• Wolf-Julian Neumann, Franziska Staub, Andreas Horn, Julia Schanda, Joerg Mueller, Gerd-Helge Schneider, Peter Brown, and Andrea A Kühn.
• Department of Neurology, Campus Virchow Klinikum, Charité - University Medicine Berlin, Berlin, Germany.
• Neuromodulation. 2016 Jan 1; 19 (1): 20-24.

ObjectivesRecent studies suggest that oscillatory beta activity could be used as a state biomarker in patients with Parkinson's disease for subthalamic closed-loop stimulation with the intention of improving clinical benefit. Here we investigate the feasibility of subthalamic recordings via a novel chronically implanted pulse generator.MethodsSubthalamic local field potential recordings were obtained from eight patients before and during deep brain stimulation (DBS). All data were analyzed in the frequency domain using Fourier transform-based methods and compared between ON and OFF stimulation conditions.ResultsDistinct peaks of oscillatory beta band activity were found in 12 of 15 electrodes. DBS induced a significant frequency specific suppression of oscillatory beta activity (p = 0.002).ConclusionThe results of the study suggest that oscillatory beta band synchronization and its modulation by DBS is recordable with a system suitable for chronic implantation and may serve as a biomarker for subthalamic closed-loop stimulation in patients with Parkinson's disease.© 2015 International Neuromodulation Society.

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