Table of Contents Author Guidelines Submit a Manuscript
Parkinson’s Disease
Volume 2011 (2011), Article ID 507416, 4 pages
Clinical Study

Effect of Deep Brain Stimulation on Parkinson's Nonmotor Symptoms following Unilateral DBS: A Pilot Study

1Center for Movement Disorders & Neurorestoration, College of Medicine, University of Florida, Gainesville, FL 32610, USA
2Division of Neurology, Scripps Clinic Torrey Pines, La Jolla, CA 92037, USA
3Department of Neurology, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
4Department of Biostatistics, University of Florida, Gainesville, FL 32610, USA
5Center for Neurological Restoration, Cleveland Clinic, Cleveland, OH, USA

Received 23 June 2011; Accepted 30 September 2011

Academic Editor: Fabrizio Stocchi

Copyright © 2011 Nelson Hwynn et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Parkinson’s disease (PD) management has traditionally focused largely on motor symptoms. Deep brain stimulation (DBS) of the subthalamic nucleus (STN) and globus pallidus internus (GPi) are effective treatments for motor symptoms. Nonmotor symptoms (NMSs) may also profoundly affect the quality of life. The purpose of this pilot study was to evaluate NMS changes pre- and post-DBS utilizing two recently developed questionnaires. Methods. NMS-Q (questionnaire) and NMS-S (scale) were administered to PD patients before/after unilateral DBS (STN/GPi targets). Results. Ten PD patients (9 STN implants, 1 GPi implant) were included. The three most frequent NMS symptoms identified utilizing NMS-Q in pre-surgical patients were gastrointestinal (100%), sleep (100%), and urinary (90%). NMS sleep subscore significantly decreased (−1.6 points ± 1.8, 𝑃 = 0 . 0 3 ). The three most frequent NMS symptoms identified in pre-surgical patients using NMS-S were gastrointestinal (90%), mood (80%), and cardiovascular (80%). The largest mean decrease of NMS scores was seen in miscellaneous symptoms (pain, anosmia, weight change, and sweating) (−7 points ± 8.7), and cardiovascular/falls (−1.9, 𝑃 = 0 . 0 2 ). Conclusion. Non-motor symptoms improved on two separate questionnaires following unilateral DBS for PD. Future studies are needed to confirm these findings and determine their clinical significance as well as to examine the strengths/weaknesses of each questionnaire/scale.