Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0184567 (acute pain)
 3,962 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

"Responder" Sprague-Dawley (SD) rats that were sensitive to electroacupuncture (EA) in an acute thermal pain test (i.e. tail flick latency [TFL] test) maintained sensitivity to EA in the warm allodynia test after peripheral nerve injury. Similarly, the "non-responder" SD rats that were insensitive to EA in the TFL test were also insensitive to EA in the allodynia test. The EA-induced analgesic effects in the TFL test were significantly higher in CCK-A receptor deficient, Otsuka Long-Evans Tokushima Fatty (OLETF) rats than in their littermates, Long-Evans Tokushima Otsuka (LETO) rats. Similarly, the anti-allodynic effects of EA were significantly greater in OLETF rats than in LETO rats. These results suggest that the individual differences in the sensitivity of acute pain behavior to EA were maintained in neuropathic pain behavior following peripheral nerve injury, and that CCK-A receptor expression plays an important role in mediating this phenomenon.
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PMID:The maintenance of individual differences in the sensitivity of acute and neuropathic pain behaviors to electroacupuncture in rats. 1784 10

Human chronic pain sufferers frequently report problems with attention and concentration that affect daily functioning and quality of life. Chronic pain is also commonly associated with anxiety and depression. It is currently not known if the pain causes these co-morbidities, or if they are pre-disposing risk factors for the development of chronic pain. Animal studies suggest a possible causative effect of pain on cognition, but usually tests are conducted during acute ongoing pain when the pain may act as a distracter to normal cognitive and emotional processing. Here we examine long-term effects of nerve injury on cognitive functioning in a rat model, which contributes to better understanding of the relationship between cognitive impairment and chronic pain experience in human populations. This study investigated attentional capability, anxiety-like behavior and sensory functioning 6 months after spared nerve injury (SNI) surgery-a time-point well beyond the acute pain phase and akin to decades of pain experience in humans. Male Long Evans rats subjected to nerve injury remained hypersensitive to sensory stimuli from the time of injury to the 6-month post-injury assessment. At 6 months they were impaired on a visual non-selective, non-sustained attention task and displayed anxiety-like behaviors in the elevated plus maze. These findings show that cognitive disturbances observed during acute pain persist for months in a rodent chronic pain model and suggest that cognitive alterations in chronic pain patients are at least partially caused by the chronic pain state.
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PMID:Nerve injury causes long-term attentional deficits in rats. 2299 28

Acute pain is a common complication after injury of a peripheral nerve but the underlying mechanism is obscure. We established a model of acute neuropathic pain via pulling a pre-implanted suture loop to transect a peripheral nerve in awake rats. The tibial (both muscular and cutaneous), gastrocnemius-soleus (muscular only), and sural nerves (cutaneous only) were each transected. Transection of the tibial and gastrocnemius-soleus nerves, but not the sural nerve immediately evoked spontaneous pain and mechanical allodynia in the skin territories innervated by the adjacent intact nerves. Evans blue extravasation and cutaneous temperature of the intact skin territory were also significantly increased. In vivo electrophysiological recordings revealed that injury of a muscular nerve induced mechanical hypersensitivity and spontaneous activity in the nociceptive C-neurons in adjacent intact nerves. Our results indicate that injury of a muscular nerve, but not a cutaneous nerve, drives acute neuropathic pain.
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PMID:Injury of Muscular but not Cutaneous Nerve Drives Acute Neuropathic Pain in Rats. 3193 63