[Complex regional pain syndrome].

Complex regional pain syndrome is a clinical entity that usually occurs following trauma, surgery, or other triggering event. Patients complain of pain described as burning, associated with sensory, vasomotor, sudomotor, motor and/or trophic disorders. The pain appears disproportionate to the initial lesion. The diagnosis is purely clinical and based on the Budapest criteria. It is a diagnosis of exclusion. The pathophysiology is still poorly understood and is thought to be multifactorial. Several mechanisms have been described: an inflammatory state, an overactivation of the sympathetic autonomic nervous system and a poor perception of pain at the central level. The management of signs and symptoms is therefore global. It involves physiotherapy and occupational therapy, often combined with analgesic medications. Psychological treatment may be proposed in certain circumstances. The natural evolution is rather favourable.