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European Journal of Pain: EJP

W Xia, C D Mørch, D Matre, O K Andersen
BACKGROUND: This study aimed to explore conditioned pain modulation (CPM) effect on long-term potentiation (LTP)-like pain amplification induced by cutaneous 10-Hz conditioning electrical stimulation (CES). METHODS: Conditioned pain modulation was induced by cold pressor conditioning stimulus (CPCS) (4 °C) which was applied immediately before CES in the active session. In the control session, water with a temperature of 32 °C was used. Twenty subjects participated in two sessions in a randomized crossover design with at least 1-week interval...
October 20, 2016: European Journal of Pain: EJP
D Reiss, R A Ceredig, T Secher, J Boué, F Barreau, G Dietrich, C Gavériaux-Ruff
BACKGROUND: Opiates act through opioid receptors to diminish pain. Here, we investigated whether mu (MOR) and delta (DOR) receptor endogenous activity assessed in the whole mouse body or in particular at peripheral receptors on primary nociceptive neurons, control colonic pain. METHODS: We compared global MOR and DOR receptor knockout (KO) mice, mice with a conditional deletion of MOR and DOR in Nav1.8-positive nociceptive primary afferent neurons (cKO), and control floxed mice of both genders for visceral sensitivity...
October 17, 2016: European Journal of Pain: EJP
A Rosén, J Yi, I Kirsch, T J Kaptchuk, M Ingvar, K B Jensen
BACKGROUND: Expectancy is widely accepted as a key contributor to placebo effects. However, it is not known whether non-conscious expectancies achieved through semantic priming may contribute to placebo analgesia. In this study, we investigated if an implicit priming procedure, where participants were unaware of the intended priming influence, affected placebo analgesia. METHODS: In a double-blind experiment, healthy participants (n = 36) were randomized to different implicit priming types; one aimed at increasing positive expectations and one neutral control condition...
October 17, 2016: European Journal of Pain: EJP
O M S Fredheim, S Brelin, M J Hjermstad, J H Loge, N Aass, T B Johannesen, S Skurtveit
BACKGROUND: Even though validation studies of the WHO analgesic ladder have indicated that the simple approach of the analgesic ladder can provide adequate pain control in most patients, prevalence studies have documented a high prevalence of pain in cancer patients. Little is known about how analgesics are actually prescribed for cancer pain. The aim of the study was to study prescriptions of analgesics during the entire disease trajectory in patients dying from cancer within five years of diagnosis...
October 14, 2016: European Journal of Pain: EJP
R Whittle, G Mansell, P Jellema, D van der Windt
BACKGROUND: Many randomized controlled trials (RCTs) of psychosocial interventions for low back pain (LBP) have been found to have only small effects on disability outcomes. Investigations of the specific mechanisms that may lead to an improvement in outcome have therefore been called for. METHODS: We present an application of the causal inference approach to mediation analysis using the example of a cluster RCT in a primary care population with (sub)acute LBP randomized to either usual GP care (n = 171) or a minimal psychosocial intervention (n = 143)...
October 14, 2016: European Journal of Pain: EJP
G P Bostick, S J Kamper, T M Haanstra, B D Dick, L W Stitt, P Morley-Forster, A J Clark, M E Lynch, A Gordon, H Nathan, C Smyth, M A Ware, C Toth, D E Moulin
BACKGROUND: Pain expectancy may be an important variable that has been found to influence the effectiveness of treatments for pain. Much of the literature supports a self-fulfilment perspective where expectations for pain relief predict the actual pain experienced. However, in conditions such as neuropathic pain (NeP) where pain relief is difficult to attain, expectations for pain relief could be unrealistic. The objective of this study was to investigate the relationship between realistic/unrealistic expectations and 6-month, post-treatment outcomes...
October 14, 2016: European Journal of Pain: EJP
W Ma, B St-Jacques, U Rudakou, Y N Kim
BACKGROUND: Persistent peripheral sensitization contributes to chronic pain. Plasticity of nociceptive dorsal root ganglion (DRG) neurons (nociceptors) induced by pro-inflammatory mediators contributes to sensitization. Prostaglandin E2 (PGE2) enriched in injured tissues is known not only directly to sensitize DRG neurons, but also to potentiate sensitizing effects of other pain mediators such as capsaicin and its receptor transient receptor potential vanilloid-1 (TRPV1). It remains unknown whether PGE2 potentiates TRPV1 activity by stimulating its synthesis, cell surface and axonal trafficking in DRG neurons...
