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Can complex regional pain syndrome be painless?
1Pain Relief Unit, Rambam Medical Center, Technion-Israel Institute of Technology, P.O. Box 9602, Haifa 31096, Israel Department of Orthopedic Surgery B, Rambam Medical Center, Technion-Israel Institute of Technology, Haifa 31096, Israel.
Pain
|December 9, 2003
Summary
Complex Regional Pain Syndrome (CRPS) typically involves pain, but a new study identifies a variant without pain. This suggests pain is not essential for CRPS maintenance, proposing "complex regional painless syndrome."
Area of Science:
- Neurology
- Pain Medicine
- Autonomic Nervous System Research
Background:
- Complex Regional Pain Syndrome (CRPS), also known as reflex sympathetic dystrophy, is characterized by pain, autonomic dysfunction, motor deficits, and trophic changes.
- The pathogenesis of CRPS is not fully understood, but neurogenic inflammation involving neural nociceptive tissue is a leading hypothesis.
Observation:
- A cohort of patients presented with all clinical hallmarks of CRPS, including autonomic abnormalities, motor dysfunction, and trophic changes.
- Crucially, these patients exhibited no pain, neither spontaneous nor stimulus-evoked.
Findings:
- The absence of pain in these CRPS patients challenges the traditional view that pain is a necessary diagnostic criterion.
- This indicates that CRPS can manifest and be maintained without the presence of pain.
Implications:
- The findings necessitate a re-evaluation of CRPS diagnostic criteria and understanding of its pathophysiology.
- The proposed term 'complex regional painless syndrome' (CRPS-P) may help in identifying and managing this distinct clinical entity.
- Further research into CRPS-P could elucidate alternative pathways in CRPS pathogenesis beyond pain signaling.