Reduced heat sensitivity and epidermal nerve fiber immunostaining following single applications of a high-concentration capsaicin patch

Pain
Annika B MalmbergK Bley

Abstract

Capsaicin-containing plant extracts have been used as topical treatments for a variety of pain syndromes for many centuries. Current products containing capsaicin in low concentrations (usually 0.025-0.075% w/w) have shown efficacy against a variety of pain conditions in clinical studies. However, in order to produce significant analgesic effects, these formulations require frequent re-dosing, often as much as three to five times daily for several weeks. Previous functional and immunohistochemical studies following prolonged exposures to low-concentration capsaicin cream suggested that the duration and onset of analgesic efficacy correlate with a reduction of cutaneous nociceptive sensory nerve fiber responsiveness and immunostaining. The purpose of the present study was to determine whether a single topical application of a high-concentration capsaicin-containing (8%w/w) patch for 120 min or less would induce similar effects on cutaneous nociceptive nerve fibers. Seven days following patch application, changes in heat and cold perception thresholds were determined by quantitative sensory testing and punch biopsies were collected to assess epidermal nerve fiber (ENF) immunostaining density at the application site using PGP 9.5 ...Continue Reading

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