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  • 1.
    Bjorkman, Berit
    et al.
    Karolinska Institutet.
    Arner, Staffan
    Karolinska Institutet.
    Hyden , Lars-Christer
    Linköping University, Department of Medicine and Health Sciences, Health and Society. Linköping University, Faculty of Arts and Sciences.
    Phantom Breast and Other Syndromes After Mastectomy: Eight Breast Cancer Patients Describe Their Experiences Over Time2008In: Journal of Pain, ISSN 1526-5900, E-ISSN 1528-8447, Vol. 9, no 11, p. 1018-1025Article in journal (Refereed)
    Abstract [en]

    Patients often experience hard-to-treat neuropathic pain and other sensations after surgery; consequently, they could develop chronic pain conditions. The phantom limb phenomenon is a well-documented postoperative pain condition. However, phantom phenomena after mastectomies are less documented. The reviews report several views on the prevalence of breast phantoms and coexisting distress. Researchers observed that new methodological approaches might facilitate further research of these issues. This prospective, qualitative study used semistructured interviews to acquire knowledge of if and how phantom breast phenomena appear within the range of other postmastectomy symptoms and sensations. The study revealed that a phantom breast could be difficult to describe and position spatially. The phantom breast phenomenon varied from classic phantom extremity phenomenon and did not seem to cause much distress. However, it proved to be a phenomenon so unknown and different that there is urgent need for more knowledge. This study highlights the importance of further investigation regarding how information and communication related to a phantom breast might be developed.

    Perspective: The phantom breast is only one piece of a complicated puzzle. Because it was relatively unknown for the women in the study, it is important that analyses of this phenomenon, as a part of a postmastectomy syndrome, be conducted in a dialogue with the patients, by scientifically using qualitative methods.

  • 2. Craig, AD
    et al.
    Blomqvist, Anders
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Biomedicine and Surgery, Cell biology.
    Is there a specific lamina I spinothalamocortical pathway for pain and temperature sensations in primates?2002In: Journal of Pain, ISSN 1526-5900, E-ISSN 1528-8447, Vol. 3, no 2Article in journal (Refereed)
    Abstract [en]

    [No abstract available]

  • 3.
    Rovner, Graciela
    et al.
    Karolinska Institute, Sweden; University of Gothenburg, Sweden; SmartRehab, Sweden; Karolinska Institute, Sweden.
    Vowles, Kevin E.
    University of New Mexico, NM 87131 USA.
    Gerdle, Björn
    Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Anaesthetics, Operations and Specialty Surgery Center, Pain and Rehabilitation Center.
    Gillanders, David
    University of Edinburgh, Scotland.
    Latent Class Analysis of the Short and Long Forms of the Chronic Pain Acceptance Questionnaire: Further Examination of Patient Subgroups2015In: Journal of Pain, ISSN 1526-5900, E-ISSN 1528-8447, Vol. 16, no 11, p. 1095-1105Article in journal (Refereed)
    Abstract [en]

    A substantial literature indicates that pain acceptance is a useful behavioral process in chronic pain rehabilitation. Pain acceptance consists of willingness to experience pain and to engage in important activities even in the presence of pain and is often measured using the Chronic Pain Acceptance Questionnaire (CPAQ). Previous traditional cluster analyses of the 20-item CPAQ identified 3 patient clusters that differed across measures of patient functioning in meaningful ways. The aims of this study were to replicate the previous study in a new sample, using the more robust method of latent class analysis (LCA), and to compare the cluster structure of the CPAQ and the shorter CPAQ-8. In total, 914 patients with chronic pain completed the CPAQ and a range of measures of psychological and physical function. Patient clusters identified via LCA were then used to compare patients across functional measures. Contrary to previous research, LCA demonstrated that a 4-cluster structure was superior to a 3-cluster structure. Consistent with previous research, cluster membership based on patterns of pain willingness and activity engagement was significantly associated with specific patterns of psychological and physical function, in line with theoretical predictions. These cluster structures were similar for both CPAQ-20 and CPAQ-8 items. These results provide further evidence of the relevance of chronic pain acceptance, and a more nuanced understanding of how the components of acceptance are related to function. Perspective: Pain acceptance is important in chronic pain. The findings of the present study, which included 914 individuals with chronic pain, provide support for 4 discrete groups of patients based on levels of acceptance (low, medium, and high), as well as a group with a high level of activity engagement and low willingness to have pain. These groups appear statistically robust and differed in predictable ways across measures of functioning. (C) 2015 by the American Pain Society

