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Peripheral nerve injection injury: an experimental study.

F Gentili, A Hudson, D G Kline

    Neurosurgery
    |March 1, 1979
    PubMed
    Summary
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    Drug injections into nerves can cause varying degrees of injury. Intrafascicular injections and certain medications like penicillin caused severe sciatic nerve damage in rats, though nerves showed regenerative capacity.

    Area of Science:

    • Neuroscience
    • Toxicology
    • Histology

    Background:

    • Medications administered via intramuscular injection can inadvertently affect nerves.
    • Understanding the potential for nerve injury from accidental injection is crucial for patient safety.

    Purpose of the Study:

    • To evaluate the neurotoxic effects of commonly injected agents on rat sciatic nerves.
    • To determine the influence of injection site (intrafascicular vs. extrafascicular) and drug properties on nerve damage.

    Main Methods:

    • Adult Wistar rats received injections of 11 agents or saline into sciatic nerves.
    • Nerves were examined using light and electron microscopy, with myelinated nerve fiber counts and motor function assessments.
    • Injections were categorized as intrafascicular or extrafascicular, and drug quantities were varied.

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    Main Results:

    • Significant variation in nerve injury severity was observed among the tested agents.
    • Penicillin, diazepam, and chlorpromazine caused maximal nerve injury, while iron-dextran, meperidine, and cephalothin caused minimal damage.
    • Intrafascicular injections consistently resulted in severe injury, whereas extrafascicular injections caused minimal damage. Larger, heavily myelinated fibers were more susceptible.

    Conclusions:

    • The neurotoxic potential of injected agents varies significantly.
    • Injection site is a critical factor, with intrafascicular delivery posing the highest risk.
    • Nerve regeneration occurs even after severe injury, suggesting potential for recovery.