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Complex regional pain syndrome (CRPS), also called reflex sympathetic dystrophy syndrome and causalgia, is a chronic pain condition in which high levels of nerve impulses are sent to an affected site. Experts believe that CRPS occurs as a result of dysfunction in the central or peripheral nervous systems. CRPS is most common in people aged 20-35. The syndrome also can occur in children; it affects women more often than men.
In cases of injury-related CRPS, the syndrome may be caused by a triggering of the immune response which may lead to the inflammatory symptoms of redness, warmth, and swelling in the affected area. For this reason, it is believed that CRPS may represent a disruption of the healing process. American researchers have suggested a new set of criteria offering acceptable sensitivity and high specificity. However, non-American CRPS patients present distinct subsets of CRPS-related signs/symptoms from those of American patients. Here, we followed a series of American studies to develop a set of CRPS diagnostic criteria that would be most suitable for the Japanese population One symptom of CRPS is continuous, intense pain that gets worse rather than better over time. If CRPS occurs after an injury, it may seem out of proportion to the severity of the injury.
Therapies used include psychotherapy, physical therapy, and drug treatment, such as topical analgesics, narcotics, corticosteroids, antidepressants and anti-seizure drugs. Other treatments include: Sympathetic nerve blocks, surgical sympathectomy, Intrathecal drug pumps, Spinal cord stimulation.