NCIt definition : The use of anesthetics in the central or peripheral nervous system to diminish or
eliminate the bombardment of the CNS with nociceptive input, which minimizes stress
response, adverse spinal reflexes, and wind-up. It may be performed for temporary
or permanent pain palliation. (from Rowlingson);
Alternative definition : NCI-GLOSS: A procedure in which medicine is injected directly into or around a nerve
or into the spine to block pain.;