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Helium effect on isolated nerve activity.

D M Ritchie, J R DiPalma, R F McMichael

    Archives Internationales De Pharmacodynamie Et De Therapie
    |January 1, 1978
    PubMed
    Summary
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    Noble gases like nitrogen, argon, and helium can exhibit anesthetic properties. Helium, particularly in desheathed frog sciatic nerves, showed effects comparable to lidocaine, suggesting potential anesthetic capabilities with prolonged exposure.

    Area of Science:

    • Neuroscience
    • Anesthesiology
    • Biophysics

    Background:

    • Nerve conduction is crucial for physiological function.
    • Understanding the effects of various gases on nerve activity is important for anesthesiology and neuroscience.
    • The sciatic nerve is a common model for studying nerve physiology.

    Purpose of the Study:

    • To investigate the anesthetic effects of different gases on isolated frog sciatic nerves.
    • To compare the effects in both sheathed and desheathed nerve preparations.
    • To explore the potential anesthetic properties of helium.

    Main Methods:

    • Isolated frog sciatic nerves were used.
    • Action potential amplitudes were recorded.
    • Gases including nitrogen, argon, and helium were administered to sheathed and desheathed preparations.

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    Main Results:

    • Nitrogen and argon demonstrated significant anesthetic effects in the sheathed nerve preparation.
    • Helium also depressed action potential amplitude in the desheathed nerve preparation.
    • Helium's effect in the desheathed nerve was comparable to 10(-6) M lidocaine.

    Conclusions:

    • Certain noble gases possess anesthetic properties affecting nerve action potentials.
    • Helium exhibits anesthetic effects on frog sciatic nerves, particularly when desheathed.
    • Prolonged helium exposure may lead to significant anesthetic properties, warranting further investigation.