Articles: neuropathic-pain.
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Observational Study
A preliminary prospective observational study of the effectiveness of high-concentration capsaicin cutaneous patch in the management of chronic post-surgical neuropathic pain.
Chronic post-surgical neuropathic pain is difficult to treat. Topically applied analgesics provide an alternative to systemic therapy in localised neuropathic pain syndromes. The aim of this study was to prospectively assess whether 8% capsaicin is effective in surgically induced neuropathic pain. ⋯ This prospective study provides preliminary evidence for an improvement in patient outcomes with 8% capsaicin in surgically induced neuropathic pain. Improvements were noted in pain interference, and significant reductions in the painful surface area were noted for those who underwent subsequent treatments. Findings should be replicated in a randomised control trial to establish causation.
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Case Reports
Hoigne Syndrome Secondary to Intravenous Lidocaine in a Woman with Metastatic Ewing Sarcoma.
Introduction: Palliative care providers are increasingly using lidocaine infusions for refractory cancer pain. Hoigne syndrome (HS) is a rare psychiatric reaction that has been reported after local anesthetic usage, but has not been described in the palliative care setting. ⋯ She had improvement with the addition of benzodiazepines and lowering the lidocaine infusion rate. Discussion: Palliative care providers should be aware of HS as a possible side effect of lidocaine infusions and the unique challenges in managing it in patients near the end of life.
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Poststroke pain (PSP) is a heterogeneous term encompassing both central neuropathic (ie, central poststroke pain [CPSP]) and nonneuropathic poststroke pain (CNNP) syndromes. Central poststroke pain is classically related to damage in the lateral brainstem, posterior thalamus, and parietoinsular areas, whereas the role of white matter connecting these structures is frequently ignored. In addition, the relationship between stroke topography and CNNP is not completely understood. ⋯ Our exploratory analysis showed that, besides known thalamic and parietoinsular areas, significant voxels carrying a high risk for CPSP were located in the white matter encompassing thalamoinsular connections (one-tailed threshold Z > 3.96, corrected P value <0.05, odds ratio = 39.7). These results show that the interruption of thalamocortical white matter connections is an important component of CPSP, which is in contrast with findings from nonneuropathic PSP and from strokes without pain. These data can aid in the selection of patients at risk to develop CPSP who could be candidates to pre-emptive or therapeutic interventions.
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Pain, either nociceptive or neuropathic (NP), is a common symptom in Charcot-Marie-Tooth (CMT) disease. ⋯ Neuropathic pain is a frequent finding in Charcot-Marie Tooth disease and is related to Aδ fibers impairment. Patients at higher risk are those belonging to certain genetic subtypes (i.e. CMT1A and CMT2J) or with laser-evoked potentials abnormalities. While managing this disease, clinicians should be aware of this symptom in order to offer best treatment options to their patients.
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Neuropathic pain takes a heavy toll on individual well-being, while current therapy is far from desirable. Herein, we assessed the analgesic effect of β-elemene, a chief component in the traditional Chinese medicine Curcuma wenyujin, and explored the underlying mechanisms at the level of spinal dorsal horn (SDH) under neuropathic pain. A spared nerve injury (SNI)-induced neuropathic pain model was established in rats. ⋯ SNI significantly increased the expression of p-ERK in spinal astrocytes but not microglia on day 29. β-elemene reversed spinal astrocytic ERK activation and subsequent upregulation of proinflammatory cytokines in SNI rats, with no effect on the expression of p38 and JNK in spinal glia. β-elemene also exerted antioxidative effects by increasing the levels of SOD and GSH-PX and decreasing the level of MDA. Our results suggest that SNI induces robust astrocytic ERK activation within the SDH in the late phase of neuropathic pain. β-elemene exerts remarkable analgesic effects on neuropathic pain, possibly by inhibiting spinal astrocytic ERK activation and subsequent neuroinflammatory processes. Our findings suggest that β-elemene might be a promising analgesic for the treatment of chronic pain.