Articles: neuralgia.
-
Postherpetic pain persisting one month or longer occurs in 9% to 14% of patients with herpes zoster, diminishing with time. The incidence and duration are directly related to age. The pathologic features have been described but the pathogenesis of postherpetic neuralgia is unknown. ⋯ There is some support for the use of local physical modalities. Neurosurgical procedures are a possibility in failed medical cases. Controlled studies of newer approaches are necessary.
-
By way of literature review, clarifications are made in the terminology employed in discussing the atypical post-traumatic pain syndromes, particularly reflex sympathetic dystrophy (RSD). Causalgia is a form of RSD and is the focus of a case report presented from the files at St. Anne's Hospital-West, Northlake, Illinois.
-
Randomized Controlled Trial Comparative Study Clinical Trial
Iontophoresis of vincristine versus saline in post-herpetic neuralgia. A controlled trial.
Twenty patients with post-herpetic neuralgia (median duration 28.5 months) were randomly allocated to receive transdermal iontophoresis of either vincristine or saline. Although significant improvement in pain by word score and visual analogue scale (P = 0.05) was reported by 6 out of 10 of the vincristine group, none of the patients considered themselves 'cured.' There was no significant change in the saline group. ⋯ The dramatic relief of pain in patients with post-herpetic neuralgia of 3 months or less reported elsewhere was not seen in our group who had pain of a longer duration. This present trial does not confirm the value of vincristine iontophoresis in the treatment of post-herpetic neuralgia of over 6 months duration.
-
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 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.