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Introduction: Multiple mechanisms are involved in the development and persistence of neuropathic pain. Some patients with nerve damage will remain painless and develop a "loss of function" phenotype, whereas others develop painful neuropathies.
Objectives: The aim of this study is to investigate the role of a peripheral nervous system sensitization by analyzing patients with and without pain.
Methods: The topical application of capsaicin was investigated in peripheral nociceptors. Two groups of patients (painful vs painless) with length-dependent neuropathies and small-fiber impairment were tested. Quantitative sensory testing was assessed before and after topical application of 0.6% capsaicin in the affected skin. In addition, blood perfusion measurements and an axon reflex flare assessment were performed.
Results: Quantitative testing revealed that heat hyperalgesia was induced in all patients and volunteers ( < 0.01) without observing any significant differences between patient groups. By contrast, the extent of the axon reflex flare reaction ( < 0.01) as well as the blood perfusion ( < 0.05) was significantly greater in patients with pain than in neuropathy patients not experiencing pain.
Conclusion: Hyperexcitable vasoactive nociceptive C fibers might contribute to pain in peripheral neuropathies and therefore may serve as a key player in separating into a painless or painful condition.
Download full-text PDF |
Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6370139 | PMC |
http://dx.doi.org/10.1097/PR9.0000000000000709 | DOI Listing |
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