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Chronic pain and infection: mechanisms, causes, conditions, treatments, and controversies.

ABSTRACT: Throughout human history, infection has been the leading cause of morbidity and mortality, with pain being one of the cardinal warning signs. However, in a substantial percentage of cases, pain can persist after resolution of acute illness, manifesting as neuropathic, nociplastic (eg, fibromyalgia, irritable bowel syndrome), or nociceptive pain. Mechanisms by which acute infectious pain becomes chronic are variable and can include immunological phenomena (eg, bystander activation, molecular mimicry), direct microbe invasion, central sensitization from physical or psychological triggers, and complications from treatment. Microbes resulting in a high incidence of chronic pain include bacteria such as the Borrelia species and Mycobacterium leprae, as well as viruses such as HIV, SARS-CoV-2 and herpeses. Emerging evidence also supports an infectious cause in a subset of patients with discogenic low back pain and inflammatory bowel disease. Although antimicrobial treatment might have a role in treating chronic pain states that involve active infectious inflammatory processes, their use in chronic pain conditions resulting from autoimmune mechanisms, central sensitization and irrevocable tissue (eg, arthropathy, vasculitis) or nerve injury, are likely to cause more harm than benefit. This review focuses on the relation between infection and chronic pain, with an emphasis on common viral and bacterial causes.

SUBMITTER: Cohen SP

PROVIDER: S-EPMC10012866 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature

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Chronic pain and infection: mechanisms, causes, conditions, treatments, and controversies.

Cohen Steven P SP Wang Eric J EJ Doshi Tina L TL Vase Lene L Cawcutt Kelly A KA Tontisirin Nuj N

BMJ medicine 20220331 1

Throughout human history, infection has been the leading cause of morbidity and mortality, with pain being one of the cardinal warning signs. However, in a substantial percentage of cases, pain can persist after resolution of acute illness, manifesting as neuropathic, nociplastic (eg, fibromyalgia, irritable bowel syndrome), or nociceptive pain. Mechanisms by which acute infectious pain becomes chronic are variable and can include immunological phenomena (eg, bystander activation, molecular mimi ...[more]

PMID: 36936554

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Project description:Multidisciplinary pain management programs (MPMP) for patients suffering from chronic back pain include a variety of treatment modalities. The patients' perceived helpfulness of these treatment modalities remains unclear. The aims of this prospective observational cohort study were to assess (i) the patients' perceived helpfulness of different treatment modalities, (ii) the influence of sociodemographic characteristics on the patient's perspective and (iii) whether treatment outcomes are affected by helpfulness ratings. Treatment modalities of this three-week MPMP consisted of individual physiotherapy, group-based physiotherapy, relaxation therapy, aquatic therapy, back education, medical training therapy, biofeedback, psychological pain therapy and music therapy. The study comprised 395 patients. The main outcome was the patients' perceived treatment helpfulness at the end of the program measured by a self-reported questionnaire ranging from 1 (not at all helpful) to 6 (extremely helpful). Secondary outcomes were treatment effects on pain, pain related disability, functional ability and level of depressive symptoms measured by self-reported questionnaires (NRS, PDI, FFbH-R, ADS-L). A total of 276 patients (22-64 years, 57% female) were available for overall analysis. Multivariate-analysis-of-variance- (MANOVA-) related results revealed that perceived treatment helpfulness (range 1-6) differed significantly between treatment modalities: individual physiotherapy (M = 5.00), group-based physiotherapy (M = 4.87), relaxation therapy (M = 4.6), aquatic therapy (M = 4.54), back education (M = 4.43), medical training therapy (M = 3.38), biofeedback (M = 3.31), psychological pain therapy (M = 3.15), music therapy (M = 3.02). Pain, pain related disability and levels of depressive symptoms significantly improved after the program (p < 0.001) whereas functional ability decreased (p < 0.01). Significant correlations were found between helpfulness ratings and sociodemographic data indicating that perceived treatment helpfulness was influenced by patient-related factors. Importantly, the degree of pain-related improvements was affected by the patients' perceived treatment helpfulness. In conclusion, patients' perceived treatment helpfulness differs significantly between treatment modalities and corresponds to treatment outcome.

Project description:INTRODUCTION:Knee pain is common in adolescents and adults and is associated with an increased risk of developing knee osteoarthritis. The aim of this systematic review was to gather and appraise the cost-effectiveness of treatment approaches for non-osteoarthritic knee pain conditions. METHOD:A systematic review was conducted according to the PRISMA guidelines and registered on PROSPERO (CRD42016050683). The literature search was done in MEDLINE via PubMed, EMBASE, The Cochrane Library, and the National Health Service Economic Evaluation Database. Study selection was carried out by two independent reviewers and data were extracted using a customized extraction form. Study quality was assessed using the Consensus on Health Economic Criteria list. RESULTS:Fifteen studies were included. The majority regarded the treatment of anterior cruciate ligament (ACL) injuries, but we also identified studies evaluating other knee pain conditions such as meniscus injuries, cartilage defects, and patellofemoral pain syndrome. Study interventions were categorized as surgical or non-surgical interventions. The surgical interventions included ACL reconstruction, chondrocyte implantation, meniscus scaffold procedure, meniscal allograft transplantation, partial meniscectomy, microfracture, and different types of autografts and allografts. The non-surgical management consisted of physical therapy, rehabilitation, exercise, counselling, bracing, and advice. In general, for ACL injuries surgical management alone or in combination with rehabilitation appeared to be cost-effective. The quality of the economic evaluations was of moderate to high quality. CONCLUSION:There was insufficient evidence to give a firm overview of cost-effective interventions for non-osteoarthritic knee pain, but surgical treatment of acute ACL injury appeared cost-effective. There is very little data regarding the cost-effectiveness of non-surgical interventions for non-traumatic knee conditions.

Dataset Information

Chronic pain and infection: mechanisms, causes, conditions, treatments, and controversies.

Publications

Chronic pain and infection: mechanisms, causes, conditions, treatments, and controversies.

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