October 14, 2016: European Journal of Pain: EJP
M Sobol-Kwapinska, W Plotek, P Bąbel, M Cybulski, A Kluzik, J Krystianc, M Mandecki
BACKGROUND: The aim of this study was to predict acute postsurgical pain and coping with pain following surgery based on preoperative time perspectives. Time perspective is a basic dimension of psychological time. It is a tendency to focus on a particular time area: the past, the present and the future. METHOD: Seventy-six patients completed measures of time perspective and pain 24 h before abdominal surgery. During the 3 days after surgery, measures of pain and coping with pain were completed...
October 13, 2016: European Journal of Pain: EJP
C W J van Tilburg, D L Stronks, J G Groeneweg, F J P M Huygen
BACKGROUND: Investigate the effect of percutaneous radiofrequency compared to a sham procedure, applied to the ramus communicans for treatment of lumbar disc pain. METHODS: Randomized sham-controlled, double-blind, crossover, multicenter clinical trial. Multidisciplinary pain centres of two general hospitals. Sixty patients aged 18 or more with medical history and physical examination suggestive for lumbar disc pain and a reduction of two or more on a numerical rating scale (0-10) after a diagnostic ramus communicans test block...
October 13, 2016: European Journal of Pain: EJP
A Shohet, A Khlebtovsky, N Roizen, Y Roditi, R Djaldetti
BACKGROUND: Cannabis can alleviate pain of various etiologies. This study assessed the effect of cannabis on motor symptoms and pain parameters in patients with Parkinson's disease (PD). METHODS: Twenty patients with PD who were licensed to use cannabis underwent evaluation before and 30 min after cannabis consumption and again after long-term use. Motor function was assessed with the Unified PD Rating scale (UPDRS) by two raters, one blinded. Pain was assessed with the Pain Rating Index (PRI) and Visual Analogue Scale (VAS) of the short-form McGill Pain Questionnaire...
October 10, 2016: European Journal of Pain: EJP
B E Brito, E Vazquez, P Taylor, Y Alvarado, H Vanegas, A Millan, V Tortorici
BACKGROUND: Opioid effectiveness to treat cancer pain is often compromised by the development of tolerance and the occurrence of undesirable side effects, particularly during long-term treatment. Hence, the search for more efficient analgesics remains a necessity. The main goal of this study was to relieve neuropathic symptoms associated with tumour growth by administering the non-opioid analgesic dipyrone (DIP) alone or in combination with magnesium chloride (MgCl2 ), an adjuvant that blocks the NMDA receptor channel...
October 10, 2016: European Journal of Pain: EJP
E T Maas, J N S Juch, R W J G Ostelo, J G Groeneweg, J W Kallewaard, B W Koes, A P Verhagen, F J P M Huygen, M W van Tulder
: Patient history and physical examination are frequently used procedures to diagnose chronic low back pain (CLBP) originating from the facet joints, although the diagnostic accuracy is controversial. The aim of this systematic review is to determine the diagnostic accuracy of patient history and/or physical examination to identify CLBP originating from the facet joints using diagnostic blocks as reference standard. We searched MEDLINE, EMBASE, CINAHL, Web of Science and the Cochrane Collaboration database from inception until June 2016...
October 10, 2016: European Journal of Pain: EJP
N Kriek, J G Groeneweg, D L Stronks, D de Ridder, F J P M Huygen
BACKGROUND: Conventional tonic spinal cord stimulation (SCS) is an effective treatment for patients with therapy-resistant complex regional pain syndrome (CRPS). Although the therapeutic effect of SCS can diminish over time due to tolerance, pain control can be regained by changing the pulse width and the amplitude and/or by increasing the stimulation frequency. This multicentre, double-blind, randomized and placebo-controlled crossover trial was conducted to investigate whether more effective pain reduction is achieved with different frequencies (trial registration, current controlled trials, ISRCTN 36655259)...
October 7, 2016: European Journal of Pain: EJP
J J Wong, P Côté, D A Sutton, K Randhawa, H Yu, S Varatharajan, R Goldgrub, M Nordin, D P Gross, H M Shearer, L J Carroll, P J Stern, A Ameis, D Southerst, S Mior, M Stupar, T Varatharajan, A Taylor-Vaisey
: We conducted a systematic review of guidelines on the management of low back pain (LBP) to assess their methodological quality and guide care. We synthesized guidelines on the management of LBP published from 2005 to 2014 following best evidence synthesis principles. We searched MEDLINE, EMBASE, CINAHL, PsycINFO, Cochrane, DARE, National Health Services Economic Evaluation Database, Health Technology Assessment Database, Index to Chiropractic Literature and grey literature. Independent reviewers critically appraised eligible guidelines using AGREE II criteria...
