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Introduction: Neuropathic pain (NP) is characterised as a lesion or disease directly affecting the somatosensory system. This study aims to analyse the efficacy of botulinum toxin type A (BT-A) in the treatment of neuropathic pain. Methods: This systematic literature review, guided by PRISMA, applied the PICO strategy with the following criteria: (P = patients with neuropathic pain, I = botulinum toxin, C = placebo or active drug, and O = pain relief). Results: Fourteen articles, all randomised controlled trials with a placebo control, were included in the review. A total of 645 patients were randomised, with 353 patients receiving treatment with botulinum toxin type A in doses ranging from 25U to 400U. The evaluated studies addressed trigeminal neuralgia, diabetic polyneuropathy, post-herpetic neuralgia, spinal cord injury, phantom limb pain, and peripheral neuropathic pain after trauma or surgery. Conclusion: BT-A has emerged as a promising treatment for various origins of neuropathic pain. Therefore, future studies should adopt stricter criteria regarding dosage and routes of administration to ensure effective and consistent BT-A application.

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Aim: This study reassesses the efficacy and safety of antidepressants in treating nonspecific chronic low back pain (NCLBP).Materials & methods: A systematic review was conducted following PRISMA guidelines, including randomized clinical trials (RCTs) from PubMed, Embase, Scopus, LILACS, SciELO and Cochrane CENTRAL, published through August 2024. Studies compared antidepressants with placebo or active comparators. The primary outcomes were pain relief and quality of life. Protocol registration: www.crd.york.ac.uk/prospero identifier is CRD42023307516.Results: Nine RCTs involving 1758 patients were analyzed. The antidepressants examined included duloxetine, escitalopram, bupropion, amitriptyline, imipramine and desipramine. Duloxetine 60 mg significantly reduced pain (MD = -0.57; 95% CI = -0.78 to -0.36) and improved quality of life compared with placebo, with side effects that were generally tolerable. Notably, higher doses of duloxetine (120 mg) were associated with an increase in adverse events. However, other antidepressants like amitriptyline and escitalopram demonstrated only modest or inconsistent effects.Conclusion: Duloxetine at 60 mg provides consistent pain relief and improves the quality of life in NCLBP, but higher doses increase adverse events. Escitalopram might offer modest benefits but should be considered a third-line treatment. Other antidepressants, such as amitriptyline, bupropion, imipramine and desipramine, have limited evidence supporting their efficacy and are associated with adverse effects.

Chronic lower back pain is a condition that persists for a long time and can be difficult to manage. While the exact cause isn't always clear, it affects many people and can be difficult to manage. Doctors sometimes prescribe antidepressants, which are typically used for treating depression, but they may also help to reduce pain by influencing how the brain processes it.In this paper, we examined several studies to determine whether these antidepressants are effective in treating chronic lower back pain. We analyzed nine studies involving 1758 participants who were treated with different medications: bupropion, duloxetine, escitalopram, amitriptyline, imipramine and desipramine.Among these medications, duloxetine stood out as the most effective. It not only helped to relieve pain but also improved the participants' ability to carry out daily activities. Additionally, duloxetine had fewer side effects than some of the other medications, although it can still cause mild issues such as nausea.In conclusion, duloxetine appears to be a promising option for managing chronic lower back pain, as long as the appropriate dosage is used to balance pain relief and side effects.

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This study aims to assess the efficacy of low-dose naltrexone (LDN) in treating chronic pain. We conducted a systematic review using the PICO strategy: (P) Patients with chronic pain, (I) Use of oral naltrexone, (C) Placebo or active drug and (O) Pain relief and quality of life. We included articles from PubMed, Scopus, Cochrane CENTRAL and EMBASE databases. Seven randomized clinical trials involving 406 patients were analyzed. The doses ranging from 2 to 4.5 mg once daily across all studies. Various chronic pain conditions were evaluated. The results suggest that low-dose naltrexone is not effective in managing chronic pain and improving the quality of life in patients with diverse chronic pain conditions. However, further research with larger sample sizes and standardized methodologies is necessary.

This study looks at how well low-dose naltrexone (LDN) works for treating long-lasting pain. We reviewed research where patients with chronic pain were given either LDN or a placebo (a fake treatment). We found eight studies that included a total of 421 patients. The LDN doses used ranged from very small amounts 2­4.5 mg, taken once a day. These studies looked at different types of chronic pain. Our results suggest that LDN cannot help to reduce pain and improve the quality of life for people with chronic pain. However, more research with larger groups of people and consistent methods is needed to confirm these findings.

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Complex Regional Pain Syndrome (CRPS) is characterized by pain, swelling, limited range of motion, skin changes, vasomotor instability, and bone demineralization. This study aims to assess the efficacy of botulinum toxin type A (BoNT-A) in the treatment of CRPS. We conducted a systematic literature review following the PRISMA guidelines, using the PICO strategy (Patient, Intervention, Comparison and Outcome) with the following criteria: P = Patients with CRPS; I = Botulinum toxin; C = Placebo or active drug; and O = Pain relief. Three randomized controlled trials with placebo controls were included, involving a total of 64 patients, 36 of whom received BoNT-A in doses ranging from 40U to 200U. The studies examined both lumbar sympathetic block and local application methods. Botulinum toxin shows promise in alleviating pain associated with CRPS, particularly when used as an adjunct to lumbar sympathetic blockade. However, the limited number of studies and small sample sizes impede reaching definitive conclusions regarding its efficacy and safety. Notably, local applications (intradermal or subcutaneous) require further investigation, as current evidence is insufficient and reports indicate patient discomfort. While preliminary findings suggest potential benefits of BoNT-A in managing CRPS, larger randomized trials are necessary to confirm its efficacy and safety.

