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Bruehl S et al. – This case report presents data regarding endogenous opioid analgesia in a healthy female subject prior to developing chronic pain, and again 4 and 13 months following onset of chronic daily back pain. At each assessment period, the subject underwent identical protocols involving two sessions one week apart with randomized double–blind crossover administration of saline placebo and naloxone, an opioid antagonist. Each session included a 5–min anger recall interview, followed by finger pressure and ischemic acute pain tasks. Increases in acute pain ratings induced by opioid blockade were interpreted as reflecting endogenous opioid analgesia. When the subject was healthy and pain–free, naloxone produced a mean overall 16% decrease in pain ratings relative to placebo. However, 4months after onset of chronic pain, a mean naloxone–induced increase of 22% in pain ratings over placebo was observed, consistent with presence of endogenous opioid analgesia...Although results must be interpreted cautiously, findings are consistent with the hypothesis that chronic pain may initially be associated with upregulation of endogenous opioid analgesic systems which then may become dysfunctional over time.

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