Time dependent subthalamic local field potential changes after DBS surgery in Parkinson's disease

Manuela Rosa, Sara Marceglia, Domenico Servello, Guglielmo Foffani, Lorenzo Rossi, Marco Sassi, Simona Mrakic-Sposta, Roberta Zangaglia, Claudio Pacchetti, Mauro Porta, Alberto Priori

Research output: Contribution to journalArticle

Abstract

Local field potentials (LFPs) recorded through electrodes implanted in patients with Parkinson's disease (PD) for deep brain stimulation (DBS) provided physiological information about the human basal ganglia. However, LFPs were always recorded 2-7 days after electrode implantation ("acute" condition). Because changes in the tissue surrounding the electrode occur after DBS surgery and could be relevant for LFPs, in this work we assessed whether impedance and LFP pattern are a function of the time interval between the electrode implant and the recordings. LFPs and impedances were recorded from 11 patients with PD immediately after (T-0h), 2 h after (T-2h), 2 days after (T-48h), and 1 month after (T-30d, "chronic" condition) surgery. Impedances at T-0h were significantly higher than at all the other time intervals (T-2h, p = 0.0005; T-48h, p = 0.0002; T-30d, p = 0.003). Correlated with this change (p = 0.005), the low-frequency band (2-7 Hz) decreased at all time intervals (p = 0.0005). Conversely, the low- (8-20 Hz) and the high-beta (21-35 Hz) bands increased in time (low-beta, p = 0.003; high beta, p = 0.022), but did not change between T-48h and T-30d. Our results suggest that DBS electrode impedance and LFP pattern are a function of the time interval between electrode implant and LFP recordings. Impedance decrease could be related to changes in the electrode/tissue interface and in the low-frequency band. Conversely, beta band modulations could raise from the adaptation of the neural circuit. These findings confirm that results from LFP analysis in the acute condition can be extended to the chronic condition and that LFPs can be used in novel closed-loop DBS systems.

Original languageEnglish
Pages (from-to)184-190
Number of pages7
JournalExperimental Neurology
Volume222
Issue number2
DOIs
Publication statusPublished - Apr 2010

Keywords

  • Deep Brain Stimulation
  • Electrode/tissue interface
  • Impedance
  • Local Field Potentials
  • Parkinson's disease
  • Subthalamic Nucleus

ASJC Scopus subject areas

  • Neurology
  • Developmental Neuroscience

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