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Journal Article
Research Support, Non-U.S. Gov't
Symptom duration and clinical features in painful sensory neuropathy with and without nerve conduction abnormalities.
Journal of the Neurological Sciences 2003 October 16
BACKGROUND: The term "small fiber sensory neuropathy" (SFSN) refers to an axonal sensory polyneuropathy predominantly affecting cutaneous sensory modalities, often associated with pain and with no evidence of large fiber involvement. We hypothesized that, in most patients, SFSN is the earliest manifestation of a nonspecific axonal neuropathy and will usually progress to involve larger, heavily myelinated sensory and motor fibers. We sought indirect evidence of this through an analysis of the correlation between symptom duration and large fiber involvement in patients with painful sensory neuropathy (PSN).
METHODS: A clinical diagnosis of PSN was supported by nerve conduction studies or measurement of epidermal nerve fiber (ENF) density in 43 patients. Symptom duration was correlated with the frequency of large fiber loss as measured by nerve conduction abnormalities. The severity and extent of clinical signs and symptoms were also evaluated in subjects with and without electrodiagnostic abnormalities.
RESULTS: Patients with large sensory axon involvement had symptoms of longer duration than patients with SFSN. The frequency of electrodiagnostic abnormalities increased in direct proportion to disease duration. Patients with electrodiagnostic abnormalities also had more extensive pinprick sensory deficits, suggesting that small fiber loss was more advanced in this group as well.
CONCLUSIONS: In PSN, the incidence of large fiber involvement appears to increase in proportion to symptom duration. This represents indirect evidence that SFSN usually progresses to involve both large and small fibers within 2-10 years.
METHODS: A clinical diagnosis of PSN was supported by nerve conduction studies or measurement of epidermal nerve fiber (ENF) density in 43 patients. Symptom duration was correlated with the frequency of large fiber loss as measured by nerve conduction abnormalities. The severity and extent of clinical signs and symptoms were also evaluated in subjects with and without electrodiagnostic abnormalities.
RESULTS: Patients with large sensory axon involvement had symptoms of longer duration than patients with SFSN. The frequency of electrodiagnostic abnormalities increased in direct proportion to disease duration. Patients with electrodiagnostic abnormalities also had more extensive pinprick sensory deficits, suggesting that small fiber loss was more advanced in this group as well.
CONCLUSIONS: In PSN, the incidence of large fiber involvement appears to increase in proportion to symptom duration. This represents indirect evidence that SFSN usually progresses to involve both large and small fibers within 2-10 years.
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