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European Journal of Pain: EJP

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https://www.readbyqxmd.com/read/27896907/efficacy-acceptability-and-safety-of-guided-imagery-hypnosis-in-fibromyalgia-a-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#1
REVIEW
N Zech, E Hansen, K Bernardy, W Häuser
: This systematic review aimed at evaluating the efficacy, acceptability and safety of guided imagery/hypnosis (GI/H) in fibromyalgia. Cochrane Library, MEDLINE, PsycINFO and SCOPUS were screened through February 2016. Randomized controlled trials (RCTs) comparing GI/H with controls were analysed. Primary outcomes were ≥50% pain relief, ≥20% improvement of health-related quality of life, psychological distress, disability, acceptability and safety at end of therapy and 3-month follow-up...
November 29, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27891705/spinal-cord-stimulation-in-experimental-chronic-painful-diabetic-polyneuropathy-delayed-effect-of-high-frequency-stimulation
#2
M van Beek, M van Kleef, B Linderoth, S M J van Kuijk, W M Honig, E A Joosten
BACKGROUND: Spinal cord stimulation (SCS) has been shown to provide pain relief in painful diabetic polyneuropathy (PDPN). As the vasculature system plays a great role in the pathophysiology of PDPN, a potential beneficial side-effect of SCS is peripheral vasodilation, with high frequency (HF) SCS in particular. We hypothesize that HF-SCS (500 Hz), compared with conventional (CON) or low frequency (LF)-SCS will result in increased alleviation of mechanical hypersensitivity in chronic experimental PDPN...
November 28, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27891703/an-investigation-into-the-inhibitory-function-of-serotonin-in-diffuse-noxious-inhibitory-controls-in-the-neuropathic-rat
#3
K Bannister, S Lockwood, L Goncalves, R Patel, A H Dickenson
BACKGROUND: Following neuropathy α2-adrenoceptor-mediated diffuse noxious inhibitory controls (DNIC), whereby a noxious conditioning stimulus inhibits the activity of spinal wide dynamic range (WDR) neurons, are abolished, and spinal 5-HT7 receptor densities are increased. Here, we manipulate spinal 5-HT content in spinal nerve ligated (SNL) animals and investigate which 5-HT receptor mediated actions predominate. METHODS: Using in vivo electrophysiology we recorded WDR neuronal responses to von frey filaments applied to the hind paw before, and concurrent to, a noxious ear pinch (the conditioning stimulus) in isoflurane-anaesthetised rats...
November 28, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27862681/differences-in-analgesic-use-in-community-dwelling-persons-with-and-without-alzheimer-s-disease
#4
A Hamina, H Taipale, A Tanskanen, A-M Tolppanen, J Tiihonen, S Hartikainen
BACKGROUND: There are conflicting findings about analgesic use among persons with cognitive impairment compared to cognitively intact older persons. The objective of our study was to investigate the prevalence of analgesic use in community-dwelling persons with and without Alzheimer's disease (AD), within six months after AD diagnosis and to find out factors associated with the use of analgesics and specific analgesic groups. METHOD: We utilized data from register based MEDALZ (Medication use and Alzheimer's disease) cohort consisting of all community-dwelling persons diagnosed with AD during 2005-2011 in Finland and their matched comparison persons without AD...
November 14, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27862644/bilateral-experimental-neck-pain-reorganize-axioscapular-muscle-coordination-and-pain-sensitivity
#5
S W Christensen, R P Hirata, T Graven-Nielsen
BACKGROUND: Neck pain is a large clinical problem where reorganized trunk and axioscapular muscle activities have been hypothesised contributing to pain persistence and pain hypersensitivity. This study investigated the effects of bilateral experimental neck pain on trunk and axioscapular muscle function and pain sensitivity. METHODS: In 25 healthy volunteers, bilateral experimental neck pain was induced in the splenius capitis muscles by hypertonic saline injections...
November 11, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27859944/user-independent-assessment-of-conditioning-pain-modulation-by-cuff-pressure-algometry
#6
T Graven-Nielsen, M Izumi, K K Petersen, L Arendt-Nielsen
BACKGROUND: The use of conditioning pain modulation (CPM) is hampered by poor reproducibility and lack of user-independent paradigms. This study refined the CPM paradigm by applying user-independent cuff algometry. METHODS: In 20 subjects, the CPM effect of conditioning with cuff stimulation on the arm was investigated by pain test stimuli on the contralateral leg before and in parallel with different cuff conditionings (10, 30, 60 kPa/60 s; 30, 60 kPa/10 s)...
November 11, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27862616/topical-gabapentin-gel-alleviates-allodynia-and-hyperalgesia-in-the-chronic-sciatic-nerve-constriction-injury-neuropathic-pain-model
#7
M Shahid, F Subhan, N Ahmad, G Ali, S Akbar, K Fawad, R D E Sewell
BACKGROUND: Systemic gabapentin is a mainstay treatment for neuropathic pain though there are side-effects. Localized therapy may curtail such side-effects so a topical gabapentin dermal application was examined in the chronic constriction injury (CCI) model of neuropathic pain. METHODS: Partial denervation CCI was achieved by rat sciatic nerve ligation. Gabapentin gel (10% w/w) was applied three times daily on the ipsilateral or contralateral plantar surface of the hind-paw, whereas in a concurrent systemic study, gabapentin was intraperitoneally administered daily (75 mg/kg) for 30 days...