October 6, 2016: European Journal of Pain: EJP
P Okkerse, R Alvarez-Jimenez, J L Hay, A Tehim, R Kumar, M L de Kam, G J Groeneveld
BACKGROUND: Serotonin-norepinephrine reuptake inhibitors inhibit the reuptake of serotonin and noradrenalin and are used in the treatment of neuropathic pain. Animal studies suggest that milnacipran co-administered with opioids may potentiate the analgesic effect of μ-opioid receptor agonists. This study hypothesized that co-administration of milnacipran and buprenorphine would have a synergistic effect in evoked pain models in healthy subjects. METHODS: This was a randomized double-blinded, placebo-controlled, four-way cross-over, multiple dose clinical trial to investigate the analgesic effects of buprenorphine (placebo, 0...
September 21, 2016: European Journal of Pain: EJP
V Speck, T Schlereth, F Birklein, C Maihöfner
BACKGROUND: Although specific psychological disorders in complex regional pain syndrome (CRPS) have not been identified, studies suggest that CRPS patients may have increased rates of traumatic life events. Because these events do not always lead to apparent psychological symptoms, we systematically screened CRPS patients for posttraumatic stress disorder (PTSD) to determine if PTSD could be a risk factor for CRPS. METHODS: Consecutive CRPS patients referred to two university hospital centres (University of Erlangen, UMC Mainz) between December 2011 and April 2013 were prospectively examined using a diagnostic PTSD instrument (Post-traumatic Stress Diagnostic Scale (PDS)...
September 21, 2016: European Journal of Pain: EJP
T K Munkholm, L Arendt-Nielsen
BACKGROUND: Tissue pH is lowered in inflamed tissues, and the increased proton concentration activates acid-sensing ion channels (ASICs), contributing to pain and hyperalgesia. ASICs can be upregulated by nerve growth factor (NGF). The aim of this study was to investigate two new human experimental pain models combining NGF- and acid-induced pain in a randomized, controlled, double-blind study. METHODS: In experiment 1, volunteers (N = 16) received an injection of either NGF or isotonic saline in each infrapatellar fat pad (IFP)...
September 15, 2016: European Journal of Pain: EJP
K Wagner, K S S Lee, J Yang, B D Hammock
BACKGROUND: Neuropathic pain is a debilitating condition with no adequate therapy. The health benefits of omega-3 fatty acids are established, however, the role of docosahexaenoic acid (DHA) in limiting pain has only recently been described and the mechanisms of this action remain unknown. DHA is metabolized into epoxydocosapentanoic acids (EDPs) via cytochrome P450 (CYP450) enzymes which are substrates for the soluble epoxide hydrolase (sEH) enzyme. Here, we tested several hypotheses; first, that the antinociceptive action of DHA is mediated by the EDPs...
September 15, 2016: European Journal of Pain: EJP
A A Ayorinde, S Bhattacharya, K L Druce, G T Jones, G J Macfarlane
BACKGROUND: Epidemiological studies on chronic pelvic pain (CPP) have focused on women of reproductive age. We aimed to determine the prevalence of chronic pelvic pain (CPP) in adult women and the differences in associated factors among women of reproductive age and older women. In addition, to determine whether distinct subgroups existed among CPP cases. METHODS: A cross-sectional postal survey was conducted among 5300 randomly selected women aged ≥25 years resident in the Grampian region, UK...
September 15, 2016: European Journal of Pain: EJP
A J A Köke, R J E M Smeets, K M Schreurs, B van Baalen, P de Haan, S C Remerie, H R Schiphorst Preuper, M F Reneman
BACKGROUND: No core set of measurement tools exists to collect data within clinical practice. Such data could be useful as reference data to guide treatment decisions and to compare patient characteristics or treatment results within specific treatment settings. METHODS: The Dutch Dataset Pain Rehabilitation was developed which included the six domains of the IMMPACT core set and three new domains relevant in the field of rehabilitation (medical consumption, patient-specific goals and activities/participation)...
September 15, 2016: European Journal of Pain: EJP
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