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Related Experiment Videos

Increased axonal excitability during exposure to hyperbaric oxygen.

N Bitterman1, Y Grossman

  • 1Israel Naval Hyperbaric Institute, Haifa.

Canadian Journal of Physiology and Pharmacology
|October 1, 1987
PubMed
Summary

High oxygen pressure enhances nerve cell excitability in cockroaches. This study observed increased action potential firing and changes in axonal properties under hyperbaric conditions, suggesting a link to oxygen-induced seizures.

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Area of Science:

  • Neuroscience
  • Physiology
  • Toxicology

Background:

  • High oxygen pressure can affect nervous system function.
  • Understanding these effects is crucial for diving and anesthesia.
  • The cockroach giant axon serves as a model for neural studies.

Purpose of the Study:

  • To investigate the impact of hyperbaric oxygen on neural function.
  • To quantify changes in axonal excitability under high oxygen pressure.
  • To explore the relationship between oxygen pressure and neural hyperexcitability.

Main Methods:

  • Isolated cockroach nervous system preparation.
  • Recording of intracellular and extracellular action potentials from giant axons.
  • Measurement of axonal excitability using stimulus strength-duration relationships.

Related Experiment Videos

  • Exposure to 7 ATA of oxygen.

    • Main Results:

    • A transient increase in rheobase current was observed initially.
    • A significant decline in rheobase current to 75% of air control values occurred.
    • A parallel increase in the membrane time constant was noted.
    • Hyperbaric oxygen exposure led to increased axonal excitability.

    Conclusions:

    • Hyperbaric oxygenation increases axonal excitability.
    • Observed changes are consistent with epileptogenic effects of high oxygen.
    • The cockroach model provides insights into oxygen toxicity mechanisms.