Articles: hyperalgesia.
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Randomized Controlled Trial
Evaluation of antihyperalgesic and analgesic effects of 35% nitrous oxide when combined with remifentanil: A randomised phase 1 trial in volunteers.
Remifentanil is an effective drug in peri-operative pain therapy, but it can also induce and aggravate hyperalgesia. Supplemental administration of N2O may help to reduce remifentanil-induced hyperalgesia. ⋯ Administration of 35% N2O significantly reduced hyperalgesia, allodynia and pain intensity induced after remifentanil. It might therefore be suitable in peri-operative pain relief characterised by hyperalgesia and allodynia, such as postoperative pain, and may help to reduce opioid demand.
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Pulsed radiofrequency (PRF) treatment uses low energy, short pulsations to modulate tissue characteristics. PRF treatment has been effective as an interventional pain management technique to treat a variety of chronic neuropathic pain (neuralgia) disorders, but a comprehensive review of its biological mechanism has not been updated in a decade. ⋯ Herein describes a clinically relevant collated update describing the cellular and molecular mechanisms of action of PRF for pain management.
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Peak alpha frequency (PAF) reduces during cutaneous pain, but no studies have investigated PAF during movement-related muscle pain. Whether high-pain sensitive (HPS) individuals exhibit a more pronounced PAF response to pain than low-pain sensitive (LPS) individuals is unclear. As a pain model, twenty-four participants received nerve growth factor injections into a wrist extensor muscle at Day 0, Day 2, and Day 4. ⋯ Pain NRS-scores were associated with PAF during Contraction-state at Day 4 and Day 6 (P < .05). PERSPECTIVE: PAF was slowed during long-lasting movement-related pain in both groups, suggesting a widespread change in cortical excitability independent of the pain sensitivity. Moreover, HPS individuals showed faster PAF than LPS individuals during muscle pain, which may reflect a different cognitive, emotional, or attentional response to muscle pain among individuals.
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Current evidence suggests that carpal tunnel syndrome (CTS) involves widespread pressure pain sensitivity as a manifestion of central sensitization. This study aimed to quantify mechanisms driving widespread pressure pain hyperalgesia in CTS by using network analysis. ⋯ This is the first study to apply network analysis to understand the multivariate mechanisms of individuals with CTS. Our findings support a model in which clinical symptoms, depression, and widespread pressure pain sensitivity are connected, albeit within separate clusters. The clinical implications of the present findings, such as the development of treatments targeting these mechanisms, are also discussed.
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Postoperative pain management has increasingly become a public health problem worldwide. Psychological factors can be considered as independent risk factors for the intensity of postoperative pain and the occurrence of postoperative chronic pain. ⋯ These findings suggest that chronic restraint stress may influence postoperative hyperalgesia and NLRP3-mediated neuroinflammation, which may in turn contribute to stress-induced postoperative pain exacerbation.