  • 4.
    Samir Samour, Mohamad
    et al.
    University of Western Sydney, Australia.
    Nagi Saulat, Saad
    Linköping University, Department of Clinical and Experimental Medicine, Center for Social and Affective Neuroscience. Linköping University, Faculty of Medicine and Health Sciences. University of Western Sydney, Australia.
    Shortland, Peter John
    Western Sydney University, Australia.
    Mahns, David Anthony
    University of Western Sydney, Australia.
    Minocycline Prevents Muscular Pain Hypersensitivity and Cutaneous Allodynia Produced by Repeated Intramuscular Injections of Hypertonic Saline in Healthy Human Participants2017In: Journal of Pain, ISSN 1526-5900, E-ISSN 1528-8447, Vol. 18, no 8, p. 994-1005Article in journal (Refereed)
    Abstract [en]

    Minocycline, a glial suppressor, prevents behavioral hypersensitivities in animal models of peripheral nerve injury. However, clinical trials of minocycline in human studies have produced mixed results. This study addressed 2 questions: can repeated injections of hypertonic saline (HS) in humans induce persistent hypersensitivity? Can pretreatment with minocycline, a tetracycline antibiotic with microglial inhibitory effects, prevent the onset of hypersensitivity? Twenty-seven healthy participants took part in this double-blind, placebo-controlled study, consisting of 6 test sessions across 2 weeks. At the beginning of every session, pressure-pain thresholds of the anterior muscle compartment of both legs were measured to determine the region distribution and intensity of muscle soreness. To measure changes in thermal sensitivity in the skin overlying the anterior muscle compartment of both legs, quantitative sensory testing was used to measure the cutaneous thermal thresholds (cold sensation, cold pain, warm sensation, and heat pain) and a mild cooling stimulus was applied to assess the presence of cold allodynia. To induce ongoing hypersensitivity, repeated injections of HS were administered into the right tibialis anterior muscle at 48-hour intervals. In the final 2 sessions (days 9 and 14), only sensory assessments were done to plot the recovery after cessation of HS administrations and drug washout. By day 9, nontreated participants experienced a significant bilateral increase in muscle soreness (P amp;lt; .0001), accompanied by the emergence of bilateral cold allodynia in 44% of participants, thus confirming the effectiveness of the model. Placebo-treated participants experienced a bilateral 35% alleviation in muscle soreness (P amp;lt; .0001), with no changes to the prevalence of cold allodynia. In contrast, minocycline-treated participants experienced a bilateral 70% alleviation in muscle soreness (P amp;lt; .0001), additionally, only 10% of minocycline-treated participants showed cold allodynia. This study showed that repeated injections of HS can induce a hypersensitivity that outlasts the acute response, and the development of this hypersensitivity can be reliably attenuated with minocycline pretreatment. Perspective: Four repeated Injections of HS at 48-hour intervals induce a state of persistent hypersensitivity in healthy human participants. This hypersensitivity was characterized by bilateral muscular hyperalgesia and cutaneous cold allodynia, symptoms commonly reported in many chronic pain conditions. Minocycline pretreatment abolished the development of this state. Crown Copyright (C) 2017 Published by Elsevier Inc. on behalf of the American Pain Society

  • 5.
    Stening, Kent
    et al.
    Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
    Berg, Göran
    Linköping University, Department of Clinical and Experimental Medicine, Obstetrics and gynecology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Paediatrics and Gynecology and Obstetrics, Department of Gynecology and Obstetrics in Linköping.
    Hammar, Mats
    Linköping University, Department of Clinical and Experimental Medicine, Obstetrics and gynecology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Paediatrics and Gynecology and Obstetrics, Department of Gynecology and Obstetrics in Linköping.
    Voster, Helene
    Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
    Eriksson, Olle
    Linköping University, Department of Computer and Information Science, Statistics. Linköping University, Faculty of Arts and Sciences.
    Amandusson, Åsa
    Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
    Blomqvist, Anders
    Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
    Influence of estrogen levels on thermal perception, pain thresholds and pain tolerance: Studies on women undergoing in vitro fertilization2012In: Journal of Pain, ISSN 1526-5900, E-ISSN 1528-8447, Vol. 13, no 5, p. 459-466Article in journal (Refereed)
    Abstract [en]

