The Clinical journal of pain
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Numerous experimental studies, conducted primarily over the past 10 years, show that there are sex differences in opioid analgesia. This review summarizes the published literature on sex differences in analgesia produced by acute administration of drugs acting at mu-, kappa-, and delta-opioid receptors, in animals and humans. Additionally, methodological issues in research into opioid sex differences are discussed. ⋯ Procedural variables that may influence the outcome of studies examining sex differences in opioid analgesia include modality and intensity of the noxious stimulus used in the pain test, opioid type (efficacy and selectivity), and experimental design and data analytic techniques. Subject variables that may be important to consider include subject genotype and gonadal steroid hormone state of the subject at the time of analgesia testing. Evidence is provided for multiple mechanisms underlying sex differences in opioid analgesia, including both pharmacokinetic and pharmacodynamic factors. Future research directions are suggested, such as examining sex differences in opioid tolerance development, sex differences in opioid analgesia using models of acute inflammatory pain and chronic pain, and sex differences in effects of opioids other than analgesia, which may limit their therapeutic use.
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The aim of this study is to describe the incidence and characteristics of pain, sensory abnormalities, abnormal body sweating, and pathologic gustatory sweating in pain patients with persistent post-sympathectomy pain. ⋯ The present study does not allow for conclusions about the effectiveness of surgical sympathectomy for neuropathic pain. However, our findings indicate that if the pain persists after the procedure, the complications may be quite serious and at times worse than the problem for which the surgery was originally performed.
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Clinical Trial
Challenges to early prevention and intervention: personal experiences with adherence.
To describe potential adherence-related difficulties encountered in the implementation of a secondary prevention, early intervention study with acute low back pain patients. An additional goal is to provide recommendations, based on the authors' experience, on how best to overcome these potential obstacles for future research. ⋯ Potential difficulties are discussed in the contextual framework of treatment adherence and factors affecting it, including the impact of personality factors, satisfaction, comprehension, side effects, financial issues, length of treatment, type of regimen, social issues, patient beliefs, and biologic factors. It is hoped that the present authors' experience will enable future investigators to anticipate these common problems, and structure their research endeavors accordingly.
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The causes of prolonged disability due to back pain are multiply determined, involving medical, social, and environmental factors. Possible solutions to the problem of prolonged back pain disability have emerged from recent research but few efforts have been made to transfer evidence-based programs to large community settings. ⋯ Phase A: Based on literature review and expert knowledge, the Sherbrooke model was developed and assessed through a population-based, randomized clinical trial. Results at 1-year follow-up showed quicker return to regular work and improvement of quality of life; the 6-year follow-up showed the cost-effectiveness of the method. Phase B: Based on the Sherbrooke model experience and recent evidence, a new program addressing the disability paradigm was developed and implemented in the province of Quebec (Canada). Results at 1- and 3-year follow-ups showed that only 24% of workers were not working owing to their musculoskeletal disorder. The program is presently being tested through a population-based, randomized clinical trial in a population of construction workers. Phase C: To implement the program at a provincial level, a network for management, research and education in work rehabilitation was developed. An external assessment is presently planned to evaluate return to work and economic outcomes and quality of implementation of the program in various settings.
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Randomized Controlled Trial Comparative Study Clinical Trial
Pain on injection of propofol: the effect of granisetron pretreatment.
To assess the effect of granisetron pretreatment in alleviating propofol injection pain. ⋯ Granisetron pretreatment may be used to reduce the incidence of pain on injection of propofol, an advantage added to the useful prevention of postoperative nausea and vomiting.