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Chronic pain AND brain changes

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https://www.readbyqxmd.com/read/28801826/brain-activity-changes-in-somatosensory-and-emotion-related-areas-with-medial-patellofemoral-ligament-deficiency
#1
Masaru Kadowaki, Taku Tadenuma, Nobuyuki Kumahashi, Yuji Uchio
BACKGROUND: Patellar instability with medial patellofemoral ligament (MPFL) deficiency is a common sports injury among young people. Although nonoperative and surgical treatment can provide stability of the patella, patients often have anxiety related to the knee. We speculate that neural dysfunction may be related to anxiety in these patients; however, the mechanism in the brain that generates this anxiety remains unknown. QUESTIONS/PURPOSES: (1) How does brain activity in patients with MPFL deficiency change in the areas related to somatic sensation against lateral shift of the patella? (2) How does patella instability, which can lead to continuous fear or apprehension for dislocation, influence brain activity in the areas related to emotion? METHODS: Nineteen patients with MPFL deficiency underwent surgical reconstruction in our hospital from April 2012 to March 2014...
August 11, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28801372/multi-variant-genetic-panel-for-genetic-risk-of-opioid-addiction
#2
Keri Donaldson, Laurence Demers, Kirk Taylor, Joe Lopez, Sherman Chang
Over 116 million people worldwide have chronic pain and prescription dependence. In the US, opioids account for the majority of overdose deaths, and in 2014, almost 2 million Americans abused or were dependent on prescription opioids. Genetic factors may play a key role in opioid prescription addiction. Herein, we describe genetic variations between opioid addicted and non-addicted populations and derive a predictive model determining risk of opioid addiction. This case cohort study compares the frequency of 16 single nucleotide polymorphisms involved in the brain reward pathways in patients with and without opioid addiction...
August 2017: Annals of Clinical and Laboratory Science
https://www.readbyqxmd.com/read/28770549/therapy-related-longitudinal-brain-perfusion-changes-in-patients-with-chronic-pelvic-pain-syndrome
#3
Christian Weisstanner, Livio Mordasini, George N Thalmann, Rajeev K Verma, Christian Rummel, Andrea Federspiel, Thomas M Kessler, Roland Wiest
BACKGROUND: The imaging method most frequently employed to identify brain areas involved in neuronal processing of nociception and brain pain perception is blood oxygenation level-dependent (BOLD) magnetic resonance imaging (MRI). Arterial spin labelling (ASL), in contrast, offers advantages when slow varying changes in brain function are investigated. Chronic pelvic pain syndrome (CPPS) is a disorder of, mostly, young males that leads to altered pain perceptions in structures related to the pelvis...
August 3, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28762056/functional-brain-effects-of-hand-disuse-in-patients-with-trapeziometacarpal-joint-osteoarthritis-executed-and-imagined-movements
#4
Martina Gandola, Maurilio Bruno, Laura Zapparoli, Gianluca Saetta, Elena Rolandi, Antonio De Santis, Giuseppe Banfi, Alberto Zerbi, Valerio Sansone, Eraldo Paulesu
The human trapeziometacarpal (TMC) joint has a crucial evolutionary importance as it permits rotation and opposition of the thumb to the other fingers. In chronic TMC joint osteoarthritis (i.e., rhizarthrosis), this motor ability, essential for pinching, grasping, and manipulating objects, may become difficult or impossible due to intolerable pain. Here, we assess whether patients with rhizarthrosis show signs of abnormal brain representation of hand movements. To this end, we studied 35 patients with rhizarthrosis, affecting predominantly one of the two hands, and 35 healthy subjects who underwent both behavioural and fMRI measures of brain activity during overtly executed or imagined thumb-to-finger-opposition movements...
