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Related Experiment Videos

Experimental ischemic neuropathy: salvage with hyperbaric oxygenation

M Kihara1, P G McManis, J D Schmelzer

  • 1Department of Neurology, Mayo Foundation, Rochester, MN 55905.

Annals of Neurology
|January 1, 1995
PubMed
Summary

Hyperbaric oxygenation effectively rescues peripheral nerves from ischemic fiber degeneration when ischemia is not extreme. This treatment improved nerve function and histology in rats with moderate microembolization.

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Biomedical Engineering

Background:

  • Peripheral nerve damage from ischemia can lead to significant functional loss.
  • Hyperbaric oxygenation (HBO) enhances tissue oxygen delivery but can induce oxidative stress.
  • Improving salvage of ischemic peripheral nerves is crucial for functional recovery.

Purpose of the Study:

  • To evaluate if hyperbaric oxygenation can rescue peripheral nerves from ischemic fiber degeneration caused by microembolization.
  • To assess the efficacy of HBO in mitigating nerve damage under controlled ischemic conditions.

Main Methods:

  • Rat sciatic nerves were subjected to microembolization using microspheres at moderate and high doses.
  • Rats received hyperbaric oxygenation (2.5 atm, 100% O2, 2 hours/day for 7 days) or room air.

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  • Outcomes measured included behavioral scores, nerve action potential, nerve blood flow, and histological assessment of fiber degeneration.

    • Main Results:

    • High-dose embolization resulted in severe nerve damage and loss of function, with no difference between HBO and control groups.
    • Moderate-dose embolization showed significant improvements in behavioral scores, nerve action potential, and reduced fiber degeneration in the HBO group compared to controls.
    • Nerve blood flow was comparable between groups with moderate ischemia, indicating HBO's effect on cellular salvage rather than reperfusion.

    Conclusions:

    • Hyperbaric oxygenation effectively rescues peripheral nerve fibers from degeneration when the ischemic insult is moderate.
    • HBO treatment offers a potential therapeutic strategy for peripheral nerve injuries resulting from ischemia, provided the damage is not overwhelmingly severe.
    • Axonal degeneration was the primary pathological finding in the affected nerve fibers.