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High spontaneous activity of C-nociceptors in painful polyneuropathy.

Abstract：

:Polyneuropathy can be linked to chronic pain but also to reduced pain sensitivity. We investigated peripheral C-nociceptors in painful and painless polyneuropathy patients to identify pain-specific changes. Eleven polyneuropathy patients with persistent spontaneous pain and 8 polyneuropathy patients without spontaneous pain were investigated by routine clinical methods. For a specific examination of nociceptor function, action potentials from single C-fibres including 214 C-nociceptors were recorded by microneurography. Patients with and without pain were distinguished by the occurrence of spontaneous activity and mechanical sensitization in C-nociceptors. The mean percentage of C-nociceptors being spontaneously active or mechanically sensitized was significantly higher in patients with pain (mean 40.5% and 14.6%, respectively, P=.02). The difference was mainly due to more spontaneously active mechanoinsensitive C-nociceptors (operationally defined by their mechanical insensitivity and their axonal characteristics) in the pain patients (19 of 56 vs 6 of 43; P=.02). The percentage of sensitized mechanoinsensitive C-nociceptors correlated to the percentage of spontaneously active mechanoinsensitive C-nociceptors (Kendall's tau=.55, P=.004). Moreover, spontaneous activity of mechanoinsensitive C-nociceptors correlated to less pronounced activity-dependent slowing of conduction (Kendall's tau=-.48, P=.009), suggesting that axons were included in the sensitization process. Hyperexcitability in mechanoinsensitive C-nociceptors was significantly higher in patients with polyneuropathy and pain compared to patients with polyneuropathy without pain, while the difference was much less prominent in mechanosensitive (polymodal) C-nociceptors. This hyperexcitability may be a major underlying mechanism for the pain experienced by patients with painful peripheral neuropathy.

journal_name

Pain

journal_title

Pain

authors

Kleggetveit IP,Namer B,Schmidt R,Helås T,Rückel M,Ørstavik K,Schmelz M,Jørum E

doi

10.1016/j.pain.2012.05.017

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

2040-2047

issue

10

eissn

0304-3959

issn

1872-6623

pii

00006396-201210000-00011

journal_volume

153

pub_type

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