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Related Experiment Videos

Halothane augments event-related gamma oscillations in rat visual cortex.

O A Imas1, K M Ropella, J D Wood

  • 1Department of Anesthesiology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.

Neuroscience
|December 12, 2003
PubMed
Summary

General anesthesia with halothane does not abolish cortical gamma oscillations, even at deep levels. Gamma power peaks at concentrations causing loss of consciousness, suggesting it

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Area of Science:

  • Neuroscience
  • Anesthesiology
  • Computational Neuroscience

Background:

  • Cortical gamma oscillations (20-60 Hz) are linked to cognition and consciousness.
  • The impact of general anesthesia on gamma oscillations remains controversial.
  • Previous studies may underestimate gamma power due to signal averaging methods.

Purpose of the Study:

  • To investigate the concentration-dependent effects of halothane on gamma oscillations in rat primary visual cortex.
  • To differentiate between evoked (phase-locked) and induced (non-phase-locked) gamma activity.
  • To correlate gamma power changes with the loss of righting reflex during anesthesia.

Main Methods:

  • Recorded event-related potentials (ERPs) to light flashes in rat primary visual cortex using chronically implanted electrodes.

Related Experiment Videos

  • Administered varying steady-state concentrations of halothane (0-2%).
  • Analyzed gamma-band power (20-60 Hz) using multitaper spectral analysis on single-trial and averaged ERPs.

    • Main Results:

    • Significant prestimulus gamma power was observed across all halothane concentrations.
    • Flash stimulation increased gamma power up to 1 second poststimulus at all concentrations.
    • Intermediate halothane concentrations (0.5-1.2%) augmented gamma power 2-4 times; power was similar in waking and deeply anesthetized states.
    • Maximum gamma power occurred at 0.86% halothane, near the concentration (0.73%) causing loss of righting reflex.
    • Evoked gamma power was present in the first 300 ms, while induced gamma power persisted longer.
    • Single-trial analysis revealed higher gamma power than ERP averaging, especially at later time points.

    Conclusions:

    • Gamma activity persists from waking to deep halothane anesthesia.
    • Halothane does not block visual input to the striate cortex even at surgical anesthetic planes.
    • Anesthetic-induced loss of consciousness is not directly correlated with a reduction in gamma power.