The Clinical journal of pain
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To explore the existence of subgroups in a cohort with chronic low back pain (n=294) based upon data from multiple psychological questionnaires, and profile subgroups on data from multiple dimensions. ⋯ Clinical implications relating to presentations of each cluster are postulated.
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To examine the acute effects of isometric exercise of different intensities on pain perception in individuals with chronic lateral epicondylalgia. ⋯ Individuals with lateral epicondylalgia demonstrated increased pain intensity after an acute bout of isometric exercise performed at an intensity above, but not below, their individual pain threshold. Further investigation is needed to determine whether measurement of an individual's exercise induced pain threshold may be important in reducing symptom flares associated with exercise.
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To apply topographical mapping of the electromyography (EMG) amplitude recorded from the upper trapezius muscle to evaluate the distribution of activity and the location of peak activity during a shoulder elevation task in participants with and without myofascial pain and myofascial trigger points (MTrP) and compare this location with the site of the MTrP. ⋯ People with myofascial pain and MTrP displayed a caudal shift of the distribution of upper trapezius muscle activity compared with asymptomatic individuals during a submaximal shoulder elevation task. For the first time, we show that the location of peak muscle activity is not associated with the location of the MTrP.
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Observational Study
The Association Between Chronic Pain and Cardiac Disease: A Cross-sectional Population Study.
Chronic pain may increase the risk of cardiac disease, but the extent to which confounding variables account for this association has yet to be satisfactorily established. This study aims to examine the possibility of an independent association between these 2 variables. ⋯ Patients reporting chronic pain, in particular those most severely affected, may be at significantly increased risk of cardiac disease. Future studies should focus on determining whether reducing the impact of chronic pain can improve cardiac health.
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To investigate the efficacy and safety of magnesium sulfate as an adjuvant of local anesthetics in perineural nerve blocks. ⋯ The present study suggests that combined magnesium sulfate and local anesthetics in perineural nerve blocks provided better analgesic efficacy. For it prolongs the postoperative duration time of analgesia, sensory and motor block without increasing the short-term side effects. Magnesium sulfate may be a promising analgesic for perineural nerve blocks, but further studies are required to validate our results.