    We examined the relationship between estrogen and pain in women undergoing in vitro fertilization (IVF). Quantitative sensory tests (QST) were performed twice during the IVF-regimen: once during hormonal down-regulation and once during hormonal upregulation. A group of healthy men and a group of women using monophasic contraceptives were also examined, to control for session-to-session effects. Among the women undergoing IVF, serum 17β-estradiol levels differed strongly between treatments as expected, and increased from 65.7 (SD = 26) pmol/l during the downregulation phase, to 5188 (SD = 2524) pmol/l during the up-regulation phase. Significant outcomes in the QST were only seen for temperature perception thresholds (1.7°C vs. 2.2°C; P = 0.003) and cold pain threshold (11.5°C vs. 14.5°C; P = 0.04). A similar change in cold pain threshold was also seen in the two control groups, however, and statistical analysis suggested that this change was due to a session-to-session effect rather than being the result of hormonal modulation. Heat pain thresholds, heat tolerance, pressure pain thresholds, and the cold pressor test showed no significant differences between sessions. These data demonstrate that pain perception and pain thresholds in healthy women show little, if any, changes even with major variations in serum estradiol levels.

  • 6.
    Stensson, Niclas
    et al.
    Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Anaesthetics, Operations and Specialty Surgery Center, Pain and Rehabilitation Center.
    Ghafouri, Nazdar
    Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Anaesthetics, Operations and Specialty Surgery Center, Pain and Rehabilitation Center.
    Ernberg, Malin
    Karolinska Inst, Sweden; Scandinavian Ctr Orofacial Neurosci, Sweden.
    Mannerkorpi, Kaisa
    Univ Gothenburg, Sweden.
    Kosek, Eva
    Karolinska Inst, Sweden; Lowenstromska Hosp, Sweden.
    Gerdle, Björn
    Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Anaesthetics, Operations and Specialty Surgery Center, Pain and Rehabilitation Center.
    Ghafouri, Bijar
    Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Anaesthetics, Operations and Specialty Surgery Center, Pain and Rehabilitation Center.
    The Relationship of Endocannabinoidome Lipid Mediators With Pain and Psychological Stress in Women With Fibromyalgia: A Case-Control Study2018In: Journal of Pain, ISSN 1526-5900, E-ISSN 1528-8447, Vol. 19, no 11, p. 1318-1328Article in journal (Refereed)
    Abstract [en]

    Characterized by chronic widespread pain, generalized hyperalgesia, and psychological stress, fibromyalgia (FM) is difficult to diagnose and lacks effective treatments. Endocannabinoids arachidonoylethanolamide (AEA), 2-arachidonoylglycerol (2-AG), and the related oleoylethanolamide (OEA), palmitoylethanolamide (PEA), and stearoylethanolamide (SEA) are endogenous lipid mediators with analgesic and anti-inflammatory characteristics, in company with psychological modulating properties (eg, stress and anxiety), and are included in a new emerging "ome," the endocannabinoidome. This case-control study compared the concentration differences of AEA, OEA, PEA, SEA, and 2 AG in 104 women with FM and 116 healthy control subjects. All participants rated their pain, anxiety, depression, and current health status. The relationships between the lipid concentrations and the clinical assessments were investigated using powerful multivariate data analysis and traditional bivariate statistics. The concentrations of OEA, PEA, SEA, and 2-AG were significantly higher in women with FM than in healthy control subjects; significance remained for OEA and SEA after controlling for body mass index and age. 2-AG correlated positively with FM duration and body mass index, and to some extent negatively with pain, anxiety, depression, and health status. In FM, AEA correlated positively with depression ratings. The elevated circulating levels of endocannabinoidome lipids suggest that these lipids play a role in the complex pathophysiology of FM and might be signs of ongoing low-grade inflammation in FM. Although the investigated lipids are significantly altered in FM, their biological roles are uncertain with respect to the clinical manifestations of FM. Thus plasma lipids alone are not good biomarkers for FM. Perspective: This study reports about elevated plasma levels of endocannabinoidome lipid mediators in FM. The lipids suitability to work as biomarkers for FM in the clinic were low; however, their altered levels indicate that a metabolic asymmetry is ongoing in FM, which could serve as a baseline during explorative FM pain management. (C) 2018 by the American Pain Society

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