Pain
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Randomized Controlled Trial
Choice over placebo administration enhances open-label placebo hypoalgesia.
Many studies indicate that deceptively administered placebos can improve pain outcomes. However, the deception involved presents an ethical barrier to translation because it violates informed consent and patient autonomy. Open-label placebos (OLPs), inert treatments that are openly administered as placebos, have been proposed as an ethically acceptable alternative. ⋯ Of interest, there was no evidence for OLP hypoalgesia without choice relative to natural history. Furthermore, variability in pain intensity did not affect OLP hypoalgesia. The current findings present novel evidence that choice over treatment administration may be a cheap and effective strategy for boosting the efficacy of OLPs in the clinical care of pain.
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Individuals vary significantly in their pain sensitivity, with contributions from the brain, genes, and psychological factors. However, a multidimensional model integrating these factors is lacking due to their complex interactions. To address this, we measured pain sensitivity (ie, pain threshold and pain tolerance) using the cold pressor test, collected magnetic resonance imaging (MRI) data and genetic data, and evaluated psychological factors (ie, pain catastrophizing, pain-related fear, and pain-related anxiety) from 450 healthy participants with both sexes (160 male, 290 female). ⋯ Notably, pain catastrophizing was negatively correlated with pain tolerance, and this relationship was mediated by the multimodal covarying brain patterns in male participants only. Furthermore, we identified an association between the single-nucleotide polymorphism rs4141964 within the fatty acid amide hydrolase gene and pain threshold, mediated by the identified multimodal covarying brain patterns across all participants. In summary, we suggested a model that integrates the brain, genes, and psychological factors to elucidate their role in shaping interindividual variations in pain sensitivity, highlighting the important contribution of the multimodal covarying brain patterns as important biological mediators in the associations between genes/psychological factors and pain sensitivity.
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Preliminary evidence suggests that there are significant associations between bullying and chronic pain, as well as between the quality of peer relationships and psychological function in youth with chronic pain. However, these findings have yet to be replicated, and the role that bullying plays in anxiety in children and adolescents with chronic pain has not yet been examined. This study sought to expand our understanding of the associations between measures of bullying and quality of peer relationships and pain-related function domains in a community sample of schoolchildren with chronic pain. ⋯ In the group of youth with chronic pain, the measures of past and current bullying, and quality of peer relationships, were not significantly associated with pain intensity, pain interference, or anxiety. However, having a history of being bullied and the quality of peer relationships were significantly associated with depressive symptom severity. The findings indicate that research to evaluate the potential causal role of bullying and the quality of peer relationships on pain-related function domains in youth with chronic pain is warranted.