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PURPOSE: This study aims to assess the efficacy of botulinum toxin type A (BT-A) in treating tennis elbow. METHODS: We systematically reviewed the literature and included full-text randomized clinical trials (RCTs) published until June 2024, available in PubMed, Scopus, Embase, and Cochrane CENTRAL databases. Eligible studies involved patients with tennis elbow and compared BT-A with placebo or other injectable treatments. Primary outcomes included pain relief, while secondary outcomes assessed quality of life, adverse effects, and grip strength. The risk of bias was evaluated using the Cochrane Risk of Bias tool. RESULTS: Seven RCTs with a total of 381 patients were included. The participants were predominantly middle-aged (mean age 46.64 ± 7.72 years) and diagnosed with chronic tennis elbow. BT-A doses ranged from 20U to 60U. Compared to placebo, BT-A effectively reduced pain at two to four weeks (MD = -1.37; 95% CI = -2.18 to -0.57) and at eight to 12 weeks (MD = -1.13; 95% CI = -1.62 to -0.65). Grip strength was comparable between the BT-A and placebo groups at both time points (2 to 4 weeks: SMD = -0.86; 95% CI -1.78 to 0.05; 8 to 12 weeks: SMD = 0.00; 95% CI = -0.95 to 0.95). CONCLUSION: This meta-analysis suggests that BT-A reduces pain in tennis elbow within two to 12 weeks compared to placebo. Findings are limited by study size, and further research is needed to confirm its efficacy and safety.

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INTRODUCTION: This study explores the interaction between cytokines, cell-mediated immunity (T cells, B cells, and NK cells), and prolonged morphine administration in chronic neuropathic pain patients without cancer-related issues. Despite evidence of opioid immunomodulation, few studies have compared these interactions. METHODS: In a cross-sectional and comparative study, 50 patients with chronic low back radicular pain ("Failed Back Surgery Syndrome") were categorized into intrathecal morphine infusion (IT group, n = 18), oral morphine (PO group, n = 17), and non-opioid treatment (NO group, n = 15). Various parameters, including plasma and cerebrospinal fluid (CSF) cytokine concentrations, lymphocyte immunophenotyping, opioid escalation indices, cumulative morphine dose, and treatment duration, were assessed. RESULTS: CSF IL-8 and IL-1ß concentrations exceeded plasma levels in all patients. No differences in T, B, and NK lymphocyte numbers were observed between morphine-treated and non-treated patients. Higher plasma IL-5 and GM-CSF concentrations were noted in IT and PO groups compared to NO. CSF IFNγ concentrations were higher in PO and NO than IT. Positive correlations included CD4 concentrations with opioid escalation indices, and negative correlations involved NK cell concentrations, CSF TNFα concentrations, and opioid escalation indices. Positive correlations were identified between certain cytokines and pain intensity in IT patients, and between NK cells and cumulative morphine dose. Negative correlations were observed between CSF IL-5 concentrations and pain intensity in IT and PO, and between opioid escalation indices and CSF cytokine concentrations in PO and IT. CONCLUSION: Associations between cytokines, cellular immunity, and prolonged morphine treatment, administered orally and intrathecally were identified.

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OBJECTIVE: This systematic literature review aims to evaluate the effectiveness of transdermal opioids in managing cancer pain and their impact on the quality of life (QoL) of patients. DATA SOURCES: A systematic literature review conducted following the PRISMA protocol, focusing on randomized clinical trials found in the Lilacs, Embase, PubMed, and SciELO databases over the last 20 years. STUDY SELECTION AND DATA EXTRACTION: We included randomized clinical trials, published in English, Portuguese, or Spanish, which assessed the impact of transdermal opioids on the QoL. Data extraction was facilitated using the Rayyan app. DATA SYNTHESIS: Six articles meeting the inclusion and exclusion criteria were analyzed. These studies covered a population ranging from 24 to 422 cancer patients experiencing moderate to severe pain. The risk of bias was assessed in each study, generally being categorized as uncertain or high. RELEVANCE TO PATIENT CARE AND CLINICAL PRACTICE: The findings indicate that the analgesic effectiveness and side effects of transdermal formulations (specifically buprenorphine and fentanyl) for managing moderate to severe cancer pain are comparable to, or in some cases superior to, those of oral opioids traditionally employed. CONCLUSIONS: Transdermal therapy was suggested to have several advantages over oral opioid therapy in enhancing cancer patients' QoL. These benefits span various dimensions, including pain management, physical functioning, mental health, vitality, overall patient improvement, anger/aversion, strength/activity, general QoL, cognitive and emotional functions, fatigue, and insomnia.