Central dysesthesia pain after traumatic spinal cord injury is dependent on N-methyl-D-aspartate receptor activation

Neurosurgery
P K EideA E Stenehjem

Abstract

The role of central N-methyl-D-aspartate (NMDA) receptors in the pathogenesis of central pain was examined in nine patients with central dysesthesia pain after spinal cord injury. The central pain syndrome included spontaneous continuous and intermittent pain as well as evoked pain. Pain was evoked by non-noxious stimulation of the skin (allodynia) and by repeated pricking of the skin (wind-up-like pain). The severity of continuous and evoked pain was examined before and after the intravenous infusion of either the NMDA receptor antagonist ketamine (6 micrograms/kg/min after a bolus dose of 60 micrograms/kg), the mu-opioid receptor agonist alfentanil (0.6 microgram/kg/min after after a bolus dose of 7 micrograms/kg), or placebo (0.9% NaCl). A randomized, double-blind, crossover study design was used. It was found that both continuous and evoked pain were markedly reduced by the blockade of NMDA receptors by ketamine as well as by the activation of mu-opioid receptors by alfentanil. Neither ketamine nor alfentanil significantly changed thresholds for the sensation of heat pain. The reduction of pain was not associated with severe side effects; the most severe side effect of ketamine was bothersome dizziness in one patient, and o...Continue Reading

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