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Direct opioid application to peripheral nerves does not alter compound action potentials.

O Yuge, M Matsumoto, L M Kitahata

    Anesthesia and Analgesia
    |July 1, 1985
    PubMed
    Summary
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    Systemic opiates like morphine and fentanyl do not affect nerve conduction in primary afferent fibers. This study found no significant changes in nerve action potentials after drug administration in cats.

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Pain research

    Background:

    • Opiate receptors are present on primary afferent nerve fibers.
    • This suggests opiates might influence nerve fiber conduction.
    • The direct effect of systemic opiates on these fibers is not well understood.

    Purpose of the Study:

    • To investigate the effect of systemically administered opiates on primary afferent nerve conduction.
    • To determine if morphine and fentanyl alter nerve action potentials in superficial radial nerves.

    Main Methods:

    • Experiments were conducted on decerebrate cats (n=18).
    • Preservative-free morphine sulfate (0.1 mg/kg) and fentanyl citrate (25 micrograms/kg) were directly applied.
    • Compound action potentials (A beta, A delta, C components) of the superficial radial nerve were measured.

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    Main Results:

    • Neither morphine nor fentanyl caused significant changes in the area under the curve of any measured compound action potential components.
    • The conduction properties of A beta, A delta, and C fibers remained unaffected.

    Conclusions:

    • Systemic administration of morphine and fentanyl does not appear to alter primary afferent nerve conduction.
    • These findings suggest that systemically administered opiates are unlikely to directly affect nerve conduction in primary afferent fibers.