Abstract
Previous studies by our laboratory established a rat model of neuropathic pain which displayed long-lasting heat hyperalgesia and mechanical allodynia that are sympathetically maintained. The present study was undertaken to extend our earlier findings by examining additional behavioral signs of ongoing pain and cold allodynia in our animal model and testing their sympathetic dependency. Neuropathic surgery was done by tightly ligating the L5 and L6 segmental spinal nerves of rats unilaterally. In addition to the behavioral signs of heat hyperalgesia and mechanical allodynia observed before, these rats displayed signs of ongoing pain (lasting at least 10 weeks) and cold allodynia (lasting at least 16 weeks). These behaviors were reduced markedly after surgical lumbar sympathectomy. The results of the present study, together with the previous study, suggest that our animal model exhibits neuropathic pain behaviors including ongoing pain, heat hyperalgesia, mechanical allodynia and cold allodynia. Since all of these behavioral signs are sympathetically maintained, our model represents a model for sympathetically maintained pain.
| Original language | English |
|---|---|
| Pages (from-to) | 369-376 |
| Number of pages | 8 |
| Journal | Pain |
| Volume | 59 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1994 Dec |
Bibliographical note
Funding Information:This work was supportedb y NIH Grants NS 31680 and NS 11255.H .S. Na was supportedi n part by the Kil Chung Hee Fehowship Fund. We wish to thank Margie Watson and Sue Sun Yom for editorial help.
Keywords
- Causalgia
- Hyperalgesia
- Mechanical allodynia
- Peripheral nerve injury
- Sympathetically maintained pain
ASJC Scopus subject areas
- Neurology
- Clinical Neurology
- Anesthesiology and Pain Medicine