The Clinical journal of pain
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There has been increased recognition of calcineurin, a phosphoprotein serine/threonine phosphatase enzyme, in the regulation of many physiologic systems. Calcineurin mediates activation of lymphocytes, which play a role in immune response. Widely distributed in the central nervous system, calcinuerin also plays an important role in sensory neural function, via its role in the regulation of newly discovered 2-pore potassium channels, which greatly influence neuronal resting membrane potentials. Calcinuerin inhibition is the mechanism of action of immunomodulatory drugs such as cyclosporine and tacrolimus, which are widely used in transplantation medicine to prevent rejection. While important for immunosuppression, the use of calcineurin inhibitors has been associated with the development of a new pain syndrome called the calcineurin pain syndrome, which appears to be an untoward complication of the interruption of the physiologic function of calcineurin. ⋯ The calcineurin syndrome is a newly recognized complication associated with the use of calcineurin inhibitors. There is no standard therapy at this time but anecdotal reports suggest the effectiveness of calcium channel blockers.
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Anxiety sensitivity (AS) is the fear of anxiety-related sensations and its perceived harmful consequences. AS is associated with enhanced pain and worsened pain outcomes, suggesting it is a contributing factor in acute and chronic pain. However, the mechanisms that mediate the relationship between AS and pain are currently unknown. This study assessed the relationship between AS and 2 measures of spinal nociceptive processes (ie, nociceptive flexion reflex and temporal summation of nociceptive flexion reflex) and measures of subjective pain. This allowed us to determine whether AS engages descending cerebrospinal processes to facilitate pain signaling at spinal levels. ⋯ Given that AS was not significantly associated with measures of spinal nociception, these results suggest that AS may exert its influence on pain processing at the supraspinal, rather than the spinal level.
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Emerging research suggests that perceptions of injustice after musculoskeletal injury can have a significant impact on a number of pain-related outcomes. ⋯ Perceived injustice appears to be associated with problematic health and mental health recovery trajectories after the onset of a pain condition. Future directions for research and treatment are addressed.
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Review Meta Analysis
Systematic review of the quality and generalizability of studies on the effects of opioids on driving and cognitive/psychomotor performance.
The effect of opioids on driving performance has been much debated. Driving is a complex task requiring integration of psychomotor, cognitive, motor and decision-making skills, visual-spatial abilities, divided attention, and behavioral and emotional control. The objective of this systematic review was to assess the quality of studies and to revisit the concept that patients on stable opioids are safe to drive as it applies to everyday practice. ⋯ The commonly held concept that "chronic pain patients on stable opioids are safe to drive" cannot be generalized to all such patients in everyday practice, but may be applicable only to a subset who meet certain criteria.