European journal of pain : EJP
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Randomized Controlled Trial
Menstrual cycle phase does not influence gender differences in experimental pain sensitivity.
Influence of menstrual cycle phase on experimental pain sensitivity in women and on gender differences in pain sensitivity was examined in 48 men and 49 women in response to cold pressor, heat, and ischemic pain. Each woman was tested at three points in their menstrual cycle in randomized order, the early follicular, late follicular, and luteal phases, while men were also tested three times, controlling for number of days between test sessions. ⋯ However, pain perception during each task was not influenced by the menstrual cycle in women, nor did the menstrual cycle influence the magnitude of the gender differences in pain sensitivity. These results indicate that although women are more sensitive to a variety of noxious stimuli than men, menstrual cycle phase does not appear to moderate those differences in healthy men and women.
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Catastrophic thinking about pain has been identified as an important determinant of adjustment to pain, in both adults and children. No study has investigated the prospective and unique role of catastrophizing in explaining later pain and disability in children. The aim of the present study was to investigate the prospective roles of catastrophic thinking about pain, pain intensity, and trait anxiety and their putative relationship with pain and disability tested 6 months later. ⋯ The variability in disability and pain complaint could not be explained by trait anxiety. Instead anxious disposition might be best conceived of as a precursor of catastrophizing in children; i.e. children with higher levels of trait anxiety at baseline were more inclined to report higher levels of catastrophizing at follow-up. The findings are discussed in terms of potential mechanisms through which catastrophizing might exert its negative impact upon pain and disability outcomes in children.
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This study evaluated the antinociceptive effects of the selective and non-peptide CXCR2 antagonist SB225002 in mouse models of pain. As assessed in different tests of spontaneous nociception, intraperitoneal (i.p.) administration of SB225002 caused consistent and dose-related reduction of acetic acid-induced abdominal constrictions, whereas it did not significantly affect the nociception evoked by formalin, capsaicin, glutamate or phorbol ester acetate (PMA). Systemic treatment with SB225002 strikingly reduced the spontaneous nociception induced by 8-bromo-cAMP (8-Br-cAMP), or mechanical hypernociception induced by prostaglandin E(2) (PGE(2)), epinephrine, or the keratinocyte-derived chemokine (KC). ⋯ In the persistent models of pain evoked by complete Freund's adjuvant (CFA) or by the partial ligation of the sciatic nerve (PLSN), the repeated administration of SB225002 displayed prominent and long-lasting antinociceptive effects. Notably, SB225002 did not evoke unspecific central effects, as evaluated in the open-field and rota-rod tests, or even in the latency responses for thermal stimuli. Our data confirm the previous notion on the critical role exerted by chemokines in pain, indicating that selective CXCR2 antagonists, such as SB225002, might well represent interesting and innovative alternatives for the management of both acute and chronic pain.
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Although there is increasing knowledge of the prevalence of neuropathic pain, little has been done to isolate the cost of neuropathic pain, especially with reference to the frequent complaint of back pain. ⋯ Back pain with neuropathic components is likely to affect a relevant proportion of the general adult population and cause a disproportionately high share of back pain-related costs.
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Randomized Controlled Trial
Long-term follow-up of tailored behavioural treatment and exercise based physical therapy in persistent musculoskeletal pain: A randomized controlled trial in primary care.
This study examined long-term effects of a tailored behavioural treatment protocol (TBT), as compared with an exercise based physical therapy protocol (EBT). One-hundred and twenty-two patients who, due to persistent musculoskeletal pain, consulted physical therapists in primary care were originally randomized to either of the two conditions. Follow-up assessments two-year post-treatment were completed by 65 participants. ⋯ Fear of movement/(re)injury increased in the EBT-group, and EBT participants reported higher fear of movement/(re)injury two years post-treatment compared to TBT. The study supports tailoring of treatments in concordance with patients' needs and preferences of activity goals and functional behavioural analyses including predictors of pain-related disability, for successful immediate outcomes and their maintenance in the long run. Exercise-based treatments resulted in somewhat smaller immediate treatment effects but had similar maintenance of effects over the 2-year follow-up period.