AI Article Synopsis

  • Exaggerated beta frequency activity in the subthalamic nucleus may be linked to bradykinesia in Parkinson's disease, but previous studies were limited to the immediate postoperative period.
  • Local field potentials were recorded from deep brain stimulation electrodes months after implantation to investigate the relationship between beta power dynamics and motor performance in upper limb tasks among 9 Parkinson's patients.
  • Results showed that while beta power suppression was observed during repeated movements, this waned over time alongside decreased movement frequency and amplitude, suggesting beta power changes could serve as a biomarker for bradykinesia and be useful for feedback control in ongoing deep brain stimulation therapy.

Article Abstract

Background: Exaggerated oscillatory activity in the beta frequency band in the subthalamic nucleus has been suggested to be related to bradykinesia in Parkinson's disease (PD). However, studies seeking correlations between such activity in the local field potential and motor performance have been limited to the immediate postoperative period, which may be confounded by a stun effect that leads to the temporary alleviation of PD deficits.

Methods: Local field potentials were recorded simultaneously with motor performance in PD patients several months after neurostimulator implantation. This was enabled by the chronic implantation of a pulse generator with the capacity to record and transmit local field potentials from deep brain stimulation electrodes. Specifically, we investigated oscillatory beta power dynamics and objective measures of bradykinesia during an upper limb alternating pronation and supination task in 9 patients.

Results: Although beta power was suppressed during continuously repeated movements, this suppression progressively diminished over time in tandem with a progressive decrement in the frequency and amplitude of movements. The relationship between changes within local field potentials and movement parameters was significant across patients, and not present for theta/alpha frequencies (5-12 Hz). Change in movement frequency furthermore related to beta power dynamics within patients.

Conclusions: Changes in beta power are linked to changes in movement performance and the sequence effect of bradykinesia months after neurostimulator implantation. These findings provide further evidence that beta power may serve as a biomarker for bradykinesia and provide a suitable substrate for feedback control in chronic adaptive deep brain stimulation. © 2017 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5575541PMC
http://dx.doi.org/10.1002/mds.27068DOI Listing

Publication Analysis

Top Keywords

beta power
20
local field
16
months neurostimulator
12
neurostimulator implantation
12
field potentials
12
bradykinesia months
8
motor performance
8
deep brain
8
brain stimulation
8
power dynamics
8

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!