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On the relationship between nociceptive evoked potentials and intraepidermal nerve fiber density in painful sensory polyneuropathies

Authors
Journal
Pain
0304-3959
Publisher
Ovid Technologies (Wolters Kluwer) - Lippincott Williams & Wilkins
Volume
152
Issue
2
Identifiers
DOI: 10.1016/j.pain.2010.11.012
Keywords
  • Laser-Evoked Potentials
  • Contact Heat-Evoked Potentials
  • Skin Biopsy
  • Small-Fiber Neuropathy
  • Intraepidermal Nerve Fiber Density
  • Axonal Swelling
Disciplines
  • Medicine

Abstract

Abstract This study analyzed the relationship between the density of intraepidermal nerve fibers (IENF) and the characteristics of either nociceptive laser-evoked potentials (LEPs) or contact heat-evoked potentials (CHEPs) in patients with painful sensory polyneuropathy with the aim to determine which parameters of LEPs and CHEPs more reliably reflect IENF loss. A total of 96 patients and 35 healthy volunteers took part in the study. Based on clinical examination, nerve conduction tests, and quantitative sensory testing, we identified 52 patients with small-fiber neuropathy (SFN), 40 with mixed (small-fiber and large-fiber) neuropathy (MFN), and 4 who were excluded from the analysis because of no evidence of involvement of small fibers. The latency of the N2 was delayed for both LEPs and CHEPs in patients with MFN and for CHEPs only in patients with SFN. The amplitude of the vertex N2/P2 potential was similarly reduced in both types of neuropathy, but LEPs were more frequently absent than CHEPs in MFN patients (68% vs 40%). In general, latency and amplitude of LEPs and CHEPs were well correlated with IENF density. SFN patients were characterized by abnormal EPs and slightly decreased but morphologically abnormal IENF. MFN patients were characterized by frequently absent LEPs and CHEPs and a rather severe IENF loss. The correlation between nociceptive evoked potentials (laser-evoked potentials and contact heat-evoked potentials) and skin biopsy aids in the diagnosis of painful neuropathies.

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