The journal of pain : official journal of the American Pain Society
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Dexamethasone supplementation to local anesthetics prolongs its action, yet the underlying mechanism is unclear. Previous studies have reported that increased p-p38 mitogen-activated protein kinase (MAPK) in the dorsal root ganglia (DRG) is associated with pain-associated behavior and that nitric oxide (NO), which is known to be a pronociceptive substance, directly inhibits sciatic nerve conduction. Here, we investigated the temporal changes in the hyperalgesic effect and p-p38 MAPK and NO synthase (NOS) expression levels in the DRG when dexamethasone was added to ropivacaine used for a sciatic nerve block (SNB) in postoperative pain model mice. ⋯ These results suggest that dexamethasone supplementation to local anesthetics prolongs the analgesic effect by inhibiting nNOS activity. PERSPECTIVE: The current study revealed that dexamethasone supplementation to local anesthetics prolongs the analgesic effect by inhibiting the activity of neuronal NOS and that p-p38 MAPK may not be involved in this phenomenon. Our findings offer a new target for the discovery of long-acting local anesthetics.
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Wide-spread cultural beliefs influence personal experiences and clinical treatment of pain, yet are often unexamined and unchallenged in the pain literature. The common cultural belief that people generally over-report or exaggerate pain is familiar, reflected in discordant patient-provider pain assessments, and compounded in the context of disparities in pain treatment. However, no studies have directly measured the prevalence of this belief among the general population, nor challenged the validity of this assumption by assessing normative pain reporting in clinical settings. ⋯ Results reinforce the need for respecting patient pain reports, and suggest that distrust surrounding others' pain experiences is prevalent in society. PERSPECTIVE: Most people claim to report their pain as accurately as possible, while simultaneously perpetuating common cultural beliefs that others over-report their pain. This fundamental pain bias highlights a pervasive misconception that likely contributes to patient-provider mistrust and broader cultural pain stigma.
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People with chronic pain report experiencing stigma, but few studies have explored this in detail. This mixed-methods study aimed to investigate factors that contribute to chronic pain stigma, the effects of stigma, and to explore the stigma experiences of people with chronic pain. Participants were 215 adults with chronic pain who completed questionnaires assessing chronic pain stigma, opioid use, mental health conditions, pain, depression, disability and social support, and 179 also answered open-ended questions about stigma experiences. ⋯ This study demonstrates the negative influence of stigma and presents a novel integrated model of chronic pain stigma which may be used to develop interventions. PERSPECTIVE: This study demonstrates the contributors to, and negative effects of, stigma for people with chronic pain. It presents an integrated model which could guide strategies to reduce chronic pain stigma amongst health professionals and the public, and to reduce self-stigma amongst people with pain.