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Changes in the complex permittivity during spreading depression in rat cortex.

R S Yoon1, A Czaya, H C Kwan

  • 1Department of Electrical and Computer Engineering, University of Toronto, Ont., Canada. ryoon@ecf.utoronto.ca

IEEE Transactions on Bio-Medical Engineering
|December 3, 1999
PubMed
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Current density imaging (CDI) can assess brain tissue conductivity changes during spreading depression (SD). A novel, short-latency conductivity change was observed, suggesting a new mechanism for ischemia and migraine research.

Area of Science:

  • Neuroscience
  • Biophysics
  • Medical Imaging

Background:

  • Current density imaging (CDI) is a developing technique with potential for brain imaging.
  • CDI relies on activity-dependent changes in brain tissue conductivity.
  • Spreading depression (SD) is a relevant model for cerebral ischemia and migraine with aura.

Purpose of the Study:

  • To investigate changes in complex brain tissue conductivity during spreading depression (SD).
  • To evaluate the feasibility of using current density imaging (CDI) for studying SD-related phenomena.

Main Methods:

  • Utilized a coaxial probe to measure complex conductivity changes in rodent neocortex during induced SD.
  • Analyzed conductivity data for latency and magnitude of changes.

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Main Results:

  • Observed conductivity changes during SD with two distinct latencies: a short latency (30-60 s) and a longer latency (200-300 s).
  • The short-latency conductivity change is a novel finding, potentially indicating a pre-SD mechanism.
  • A significant 20% change in conductivity during SD was detected, confirming its measurability by CDI.

Conclusions:

  • CDI is a viable technique for studying brain tissue conductivity changes, particularly during events like SD.
  • The detected short-latency conductivity change offers new insights into the pathophysiology of spreading depression.
  • CDI's ability to measure conductivity changes, distinct from metabolic changes, enhances its utility for researching ischemia and migraine with aura.