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Related Experiment Videos

Forebrain rhythm generators influence sympathetic activity in anesthetized cats.

M J Kenney1, G L Gebber, S M Barman

  • 1Department of Pharmacology, Michigan State University, East Lansing 48824.

The American Journal of Physiology
|September 1, 1990
PubMed
Summary

Brain activity (EEG) influences sympathetic nerve discharge (SND) through delta waves, particularly in cats anesthetized with alpha-chloralose. This connection is modulated by sleep-wake cycle mechanisms.

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Area of Science:

  • Neuroscience
  • Autonomic Nervous System Research
  • Cardiovascular Physiology

Background:

  • The relationship between central nervous system activity and autonomic control is complex.
  • Sympathetic nerve discharge (SND) plays a crucial role in cardiovascular regulation.
  • Understanding the neural pathways linking brain activity to sympathetic outflow is essential.

Purpose of the Study:

  • To investigate the frequency-domain relationship between frontal-parietal cortical electroencephalogram (EEG) activity and sympathetic nerve discharge (SND).
  • To explore the influence of anesthetic agents (alpha-chloralose vs. pentobarbital sodium) on this relationship.
  • To determine the role of descending forebrain influences and potential gating mechanisms in this neuro-autonomic coupling.

Main Methods:

Related Experiment Videos

  • Autospectral and coherence analyses were applied to EEG and sympathetic nerve discharge (SND) recordings in baroreceptor-denervated and vagotomized cats.
  • Experiments were conducted under two different anesthetic conditions: alpha-chloralose and pentobarbital sodium.
  • Midbrain transection was performed to assess the origin of descending influences.

Main Results:

  • A significant correlation was found between delta slow-wave activity (0.5–4 Hz) in the EEG and SND, indicated by coherence peaks.
  • This EEG-SND relationship was more pronounced in alpha-chloralose-anesthetized cats compared to pentobarbital-anesthetized cats.
  • Midbrain transection reduced SND power at coherent frequencies but spared EEG power, suggesting descending forebrain control.
  • The EEG-SND coupling was stronger during cortical spindle-like events, resembling sleep spindles.

Conclusions:

  • Forebrain delta slow-wave generators exert descending influences on sympathetic circuits.
  • These influences on SND appear to be gated by thalamic mechanisms involved in the sleep-wake cycle.
  • Anesthetic choice significantly impacts the strength of the neuro-autonomic coupling between cortical activity and sympathetic nerve discharge.