• Curr Opin Neurol Neurosurg · Apr 1993

    Review

    The spinal pharmacology of facilitation of afferent processing evoked by high-threshold afferent input of the postinjury pain state.

    • T L Yaksh.
    • Department of Anesthesiology, University of California, San Diego, La Jolla 92093.
    • Curr Opin Neurol Neurosurg. 1993 Apr 1;6(2):250-6.

    AbstractRepetitive C afferent input evokes a facilitated state of processing that results in increased receptive fields and exaggerated responses to afferent input ("wind-up"). These phenomena underlie the behavioral phenomena of secondary hyperalgesia and this in turn is an important component of postoperative pain. The initiation of this facilitated component is not well blocked by even higher concentrations of volatile anesthetics, but it can be prevented by pretreatment with agents known to block afferent input (local anesthetics) or C-fiber transmitter release (opiates) or to act at one of several links to block a complex spinal cascade involving the N-methyl-D-aspartate receptor, nitric oxide synthase, and cyclooxygenase. These fundamental mechanisms promise to have an impact on the management of postoperative pain.

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