Pain
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Bladder pain syndrome (BPS) is associated with breakdown of the protective uroepithelial barrier of the urinary bladder allowing urinary constituents access to bladder sensory neurons. Although there are several animal models of cystitis, none specifically relates to BPS. Here, we aimed to create such a model using enzymatic digestion of the barrier proteoglycans (PGs) in the rat. ⋯ There was a significant decrease in abdominal mechanical withdrawal threshold postdeglycosylation compared with controls. The results of this animal study suggest that many of the clinical features of BPS are seen after PG digestion from the bladder lumen. This model can be used to further understand mechanisms of pain in patients with BPS and to test new therapeutic strategies.
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Randomized Controlled Trial
Long-term outcomes from training in self-management of chronic pain in an elderly population: A randomised controlled trial.
This study compares the outcomes, from pretreatment to 1-year follow-up, of an outpatient, CBT-based pain self-management program (PSM) that included exercises, pain education, and pain coping strategies, with a control condition (exercise-attention control, EAC) that included exercises and a control for the attention of the treatment team. We previously reported short-term results (to 1-month follow-up) from the same study. This new paper considers the important issue of maintenance of treatment-related gains. ⋯ The mean effect size for these gains by the pain self-management program group over the exercise-attention control group was 0.37 (range: 0.29-0.45), which is in the small effect size range. While statistically and clinically meaningful, these findings do indicate some weakening in effects over time but not to a significant degree. The study has implications for the provision of pain management interventions for community-dwelling older adults with chronic pain.
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HIV-associated sensory neuropathy (HIV-SN) is the most frequent manifestation of HIV disease. It often presents with significant neuropathic pain and is associated with previous exposure to neurotoxic nucleoside reverse transcriptase inhibitors. However, HIV-SN prevalence remains high even in resource-rich settings where these drugs are no longer used. ⋯ Treatment with gabapentin, but not amitriptyline, was associated with a complete attenuation of hind paw mechanical hypersensitivity observed with indinavir treatment. Furthermore, we found a small but significant increase in microglia with the effector morphology in the lumbar spinal dorsal horn in indinavir-treated animals, coupled with significantly increased expression of phospho-p38 in microglia. In summary, we have reported neuropathic pain-related sensory and behavioural changes accompanied by a significant loss of hind paw skin sensory innervation in a rat model of indinavir-induced peripheral neuropathy that is suitable for further pathophysiological investigation and preclinical evaluation of novel analgesics.
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A comprehensive systematic literature review of reproductive side effects in women aged 18 to 55 years treated with opioids for 1 month or longer for chronic noncancer pain. A search of 7 databases including EMBASE and Medline was undertaken (October 2014 and a limited rerun April 2016). The search contained key words for opioids (generic and specific drug names) and side effects (generic and specific reproductive). ⋯ The evidence is however weak and the mode of administration, duration, type, and dose of opioid might influence associations. Although hormone levels were statistically significant in only 2 studies, women exhibited clinically important symptoms (decreased libido and altered menstrual cycle). Further investigation is required with larger cohorts and analysis of different delivery methods.