Intracerebral microdialysis during deep brain stimulation surgery

Michaux Kilpatrick, Ephraim W. Church, Shabbar Danish, Michael Stiefel, Jurg Jaggi, Casey Halpern, Marie Kerr, Eileen Maloney, Michael Robinson, Irwin Lucki, Elizabeth Krizman-Grenda, Gordon Baltuch

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Background: This report describes the use of microdialysis in conjunction with deep brain stimulation (DBS) surgery to assess extracellular levels of neurotransmitters within the human basal ganglia (BG). Electrical stimulation of the subthalamic nucleus (STN) is an efficacious treatment for advanced Parkinson's disease, yet the mechanisms of STN DBS remain poorly understood. Measurement of neurotransmitter levels within the BG may provide insight into mechanisms of DBS, but such an approach presents technical challenges.Methods: After microelectrode recordings confirmed location of STN, a custom microdialysis guide cannula was inserted. A CMA (Stockholm, Sweden) microdialysis probe was then positioned to the same depth as the microrecording electrode in STN or 2. mm inferiorly to record in the substantia nigra. The catheter was perfused at a rate of 2.0. μL/min with a sterile mock CSF solution and samples of extracellular fluid were collected at regular intervals. Dialysate samples were analyzed using high-pressure liquid chromatography (HPLC) detection procedures for quantitation of glutamate, gamma-aminobutyric acid (GABA), and dopamine.Results: Levels of neurotransmitters were reliably identified in dialysate samples using HPLC. By monitoring concentrations of glutamate, GABA and dopamine, we were able to demonstrate what seemed to be a steady state baseline within approximately 30. min.Conclusion: Microdialysis during DBS surgery is a feasible method for assessing levels of glutamate, GABA and dopamine within the human BG. Obtaining a steady state baseline of neurotransmitter levels appears feasible, thus making future studies of intraoperative microdialysis during DBS meaningful.

Original languageEnglish (US)
Pages (from-to)106-111
Number of pages6
JournalJournal of Neuroscience Methods
Volume190
Issue number1
DOIs
StatePublished - Jun 2010

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

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