European journal of pain : EJP
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Biased interpretations of ambiguous bodily threat situations characterize youth with chronic pain, and have been associated with functional disability for this population. Despite predictions by the fear-avoidance model of chronic pain, that fear and avoidance of pain explain the association between threat perceptions and disability, this has not yet been explored in youth with chronic pain. This study aimed to address this gap by investigating these proposed relationships, in addition to the association between bodily threat interpretations and daily aspects of disability (as well as social, and emotional impairments). ⋯ Psychological theories of pain-associated impact and disability point to fear and avoidance of pain, as well as information-processing biases. Here, we present novel data showing the clinical relevance of bodily and social threat interpretations in explaining pain-related disability amongst youth with chronic pain, potentially by shaping fear and avoidance of pain. Longitudinal designs will be required to assess these temporally sensitive mediation pathways.
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Randomized Controlled Trial
Dependence-like behaviour in patients treated for medication overuse headache: A prospective open-label randomized controlled trial.
Dependence-like behaviour may complicate withdrawal and increase risk of relapse of medication overuse headache (MOH). The most effective treatment for reducing dependence-like behaviour is unknown. ⋯ Withdrawal combined with preventive medication from start is the treatment strategy that reduces dependence-like behaviour the most in MOH patients. Patients initially considered preventive treatment without withdrawal as the most feasible treatment. However, no difference in feasibility between the three arms was found at 6-month follow-up. Withdrawal combined with preventive medication is recommended for treatment of MOH.
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In the context of neuropathic pain, the contribution of regeneration to the development of positive symptoms is not completely understood. Several efforts have been done to described changes in axotomized neurons, however, there is scarce data on changes occurring in intact neurons, despite experimental evidence of functional changes. To address this issue, we analysed by immunohistochemistry the presence of phosphorylated signal transducer and activator of transcription 3 (pSTAT3), an accepted marker of regeneration, within DRGs where axotomized neurons were retrogradely labelled following peripheral nerve injury. Likewise, we have characterized abnormal electrophysiological properties in intact fibres after partial nerve injury. ⋯ Positive symptoms in patients with peripheral neuropathies correlate to abnormal functioning of different subpopulations of primary afferents. Peripheral nerve damage triggers regenerating programs in the cell bodies of axotomized but also in non-axotomized nociceptors which is in turn, develop abnormal spontaneous and evoked discharges. Therefore, intact nociceptors have a significant role in the development of neuropathic pain due to their hyperexcitable peripheral terminals. Therapeutical targets should focus on inhibiting peripheral hyperexcitability in an attempt to limit peripheral and central sensitization.
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Randomized Controlled Trial
Nasopharyngeal swab-induced pain for SARS-CoV-2 screening: A randomised controlled trial of conventional and self-swabbing.
Massive screening campaigns for SARS-CoV-2 are currently carried out throughout the world, relying on reverse-transcriptase-polymerase chain reaction (RT-PCR) following nasopharyngeal swabbing performed by a healthcare professional. Yet, due to the apprehension of pain induced by nasopharyngeal probing, poor adhesion to those screening campaigns can be observed. To enhance voluntary participation and to avoid unnecessary exposition to SARS-CoV-2, self-swabbing could be proposed. To date, no data have been published concerning pain induced by conventional- or self-swabbing. Thus, the primary objective of the present study was to evaluate pain induced with the conventional swabbing method and compare it to self-swabbing. Secondary objectives focused on swabbing-induced discomfort and acceptability of the two methods. ⋯ Using the thinnest available swabs, procedural pain induced by nasopharyngeal swabbing for SARS-CoV-2 screening is very low for most subjects and should not limit voluntary participation in screening campaigns. Self-swabbing does not lead to more pain or discomfort compared to conventional swabbing, is well-accepted, and could be proposed to optimize screening campaigns, at least in healthcare professionals.
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The rat mid-thoracic contusion model has been used to study at-level tactile allodynia, a common type of pain that develops after spinal cord injury (SCI). An important advantage of this model is that not all animals develop hypersensitivity. Therefore, it can be used to examine mechanisms that are strictly related to the development of pain-like behaviour separately from mechanisms related to the injury itself. However, how to separate animals that develop hypersensitivity from those that do not is unclear. ⋯ However, the amount of spared spinal matter in the cord did not explain the development of hypersensitivity, as previously reported. This approach can be used to study the mechanisms underlying the development of hypersensitivity separately from mechanisms related to injury alone.