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A variety of barriers ensures the protection of the peripheral nervous system from noxious blood-borne or surrounding stimuli. In this review, anatomy and functioning of the blood nerve barrier (BNB) and the blood DRG barrier (BDB) will be presented and key tight junction proteins described: ZO-1, claudin-1, -3, -5, -11, -12, -19, occludin, and tricellulin. Different diseases can lead to or be accompanied by nerve barrier disruption and impairment of nerve barriers worsens pathology. Peripheral nerve injury, diabetic neuropathy and inflammatory polyneuropathy cause an increased permeability of BNB and BDB. Knowledge and understanding of these mechanisms might ultimately lead to the invention of drugs to control barrier function to help ameliorating neurological diseases.
Learn More >Complex regional pain syndrome (CRPS) and fibromyalgia are chronic pain conditions of unexplained origins. In addition to symptoms in the diagnostic criteria, patients can report changes to vision and other sensations or bodily functions. It is unclear whether these are greater than would be expected due to normal ageing, living with chronic pain generally, or common co-morbidities of chronic pain such as depression or anxiety. We administered an on-line survey evaluating the frequencies and types of self-reported somatic symptoms, bodily changes, and sensory sensitivity in respondents with CRPS (n=390), fibromyalgia (n=425), and both CRPS and fibromyalgia ('CRPS+fibromyalgia'; n=88) compared to respondents with other chronic pain conditions (n=331) and pain-free controls (n=441). The survey assessed somatic symptoms (Patient Health Questionnaire-15), bodily changes, pain/discomfort/distress triggers, and pain intensifiers. We conducted ANCOVA's with age, sex, Patient Health Questionnaire-9 (measuring depression), Generalized Anxiety Disorder-7, pain duration in years, hours of pain per day, and number of pain-related medical diagnoses as covariates. After controlling for covariates, respondents with CRPS and/or fibromyalgia reported more somatic symptoms, changes in movement and biological responses, pain/discomfort/distress triggers, and pain intensifiers than pain(-free) control groups. Fibromyalgia specifically related to changes in vision and hearing; urinary/intestinal function; and drinking and eating. CRPS changes related to changes in hair, skin, and nails; and infection and healing. The CRPS+fibromyalgia group presented with features of both disorders with minimal additional stressors or symptoms over and above these. Our findings suggest CRPS and fibromyalgia share underlying pathophysiologies, although specific mechanisms might be different.
Learn More >Health-related quality of life in chronic low back pain (LBP) is an important issue since various individual factors such as perceived loss of autonomy, inability to continue daily life and anxiety can contribute to maintenance or deterioration of this condition. Health-related quality of life is also important because it can predict the probability of recovery or recrudescence over time. In the literature, there is no systematic review on this topic. The present paper describes a protocol of the first systematic review and meta-analysis aimed at summarising the data on health-related quality of life in patients with chronic LBP compared with healthy controls. Gender, age and comorbidity of psychiatric disorders (mood or anxiety disorders) will be explored as moderators. Studies will be included if they used a case-control design comparing adults with chronic LBP to healthy controls on health-related quality of life through validated interviews/questionnaires.
Learn More >As a post-approval commitment, this dose-ranging study was undertaken to evaluate efficacy and safety of onabotulinumtoxinA in adolescents.
Learn More >Chronic neuropathic pain associated with peripheral neuropathies cannot be attributed solely to lesions of peripheral sensory axons and likely involves alteration in the processing of nociceptive information in the central nervous system in most patients. Few data are available regarding EEG correlates of chronic neuropathic pain. The fact is that effective cortical neuromodulation strategies to treat neuropathic pain target the precentral cortical region, i.e. a cortical area corresponding to the motor cortex. It is not known how these strategies might modulate brain rhythms in the central cortical region, but it can be speculated that sensorimotor rhythms (SMRs) are modified. Another potent way of modulating cortical rhythms is to use EEG-based neurofeedback (NFB). Rare studies previously aimed at relieving neuropathic pain using EEG-NFB training.
Learn More >Psychological characteristics are important in the development and progression of low back pain (LBP), however their role in persistent, severe LBP is unclear.
Learn More >Neuropathic pain is a frequent condition caused by a lesion or disease of the central or peripheral somatosensory nervous system. A frequent cause of peripheral neuropathic pain is diabetic neuropathy. Its complex pathophysiology is not yet fully elucidated, which contributes to underassessment and undertreatment. A mechanism-based treatment of painful diabetic neuropathy is challenging but phenotype-based stratification might be a way to develop individualized therapeutic concepts. Our goal is to review current knowledge of the pathophysiology of peripheral neuropathic pain, particularly painful diabetic neuropathy. We discuss state-of-the-art clinical assessment, validity of diagnostic and screening tools, and recommendations for the management of diabetic neuropathic pain including approaches towards personalized pain management. We also propose a research agenda for translational research including patient stratification for clinical trials and improved preclinical models in relation to current knowledge of underlying mechanisms.
Learn More >To conduct a systematic literature review of spinal cord stimulation (SCS) for pain.
Learn More >To characterize the clinical features of a large sample of children, adolescents, and young adults with a history of status migrainosus (SM) and to describe their short-term prognosis.
Learn More >To investigate plasma glucose changes during the ictal state of migraine compared to the interictal state.
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