July 31, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28761369/capsaicin-8-patch-treatment-for-amputation-stump-and-phantom-limb-pain-a-clinical-and-functional-mri-study
#5
Rosario Privitera, Rolfe Birch, Marco Sinisi, Iordan R Mihaylov, Robert Leech, Praveen Anand
PURPOSE: The aim of this study was to measure the efficacy of a single 60 min application of capsaicin 8% patch in reducing chronic amputation stump and phantom limb pain, associated hypersensitivity with quantitative sensory testing, and changes in brain cortical maps using functional MRI (fMRI) scans. METHODS: A capsaicin 8% patch (Qutenza) treatment study was conducted on 14 patients with single limb amputation, who reported pain intensity on the Numerical Pain Rating Scale ≥4/10 for chronic stump or phantom limb pain...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28731567/integration-of-white-matter-network-is-associated-with-interindividual-differences-in-psychologically-mediated-placebo-response-in-migraine-patients
#6
Jixin Liu, Shaohui Ma, Junya Mu, Tao Chen, Qing Xu, Wanghuan Dun, Jie Tian, Ming Zhang
Individual differences of brain changes of neural communication and integration in the modular architecture of the human brain network exist for the repeated migraine attack and physical or psychological stressors. However, whether the interindividual variability in the migraine brain connectome predicts placebo response to placebo treatment is still unclear. Using DTI and graph theory approaches, we systematically investigated the topological organization of white matter networks in 71 patients with migraine without aura (MO) and 50 matched healthy controls at three levels: global network measure, nodal efficiency, and nodal intramodule/intermodule efficiency...
July 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28727713/local-brain-activity-differences-between-herpes-zoster-and-postherpetic-neuralgia-patients-a-resting-state-functional-mri-study
#7
Song Cao, Ying Li, Wenwen Deng, Bangyong Qin, Yi Zhang, Peng Xie, Jie Yuan, Buwei Yu, Tian Yu
BACKGROUND: Herpes zoster (HZ) can develop into postherpetic neuralgia (PHN), both of which are painful diseases. PHN patients suffer chronic pain and emotional disorders. Previous studies showed that the PHN brain displayed abnormal activity and structural change, but the difference in brain activity between HZ and PHN is still not known. OBJECTIVES: To identify regional brain activity changes in HZ and PHN brains with resting-state functional magnetic resonance imaging (rs-fMRI) technique, and to observe the differences between HZ and PHN patients...
July 2017: Pain Physician
https://www.readbyqxmd.com/read/28719509/the-relationship-between-structural-and-functional-brain-changes-and-altered-emotion-and-cognition-in-chronic-low-back-pain-a-systematic-review-of-mri-and-fmri-studies
#8
Sin Ki Ng, Donna M Urquhart, Paul B Fitzgerald, Flavia M Cicuttini, Sultana Monira Hussain, Bernadette M Fitzgibbon
OBJECTIVES: Chronic low back pain (CLBP) is a major health issue, yet its underlying mechanisms remain unknown. Studies have demonstrated the importance of emotion and cognition in chronic pain, however, the relevant brain physiology in magnetic resonance imaging (MRI) studies are unclear in CLBP populations. Therefore, this review aimed to identify MRI brain changes and examine their potential relationship with emotional and cognitive processes in CLBP. METHOD: A systematic search was conducted in 5 databases...
July 17, 2017: Clinical Journal of Pain
https://www.readbyqxmd.com/read/28716266/sativex%C3%A2-effects-on-promoter-methylation-and-on-cnr1-cnr2-expression-in-peripheral-blood-mononuclear-cells-of-progressive-multiple-sclerosis-patients
#9
Massimo Santoro, Massimiliano Mirabella, Chiara De Fino, Assunta Bianco, Matteo Lucchini, Francesco Losavio, Andrea Sabino, Viviana Nociti
Multiple sclerosis (MS) is a chronic demyelinating central nervous system (CNS) disease that involve oligodendrocyte loss and failure to remyelinate damaged brain areas causing a progressive neurological disability. Studies in MS mouse model suggest that cannabinoids ameliorate symptoms as spasticity, tremor and pain reducing inflammation via cannabinoid-mediated system. The aim of our study is to investigate the changes in cannabinoid type 1 (CNR1) and 2 (CNR2) receptors mRNA expression levels and promoter methylation in peripheral blood mononuclear cells (PBMCs) of MS secondary progressive (MSS-SP) patients treated with Sativex®...
August 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28708753/effectiveness-of-preoperative-intranasal-dexmedetomidine-compared-with-oral-midazolam-for-the-prevention-of-emergence-delirium-in-the-pediatric-patient-undergoing-general-anesthesia-a-systematic-review
#10
James FitzSimons, Laura S Bonanno, Stephanie Pierce, Jennifer Badeaux
BACKGROUND: Emergence delirium is defined as a cognitive disturbance during emergence from general anesthesia resulting in hallucinations, delusions and confusion manifested by agitation, restlessness, involuntary physical movement and extreme flailing in bed. Postoperative emergence delirium develops in 12% to 18% of all children undergoing general anesthesia for surgery. This post-anesthetic phenomenon changes cognitive and psychomotor behavior, and puts pediatric patients and health care personnel at risk of injury...
