The journal of pain : official journal of the American Pain Society
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Studies in adults have shown that the effects of pain catastrophizing upon others vary from positive to negative responses. There are no studies, however, on the impact of catastrophizing in children upon responses of others. In addition, little is known about why catastrohpizing varies with both positive and negative responses. Attachment may be one important moderator explaining these variable relationships. The present study in 1,332 school children investigated, by means of child-report questionnaires, the relationships between pain catastrophizing and parental responses to pain, and the moderating role of child attachment. Findings indicated that a child's pain catastrophizing had a small but significant positive contribution in explaining child reports of both positive and negative parental responses to pain. However, this relationship was moderated by child attachment; for less securely attached children, higher levels of catastrophizing were associated with more negative parental responses. On the contrary, for more securely attached children, higher levels of catastrophizing were associated with more positive parental responses. The present findings suggest that child attachment may partially explain the variable results regarding the impact of pain catastrophizing upon others' responses. The findings are discussed in terms of the function of pain catastrophizing in interactional processes between parents and children. ⋯ This study in schoolchildren found preliminary evidence for the moderating impact of child attachment in understanding differential patterns of parental responses related to the child's pain catastrophizing. Further exploration of the mechanisms relating catastrophizing and attachment processes might contribute to a better comprehension of the interpersonal nature of pain catastrophizing.
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The Pain Management Index (PMI) is used to assess pain medication adequacy in black and white chronic pain patients (18-50 years) at referral to tertiary pain care. Using WHO guidelines for pain treatment, PMI was calculated from pain severity and drug analgesic potency. From 183 patients recruited, 128 provided treatment information for analyses (53% white, 60% female). Most (51.6%) had adequate PMI. Blacks were prescribed fewer pain medications (P = .03); fewer women had adequate medication strength (P = .04). In hierarchical regression, PMI was predicted at entry by female gender, lower MPI, higher affective MPQ, and a gender X age interaction. Younger men experienced better pain management, reducing toward the PMI level of women by age 50. In the final block, black race, being married, affective pain, and gender X age were associated with higher PMI, female gender and being employed were associated with lower PMI. Women, particularly younger women, were at higher risk for inadequate pain management in a primary care environment. These results support variability in chronic pain care and the need for research focusing on whether these disparities persist with specialized pain care. ⋯ Most people with pain receive initial care in a primary care setting. This study examining the adequacy of pain management prior to specialty pain care showed blacks and women had less adequate pain care at referral. These results suggest the need for interventions and education in the primary care arena to improve pain care.
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Comparative Study
Comparison of the cold pressor test and contact thermode-delivered cold stimuli for the assessment of cold pain sensitivity.
Sensitivity to suprathreshold cold pain stimuli constitutes an important part of comprehensive pain sensitivity testing and can be assessed by the cold pressor test or by using a contact thermode-based testing device. One major difference between the 2 methods is the size of the surface area stimulated, which is thought to affect both recruitment of endogenous pain control mechanisms and vasomotor reactions. It is therefore not clear if the 2 methods can be used interchangeably for the assessment of cold pain. Here we applied 60-second-long stimuli at approximately 3 degrees C to the hands of 47 subjects by both methods. Pain intensity ratings (on a scale from 0 to 10) were significantly higher in the cold pressor test than in the thermode cold test (6.3 +/- 1.8 vs 3.9 +/- 2), associated with a higher rate of dropouts within the 60 seconds (64 vs 11%). Nonetheless, pain intensity ratings obtained with both methods were highly correlated (r = .70). However, the thermode cold test shared a larger amount of variance with 1 or more of the other pain intensity rating tests (phasic and tonic heat, pinprick) than the cold pressor test (53% vs 30%) while the cold pressor test contained a larger proportion of unique variance (39 vs 26%). ⋯ This article compares 2 methods of cold pain assessment in humans and analyzes their relationship to heat and pinprick pain. It could help researchers select the appropriate cold pain test for their study. It may also promote our understanding of commonalities and differences between different pain modalities.
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Intramuscular injection of hypertonic saline produces a dull ache that is felt in the muscle belly but also often refers into distal structures. We have previously observed in 2 subjects that the pattern of pain referral alters during painful stimuli separated by a week. In this investigation, we tested the hypothesis that the intensity and area of pain in the local and referred regions exhibits plasticity when an identical noxious stimulus is delivered to the same site over sequential trials. Bolus 1 mL intramuscular injections of 5% hypertonic saline were made into the same site of the tibialis anterior (TA) muscle on the same day each week for 4 consecutive weeks. Twenty-one subjects mapped the areas of local and referred pain and rated the intensities on a visual analog scale every 30 seconds until the cessation of pain. Over 4 weeks there was a progressive reduction in the area and intensity of local pain and a reciprocal increase in the expression of referred pain. We conclude that the decrease in perceived local pain and increase in perceived referred pain reflects plastic processes occurring centrally. ⋯ What happens to the intensity of pain induced by repeated noxious stimuli over time? Does it stay the same, increase or decrease? Here we show that weekly injections of hypertonic saline into the tibialis anterior cause decreases in local but increases in referred pain, suggesting central changes in processing noxious inputs.
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Ambiguous or blunted responses to sensory and painful stimuli among individuals with severe intellectual disabilities and comorbid communicative impairments put them at risk for having their experience of pain discounted and their expression of pain misinterpreted. Valid measurement procedures of behavioral expression are critical for this vulnerable group of individuals. We investigated a sham-controlled sensory-testing protocol as an approach to guard against observer bias during nonverbal behavioral recording for individuals with intellectual disabilities. Participants were 44 (52% male) adults (mean age = 46, sd = 10) with moderate (14%) and severe to profound (86%) intellectual impairment. The facial behavior of the participants before, during, and after 5 sensory-stimulation modalities (pin prick, light touch, deep pressure, cool, warm) was coded by 3 raters using the Facial Action Coding System (FACS). For each participant, the 5 active sensory trials were randomized with sham trials during which no stimulation was applied. Observers were blinded to active vs sham stimulation status. FACS scores increased significantly during active sensory trials (P < .05) compared with sham trials. There were significant effects for gender, with females more expressive than males (P < .05). There were also significant effects for the presence of self-injurious behavior (SIB), with individuals with SIB more expressive than individuals without SIB (P < .05). The results suggest that the procedure was valid (ie, distinguished between active vs sham sensory stimulation) and provides additional evidence that individuals with significant intellectual impairments are sensitive to tactile stimulation consistent with quantitative sensory-testing protocols. ⋯ This article presents a novel application of a modified approach to quantitative sensory testing for nonverbal adults with intellectual and developmental disabilities. This approach could be important in helping determine sensory issues related to tactile and nociceptive processes among a highly vulnerable group of individuals.