Remember that a tremendous amount of modulation of incoming pain signals occurs in the dorsal horn side the spinal cord prior to clonidine mechanism sent to higher centers in the CNS. Nociceptive stimuli will promote release of excitatory transmitters from primary afferents side the dorsal horn.
This action pain left clonidine mechanism of action pain left side part of the story, however, as cholinergic activation in the dorsal horn has also been shown to impart analgesia, and clonidine has been shown to increase ACh read more in lumbar CSF. Clonidine also potentiates sensory and motor blockade of epidural and source nerve block administered local anesthetics.
Three mechanisms for this have been given.
Second, clonidine may cause local vasoconstriction and thus impair vascular removal of epidural local anesthetics, although this probably does not occur significantly at clinically-used concentrations.
Third, it has been shown that any analgesic, whether neuraxial or systemic, will augment peripheral or spinal blockade.
Clonidine also enhances neuraxial opioids, with epidural clonidine and fentanyl interacting in an additive manner. Sources Eisenach J et al. For the most updated list of ABA Keywords and definitions go to https:
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