Pain medicine : the official journal of the American Academy of Pain Medicine
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In a previous study, persistent pain was suggested to be a risk factor for tumor patients. However, the mechanism underlying this phenomenon is still unclear. Substance P (SP), a pain-related neuropeptide secreted by the neural system and the immune system, plays an important role in the induction and maintenance of persistent pain. ⋯ Based on the results above, we proposed a possible mechanism underlying pain affecting tumor progression: The presence of pain increases the content of SP in patients' blood, and elevated SP increases the expression of tumor TLR-4 by acting on the NK-1 receptor, which ultimately affects the biological activity of the tumor.
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Neck pain remains highly prevalent and costly worldwide. Although reassurance has been recommended as a first line of treatment, specific advice on the best ways to provide reassurance has not been provided due to lack of evidence. Pain symptoms and experiences differ between patients with whiplash-associated disorder (WAD) and those with nontraumatic neck pain (NTNP). The aims of this study were to 1) identify and compare the concerns, fears, and worries of patients with WAD and NTNP; and 2) determine if patients believe their concerns are addressed by primary care providers. ⋯ This detailed comparison provides information about neck pain patients' concerns and fears, while providing health practitioners support for selecting strategies to promote reassurance appropriately for individual patient needs. Our findings from patients' perspectives enhance the understanding for providing reassurance for neck pain as proposed by our analysis.
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The development of persistent pain following total knee arthroplasty (TKA) is common, but its underlying mechanisms are unknown. The goal of the study was to assess brain grey matter structure and its correlation with function of the nociceptive system in people with good and poor outcomes following TKA. ⋯ Persistent pain at six months after TKA is associated with a higher grey matter density in the regions involved in central sensitization and pain-related fear, which may contribute to the development of persistent pain after surgery.