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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
REVIEW
A hypothesis on the physiological basis for causalgia and related pains.
Pain 1986 March
A hypothesis is presented concerning the neuronal mechanisms which subserve the sympathetically maintained pains such as causalgia and reflex sympathetic dystrophy. The hypothesis rests on two assumptions: that a high rate of firing in spinal wide-dynamic-range (WDR) or multireceptive neurons results in painful sensations; and that nociceptor responses associated with trauma can produce long-term sensitization of WDR neurons. The hypothesis states that chronic sympathetically maintained pains are mediated by activity in low-threshold, myelinated mechanoreceptors, that this afferent activity results from sympathetic efferent actions upon the receptors or upon afferent fibers ending in a neuroma and that these afferent fibers evoke sufficient activity in sensitized spinal WDR neurons to produce a painful sensation. This hypothesis is based on known characteristics of these neuronal populations studied in experimental animals and on the observed sensory disturbances reported in patients successfully treated with sympathetic blocks. This hypothesis does not require nerve injury or dystrophic tissue. It explains both the continuous pain and the allodynia that are common to these syndromes and their abolition by sympathetic block. Specific changes are proposed in the diagnosis and treatment of post-traumatic pains.
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