Articles: hyperalgesia.
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Chemotherapeutic drugs induce various side effects including painful peripheral neuropathy that represents a major concern. The widely used anticancer drug paclitaxel causes neurological side effects such as burning pain, allodynia, and hyperalgesia. Neuroprotective substances that may effectively counteract paclitaxel-induced neuropathic symptoms are needed. ⋯ PAC-evoked neuropathic symptoms were efficiently reduced after 1 week treatment with GS dilutions 3 or 5C and the beneficial action increased after 2 weeks. GS dilutions, particularly 3C, also counteracted or prevented PAC-induced sciatic nerve axon alterations and decreased the density of intraepidermal nerve fibers. Altogether, these results obtained in the rat preclinical model suggest that GS dilution-based treatment may constitute an interesting option to explore for the long-term management of pain without undesirable effects.
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J Pain Palliat Care Pharmacother · Dec 2018
Case ReportsThe Enigma of Low-Dose Ketamine for Treatment of Opioid-Induced Hyperalgesia in the Setting of Psychosocial Suffering and Cancer-Associated Pain.
Opioid-induced hyperalgesia is a paradoxical adverse effect of opioid therapy with unclear strategies for its treatment and management. We report the successful use of low-dose ketamine infusion for the treatment of opioid-induced hyperalgesia in a 38-year-old woman presenting with psychosocial suffering and high opioid requirement secondary to pain from a poorly differentiated neuroendocrine tumor. Over the course of a month, her opioid requirement escalated to the gram level of oral morphine equivalents, upon which she was hospitalized at University of California San Diego Health for an acute on chronic pain crisis. ⋯ The infusion ultimately allowed reduction of her opioid use to a third of her original daily requirement and improved her function and ability to interact for several days. Although her pain profile became increasingly complicated by psychosocial suffering and disease progression, she did not experience the same pain event for the remainder of her hospital course. Findings from this case report demonstrate the utility of low-dose ketamine infusion in opioid-induced hyperalgesia.
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Journal of anesthesia · Dec 2018
Randomized Controlled TrialHigh-dose intraoperative remifentanil infusion increases early postoperative analgesic consumption: a prospective, randomized, double-blind controlled study.
The purpose of this study was to determine whether intraoperative infusion of remifentanil induces acute tolerance to opioids, and compare the postoperative pain and opioid consumption by the effect site concentrations of remifentanil. ⋯ Intraoperative infusion of remifentanil with 12 ng/ml of effect site concentration in patients undergoing gastrectomy increases early postoperative fentanyl requirement. Acute opioid tolerance would be developed by higher concentration of remifentanil than dosage of common anesthetic practice.
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Complex regional pain syndrome (CRPS) is a disorder that involves abnormal inflammation and nerve dysfunction frequently resistant to a broad range of treatments. Peripheral nerve stimulation with electroacupuncture (EA) has been widely used in different clinical conditions to control pain and inflammation; however, the use of EA in the treatment of CRPS is under investigation. In this study, we explore the effects of EA on hyperalgesia and edema induced in an animal model of chronic post-ischemia pain (CPIP model) and the possible involvement of endothelin receptor type B (ETB) in this effect. ⋯ Furthermore, the expression of peripheral ETB receptors was increased after EA treatments, as measured by western blot. These results may suggest that EA's analgesic effect is synergic with ETB receptor activation in the periphery, as well as central (spinal cord) ETB receptor blockade. These data support the use of EA as a nonpharmacological approach for the management of CRPS-I, in an adjuvant manner to ETB receptor targeting drugs.
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Neuroscience letters · Nov 2018
A new central post-stroke pain rat model: autologous blood injected thalamic hemorrhage involved increased expression of P2X4 receptor.
Stroke is the leading cause of disability and death in the world. Central post-stroke pain (CPSP), a central neuropathic pain syndrome occurring after cerebral stroke, is a serious problem. But on account of the lack of reliable animal models, the mechanisms underlying CPSP remains poorly understood. ⋯ A significant alleviation of mechanical allodynia was achieved following the administration of adrenergic antidepressants and antiepileptics. Meanwhile, we found a significant decrease in P2 × 4 receptor expression after treatment with these drugs. Taken together, our results suggest that targeting P2 × 4 receptor may be effective in the treatment of CPSP.