Articles: pain-threshold.
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Anesthesia and analgesia · Aug 2014
ReviewThe Effectiveness of Interventions Aimed at Reducing Anxiety in Health Care Waiting Spaces: A Systematic Review of Randomized and Nonrandomized Trials.
Reducing waiting anxiety is an important objective of patient-centered care. Anxiety is linked to negative health outcomes, including longer recovery periods, lowered pain thresholds, and for children in particular, resistance to treatment, nightmares, and separation anxiety. The goals of this study were (1) to systematically review published research aimed at reducing preprocedural waiting anxiety, and (2) to provide directions for future research and development of strategies to manage preprocedural waiting anxiety in health care environments. ⋯ Music is a well-established means of decreasing anxiety in adult patients awaiting medical interventions. The effect of music on children's anxiety is not known. Limited studies and heterogeneity of interventions and methods in the areas of aromatherapy, interior design, digital media, and play opportunities (for children) suggest the need for future research.
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Ketamine, in subanesthetic doses, produces systemic analgesia in chronic pain settings, an action largely attributed to block of N-methyl-D-aspartate receptors in the spinal cord and inhibition of central sensitization processes. N-methyl-D-aspartate receptors also are located peripherally on sensory afferent nerve endings, and this provided the initial impetus for exploring peripheral applications of ketamine. Ketamine also produces several other pharmacological actions (block of ion channels and receptors, modulation of transporters, anti-inflammatory effects), and while these may require higher concentrations, after topical (e.g., as gels, creams) and peripheral application (e.g., localized injections), local tissue concentrations are higher than those after systemic administration and can engage lower affinity mechanisms. ⋯ In controlled trials of neuropathic pain with topical ketamine combinations, there were improvements in some outcomes, but optimal dosing and drug combinations were not clear. Given orally (as a gargle, throat swab, localized peritonsillar injections), ketamine produced significant oral/throat analgesia in controlled trials in postoperative settings. Topical analgesics are likely more effective in particular conditions (patient factors, disease factors), and future trials of topical ketamine should include a consideration of factors that could predispose to favorable outcomes.
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Quantitative sensory testing (QST), with thermal threshold determinations, is a routine part of the comprehensive clinical workup of patients suffering from chronic pain, especially those with Complex Regional Pain Syndrome seen at our outpatient pain clinic. This is done to quantitatively assess each patient's small fiber and sensory function in a controlled manner. Most patients have normal sensory detection thresholds, but there are large differences in thermal pain thresholds. Some patients display no thermal hyperalgesia, while other patients display severe thermal hyperalgesia when tested in all 4 limbs. ⋯ Thermal QST provides useful information about the sensory phenotype of individual patients. Subgrouping based on thermal hyperalgesia may be useful for future studies regarding prognosis, treatment selection, and efficacy.