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“ObjectiveThe predelivery of intravenous alfentanil (a &mgr; opioid agonist) and ketamine (an N-methyl d-aspartate antagonist) has recently been shown to decrease the secondary hyperalgesia induced by intradermal capsaicin.”
“Subanaesthetic doses of ketamine specifically reduce primary and secondary hyperalgesia after capsaicin or burn injury (9-11), and also reduce temporal summation of pain (8,12) and postoperative hyperalgesia (13).”