July 2017: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/28706741/the-link-between-depression-and-chronic-pain-neural-mechanisms-in-the-brain
#11
REVIEW
Jiyao Sheng, Shui Liu, Yicun Wang, Ranji Cui, Xuewen Zhang
Chronic pain, as a stress state, is one of the critical factors for determining depression, and their coexistence tends to further aggravate the severity of both disorders. Unfortunately, their association remains unclear, which creates a bottleneck problem for managing chronic pain-induced depression. In recent years, studies have found considerable overlaps between pain- and depression-induced neuroplasticity changes and neurobiological mechanism changes. Such overlaps are vital to facilitating the occurrence and development of chronic pain and chronic pain-induced depression...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28706449/effects-of-tianeptine-on-symptoms-of-fibromyalgia-via-bdnf-signaling-in-a-fibromyalgia-animal-model
#12
Hwayoung Lee, Jiyun Im, Hansol Won, Wooyoung Nam, Young Ock Kim, Sang Won Lee, Sanghyun Lee, Ik-Hyun Cho, Hyung-Ki Kim, Jun-Tack Kwon, Hak-Jae Kim
Previous reports have suggested that physical and psychological stresses may trigger fibromyalgia (FM). Stress is an important risk factor in the development of depression and memory impairments. Antidepressants have been used to prevent stress-induced abnormal pain sensation. Among various antidepressants, tianeptine has been reported to be able to prevent neurodegeneration due to chronic stress and reverse decreases in hippocampal volume. To assess the possible effect of tianeptine on FM symptoms, we constructed a FM animal model induced by restraint stress with intermittent cold stress...
July 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/28700539/propranolol-treatment-prevents-chronic-central-sensitization-induced-by-repeated-dural-stimulation
#13
Nelly Boyer, Jérémy Signoret-Genest, Alain Artola, Radhouane Dallel, Lénaïc Monconduit
Migraine is currently conceptualized as a chronic disease with episodic manifestations. In some patients, migraine attack frequency increases, leading to chronic migraine. Daily preventive therapy is initiated to decrease attack frequency. Propranolol, a first-line medication for migraine prophylaxis, reduces attack frequency in nearly 50% of patients receiving it. However, the mechanisms of its antimigraine action are unclear. We examined the effect of daily propranolol treatment (10 mg·kg per os, 8 days) in a rat model of recurrent activation of dural nociceptors (repeated infusion of an inflammatory soup (IS) on the dura through a cannula every 2-3 days)...
July 8, 2017: Pain
https://www.readbyqxmd.com/read/28692006/brain-signature-and-functional-impact-of-centralized-pain-a-multidisciplinary-approach-to-the-study-of-chronic-pelvic-pain-mapp-network-study
#14
Jason J Kutch, Eric Ichesco, Johnson P Hampson, Jennifer S Labus, Melissa A Farmer, Katherine T Martucci, Timothy J Ness, Georg Deutsch, A Vania Apkarian, Sean C Mackey, David J Klumpp, Anthony J Schaeffer, Larissa V Rodriguez, Karl J Kreder, Dedra Buchwald, Gerald L Andriole, H Henry Lai, Chris Mullins, John W Kusek, J Richard Landis, Emeran A Mayer, J Quentin Clemens, Daniel J Clauw, Richard E Harris
Chronic pain is often measured with a severity score that overlooks its spatial distribution across the body. This widespread pain is thought to be a marker of centralization, a central nervous system process that decouples pain perception from nociceptive input. Here, we investigated whether centralization is manifested at the level of the brain using data from 1079 participants in the Multidisciplinary Approach to the Study of Chronic Pelvic Pain Research Network (MAPP) study. Participants with a clinical diagnosis of urological chronic pelvic pain syndrome (UCPPS) were compared to pain-free controls and fibromyalgia patients, the prototypical centralized pain disorder...
June 30, 2017: Pain
https://www.readbyqxmd.com/read/28690143/the-brain-penetrant-5-ht7-receptor-agonist-lp-211-reduces-the-sensory-and-affective-components-of-neuropathic-pain
#15
Mirko Santello, Alberto Bisco, Natalie Elisabeth Nevian, Enza Lacivita, Marcello Leopoldo, Thomas Nevian
Neuropathic pain is a debilitating pathological condition of high clinical relevance. Changes in neuronal excitability in the anterior cingulate cortex (ACC) play a central role in the negative emotional and affective aspects of chronic pain. We evaluated the effects of LP-211, a new serotonin-receptor-type-7 (5-HT7R) agonist that crosses the blood-brain barrier, on ACC neurons in a mouse model of neuropathic pain. LP-211 reduced synaptic integration in layer 5 pyramidal neurons, which was enhanced in neuropathic pain due to a dysfunction of dendritic hyperpolarization-activated-and-cyclic-nucleotide-regulated (HCN) channels...
