Spectral and spatial distribution of subthalamic beta peak activity in Parkinson’s disease patients.

Authors
Darcy N, Lofredi R, Al-Fatly B, Neumann WJ, HĆ¼bl J, BrĆ¼cke C, Krause P, Schneider GH, KĆ¼hn A.
Journal
Exp Neurol.

Abstract

Current efforts to optimise subthalamicĀ deep brain stimulationĀ inĀ Parkinson’s diseaseĀ patients aim to harness local oscillatory activity in the beta frequency range (13ā€“35Ā Hz) as a feedback-signal for demand-based adaptive stimulation paradigms. A high prevalence of beta peak activity is prerequisite for this approach to become routine clinical practice. In a large dataset of postoperative rest recordings from 106 patients we quantified occurrence and identified determinants of spectral peaks in the alpha, low and high beta bands. At least one peak in beta band occurred in 92% of patients and 84% of hemispheres off medication, irrespective of demographic parameters, clinical subtype or motor symptom severity. Distance to previously described clinical sweet spot was significantly related both to beta peak occurrence and to spectral power (rho āˆ’0.21, p 0.006), particularly in the high beta band. Electrophysiological landscapes of our cohort’s dataset in normalised space showed divergent heatmaps for alpha and beta but found similar regions for low and high beta frequency bands. We discuss potential ramifications for clinicians’ programming decisions. In summary, this report provides robust evidence that spectral peaks in beta frequency range can be detected in the vast majority of ParkinsonianĀ subthalamic nuclei, increasing confidence in the broad applicability of beta-guided deep brain stimulation.

Published: Oct 2022
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