British Journal of Anaesthesia, Vol 83, Issue 4 662-664, Copyright © 1999 by The Board of Management and Trustees of the British Journal of Anaesthesia
J. De Lima, D. Alvares, D. J. Hatch and M. Fitzgerald
The response to tissue injury includes sensitization of peripheral
nociceptors and central neuronal pathways leading to acute clinical and
inflammatory pain. A further response is sprouting of sensory nerve
terminals in the region of skin damage. This hyperinnervation response is
particularly intense in neonates compared with adults. In this study, we
tested the effect of regional nerve block at the time of injury on skin
hyperinnervation. Anaesthetized newborn rat pups were treated with
percutaneous sciatic nerve block injections of 0.25% bupivacaine 25
microliters followed by a localized hindpaw skin wound. Cutaneous
innervation was studied by image analysis of immunostained skin sections, 7
days after wounding, and sensory thresholds were assessed using von Frey
hairs. The results showed that both hyperinnervation and hypersensitivity
were not significantly altered by the application of a regional nerve block
at the time of injury. This suggests that regional analgesia, used commonly
in clinical practice, is unlikely to prevent the hyperinnervation that
follows skin wounding.
SHORT COMMUNICATIONS
Sensory hyperinnervation after neonatal skin wounding: effect of bupivacaine sciatic nerve block
Portex Department of Anaesthesia, Guilford Street, London WC1N 3EH, UK; Department of Anatomy and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK
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