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Postoperative pain arises largely from distension and sectioning of nerve fibers, which generate a short-lasting but enormous afferent impulse barrage. This causes a long-lasting enlargement of receptive fields and an increase in excitability of dorsal horn neurons sending their axons up to the brain. ⋯ Prostaglandins in the spinal cord facilitate the synaptic transmission from nociceptive afferents. Nonsteroidal anti-inflammatory drugs (NSAIDs) produce relief from postoperative pain by blocking the formation of prostaglandins in the spinal cord, thus abolishing the facilitatory effect of these compounds.