November 8, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27860026/medical-specialists-care-and-hospital-costs-for-low-back-pain-in-the-netherlands
#8
C J Itz, B L T Ramaekers, M van Kleef, C D Dirksen
BACKGROUND: To examine the organization of medical specialist care and hospital costs for low back pain (LBP) in the Netherlands. METHODS: Aggregated health insurance claims data were provided on all diagnosis treatment combination (DTC) declarations for LBP patients first referred to the hospital in the 2nd half of 2008 and retrieved from Vektis, an organization that collects health insurance claims data. Data were available up to 1 January 2012. The data included patient characteristics, DTC-specific information including: neurology, neurosurgery, orthopaedic surgery, anaesthesiology and radiology...
November 8, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27807916/alpha-range-visual-and-auditory-stimulation-reduces-the-perception-of-pain
#9
K Ecsy, A K P Jones, C A Brown
BACKGROUND: Alpha power is believed to have an inverse relationship with the perception of pain. Increasing alpha power through an external stimulus may, therefore, induce an analgesic effect. Here, we attempt to modulate the perception of a moderately painful acute laser stimulus by separately entraining three frequencies across the alpha band: 8, 10 and 12 Hz. METHODS: Participants were exposed to either visual or auditory stimulation at three frequencies in the alpha-band range and a control frequency...
November 2, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27805769/basal-ganglia-dysfunction-in-complex-regional-pain-syndrome-a-valid-hypothesis
#10
REVIEW
M Azqueta-Gavaldon, H Schulte-Göcking, C Storz, S Azad, A Reiners, D Borsook, L Becerra, E Kraft
: Complex regional pain syndrome (CRPS) is a poorly understood pain disorder of the limbs. Maladaptive cortical plasticity has been shown to play a major role in its pathophysiological presentation. Recently, there is increasing interest in the role of the basal ganglia (BG), since clinical findings and neuroimaging studies point to possible BG involvement in CRPS. CRPS symptoms are often characterized by movement disorders associated with BG dysfunction. Very frequently, dystonia and tremor are reported and, to a lesser extent, myoclonus...
November 2, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27805755/vendor-derived-differences-in-injury-induced-pain-phenotype-and-pharmacology-of-sprague-dawley-rats-does-it-matter
#11
P J Kristensen, A M Heegaard, S Hestehave, R D Jeggo, O J Bjerrum, G Munro
BACKGROUND: Outbred Sprague-Dawley (SD) rats are a commonly used strain in preclinical pain research. Here, we established empirically how SD rats obtained from different vendors might vary in sensitivity to injury and pharmacotherapy. METHODS: Chronic Constriction Injury (CCI) or complete Freund's adjuvant (CFA) hindpaw inflammation was induced in male SD rats sourced from three to four different vendors, respectively. Neuropathic hypersensitivity was evaluated over 58 days using von Frey filaments, pinprick stimulation and the hot plate test...
November 2, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27774680/threat-and-fear-of-pain-induces-attentional-bias-to-pain-words-an-eye-tracking-study
#12
L Sharpe, M Brookes, E Jones, C Gittins, E Wufong, M K Nicholas
BACKGROUND: This study aimed to investigate the effects of fear of pain (FOP) and threat on attentional biases, using eye-tracking methods. METHOD: One hundred and seven undergraduate students were randomized to receive threatening or reassuring information about the cold pressor task; and divided into high and low FOP groups. Participants completed the dot-probe task, while their eye movements were tracked. RESULTS: Results showed that those who received threatening information were less likely to have their first fixation on pain words, particularly affective pain words...
October 24, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27766711/exploration-of-conditioned-pain-modulation-effect-on-long-term-potentiation-like-pain-amplification-in-humans
#13
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
https://www.readbyqxmd.com/read/27748566/mu-and-delta-opioid-receptor-knockout-mice-show-increased-colonic-sensitivity
#14
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
https://www.readbyqxmd.com/read/27748563/effects-of-subtle-cognitive-manipulations-on-placebo-analgesia-an-implicit-priming-study
#15
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
https://www.readbyqxmd.com/read/27739657/prescriptions-of-analgesics-during-complete-disease-trajectories-in-patients-who-are-diagnosed-with-and-die-from-cancer-within-the-five-year-period-2005-2009
#16
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
https://www.readbyqxmd.com/read/27739626/applying-causal-mediation-methods-to-clinical-trial-data-what-can-we-learn-about-why-our-interventions-don-t-work
#17
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
https://www.readbyqxmd.com/read/27739623/pain-expectations-in-neuropathic-pain-is-it-best-to-be-optimistic
#18
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
https://www.readbyqxmd.com/read/27739618/stimulating-trpv1-externalization-and-synthesis-in-dorsal-root-ganglion-neurons-contributes-to-pge2-potentiation-of-trpv1-activity-and-nociceptor-sensitization
#19
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
https://www.readbyqxmd.com/read/27734562/time-perspective-as-a-predictor-of-acute-postsurgical-pain-and-coping-with-pain-following-abdominal-surgery
#20
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
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