Articles: hyperalgesia.
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Experimental neurology · Oct 2012
Meteorin reverses hypersensitivity in rat models of neuropathic pain.
Neuropathic pain is caused by a lesion or disease to the somatosensory nervous system and current treatment merely reduces symptoms. Here, we investigate the potential therapeutic effect of the neurotrophic factor Meteorin on multiple signs of neuropathic pain in two distinct rat models. In a first study, two weeks of intermittent systemic administration of recombinant Meteorin led to a dose-dependent reversal of established mechanical and cold hypersensitivity in rats after photochemically-induced sciatic nerve injury. ⋯ This pharmacokinetic profile combined with a delayed time of onset and prolonged duration of analgesic efficacy on multiple parameters suggests a disease-modifying mechanism rather than symptomatic pain relief. In sciatic nerve lesioned rats, delivery of recombinant Meteorin by intrathecal injection was also efficacious in reversing mechanical and cold hypersensitivity. Together, these data demonstrate that Meteorin represents a novel treatment strategy for the effective and long lasting relief from the debilitating consequences of neuropathic pain.
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Randomized Controlled Trial Clinical Trial
Interaction of fentanyl and buprenorphine in an experimental model of pain and central sensitization in human volunteers.
: There is controversy about combining opioids with different receptor affinities. We assessed the analgesic and antihyperalgesic effects of the μ-agonist fentanyl and the partial μ-agonist/κ-antagonist buprenorphine in a human pain model, when given alone or in combination. ⋯ : For the doses administered in this study, buprenorphine and fentanyl showed an additive interaction.
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Review
Cold hyperalgesia as a prognostic factor in whiplash associated disorders: a systematic review.
To review and critically evaluate the existing literature for the prognostic value of cold hyperalgesia in Whiplash Associated Disorders (WAD). ⋯ There is moderate evidence supporting cold hyperalgesia as a prognostic factor for long-term pain and disability outcome in WAD. Further validation of the strength of this relationship and the influence of covariates are required. The mechanism for this relationship is unknown.
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We describe a child with polyarticular juvenile idiopathic arthritis (JIA) presenting with severe diffuse pain refractory to nonsteroidal anti-inflammatory agents and high-dose opioids. Her JIA involved her knees and ankles and was mildly active on etanercept and nonsteroidal anti-inflammatory agents. At presentation, she complained of hip pain progressing to severe diffuse pain and allodynia involving her extremities. ⋯ Despite reports in adults, the phenomenon of OIH has been reported infrequently in children. To our knowledge, OIH has not been described in children with rheumatologic conditions. We recommend investigating the possibility of OIH when treating a child with JIA and severe refractory pain.