motor symptoms of PD may become an additional primary indication for DBS.
PD is the second most common neurodegenerative disorder in the United States, affecting approximately one million Americans and five million people worldwide. Its prevalence is projected to double by 2030. The most characteristic symptoms are movement-related, such as involuntary shaking and muscle stiffness. Non motor symptoms, such as worsening depression, anxiety, olfactory dysfunction, sweating, bladder and bowel dysfunction, and sleep disturbances, can appear prior to the onset of motor symptoms.
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NOTES FOR EDITORS
“An Update of the Impact of Deep Brain Stimulation on Non Motor Symptoms in Parkinson’s Disease,” by Lisa Klingelhoefer, Michael Samuel, K. Ray Chaudhuri, and Keyoumars Ashkan (DOI:
10.3233/JPD-130273). Volume 4/Issue 2 (Special Issue on Mental Dysfunction and Parkinson’s Disease). Openly available at http://iospress.metapress.com/content/e240nx3752596652/fulltext.pdf.
Full text of the article is also available to credentialed journalists upon request. Contact Daphne Watrin, IOS Press, at +31 20 688 3355 or d.watrin@iospress.nl to obtain a copy or request additional information. Journalists wishing to interview the authors should contact Dr. Lisa Klingelhoefer at Lisa.klingelhoefer@nhs.net.
ABOUT THE JOURNAL OF PARKINSON’S DISEASE (JPD)
Launched in June 2011 the Journal of Parkinson’s Disease is dedicated to providing an open forum for original research in basic science, translational research and clinical medicine that will expedite our fundamental understanding and improve treatment of Parkinson’s disease. The journal is international and multidisciplinary and aims to promote progress in the epidemiology, etiology, genetics, molecular correlates, pathogenesis, pharmacology, psychology, diagnosis and treatment of Parkinson’s disease. It publishes research reports, reviews, short communications, and letters-to-the- editor and offers very rapid publication and an affordable open access option.
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