July 6, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28676749/preliminary-evidence-for-training-induced-changes-of-morphology-and-phantom-limb-pain
#16
Sandra Preißler, Désirée Thielemann, Caroline Dietrich, Gunther O Hofmann, Wolfgang H R Miltner, Thomas Weiss
The aim of this study was to investigate whether a special prosthetic training in phantom limb pain patients aimed at increasing the functional use of the prosthesis leads to neural morphological plasticity of brain structures and a reduction in phantom limb pain. For chronic pain disorders, it was shown that morphological alterations due to pain might become at least partially reversed by pain therapies. Phantom limb pain is a chronic pain disorder that is frequently followed by neural plasticity of anatomical brain structures...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28673713/alterations-in-opioid-inhibition-cause-widespread-nociception-but-do-not-affect-anxiety-like-behavior-in-oral-cancer-mice
#17
Yi Ye, Daniel G Bernabé, Elizabeth Salvo, Chi T Viet, Kentaro Ono, John C Dolan, Malvin Janal, Brad E Aouizerat, Christine Miaskowski, Brian L Schmidt
Widespread pain and anxiety are commonly reported in cancer patients. We hypothesize that cancer is accompanied by attenuation of endogenous opioid-mediated inhibition, which subsequently causes widespread pain and anxiety. To test this hypothesis we used a mouse model of oral squamous cell carcinoma (SCC) in the tongue. We found that mice with tongue SCC exhibited widespread nociceptive behaviors in addition to behaviors associated with local nociception that we reported previously. Tongue SCC mice exhibited a pattern of reduced opioid receptor expression in the spinal cord; intrathecal administration of respective mu (MOR), delta (DOR), and kappa (KOR) opioid receptor agonists reduced widespread nociception in mice, except for the fail flick assay following administration of the MOR agonist...
June 30, 2017: Neuroscience
https://www.readbyqxmd.com/read/28669596/role-of-microglia-in-mechanical-allodynia-in-the-anterior-cingulate-cortex
#18
Keisuke Miyamoto, Kazuhiko Kume, Masahiro Ohsawa
Plastic changes that increase nociceptive transmission are observed in several brain regions under conditions of chronic pain. Synaptic plasticity in the anterior cingulate cortex (ACC) is particularly associated with neuropathic pain. Glial cells are considered candidates for the modulation of neural plastic changes in the central nervous system. In this study, we aimed to investigate the role of ACC glial cells in the development of neuropathic pain. First, we examined the expression of glial cells in the ACC of nerve-ligated mice...
June 21, 2017: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/28654797/simvastatin-prevents-morphine-induced-tolerance-and-dependence-in-mice
#19
Nasim Sadat Pajohanfar, Ehsan Mohebbi, Ahmad Hosseini-Bandegharaei, Mohamadraza Amin, Golnaz Vaseghi, Bahareh Amin
BACKGROUND: Tolerance to analgesic effects of opioids and dependence to them are main concerns in the treatment of chronic pain conditions, limiting clinical application of these drugs. This study aimed to evaluate the effect of simvastatin on the morphine-induced tolerance and dependence in mice. MATERIAL AND METHODS: For this purpose, mice were treated with either daily morphine (20 mg/kg, s.c.) alone, or in combination with simvastatin (2.5, 5 and 10mg/kg, i...
September 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28648456/brain-derived-neurotrophic-factor-in-the-infralimbic-cortex-alleviates-inflammatory-pain
#20
Lupeng Yue, Long-Yu Ma, Shuang Cui, Feng-Yu Liu, Ming Yi, You Wan
In chronic pain, it has been reported that the medial prefrontal cortex (mPFC) takes important regulatory roles, and may change functionally and morphologically in result of chronic pain. Brain-derived neurotrophic factor (BDNF) is well known as a critical modulator of neuronal excitability and synaptic transmission in the central nervous system. The aim of the present study is to investigate the role of BDNF in the infralimbic cortex and the prelimbic cortex of the mPFC in complete Freund's adjuvant (CFA)-induced inflammatory pain...
August 10, 2017: Neuroscience Letters
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