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pain threshold

Christine Petschow, Lukas Scheef, Sebastian Paus, Nadine Zimmermann, Hans H Schild, Thomas Klockgether, Henning Boecker
BACKGROUND & OBJECTIVE: Pain is a common non-motor symptom in Parkinson's disease. As dopaminergic dysfunction is suggested to affect intrinsic nociceptive processing, this study was designed to characterize laser-induced pain processing in early-stage Parkinson's disease patients in the dopaminergic OFF state, using a multimodal experimental approach at behavioral, autonomic, imaging levels. METHODS: 13 right-handed early-stage Parkinson's disease patients without cognitive or sensory impairment were investigated OFF medication, along with 13 age-matched healthy control subjects...
2016: PloS One
Baohan Pan, Kelly Byrnes, Mary Schwartz, C David Hansen, Claudia M Campbell, Malvina Krupiczojc, Michael J Caterina, Michael Polydefkis
We compared patterns of intraepidermal nerve fibers and mechanoreceptors from affected and unaffected plantar skin from patients with pachyonychia congenita (PC) and control subjects. Plantar biopsies from 10 genetically confirmed patients with PC (with a mutation in KRT6A) were performed at the ball of the foot (affected skin) and the arch (unaffected) and were compared to biopsies from corresponding locations in 10 control subjects. Tissue was processed to visualize intraepidermal nerve fibers (IENF) (PGP9...
October 20, 2016: Pain
Katherinne Ferro Moura Franco, Yuri Rafael Dos Santos Franco, Naiane Teixeira Bastos de Oliveira, Gisela Cristiane Miyamoto, Matheus Oliveira Santos, Richard Eloin Liebano, Cristina Maria Nunes Cabral
OBJECTIVE: To determine whether interferential current prior to Pilates exercises is more effective than placebo in patients with chronic non-specific low back pain. DESIGN: Two-arm randomized controlled trial, with blinded assessor, and six months follow-up. SETTING: Clinic of the School of Physical Therapy. PARTICIPANTS: The random sample consisted of 148 patients of both genders, with age between 18 and 80 and chronic non-specific low back pain...
October 19, 2016: Archives of Physical Medicine and Rehabilitation
Alexandra M Moore, Martin F Bjurstrom, Jonathan R Hiatt, Parviz K Amid, David C Chen
BACKGROUND: Refractory neuropathic inguinodynia following inguinal herniorrhaphy is a common and debilitating complication. This prospective study evaluated long-term outcomes associated with laparoscopic retroperitoneal triple neurectomy. METHODS: Sixty-two consecutive patients (51 male; mean age, 47); all failing pain management; prior reoperation in 35, prior neurectomy in 26; average follow-up 681 days (range: 90 days to 3 years). Measured outcomes include numeric pain ratings, dermatomal mapping, histologic confirmation, quantitative sensory testing, complications, narcotic usage, and activity level...
September 30, 2016: American Journal of Surgery
Shanta Islam, Md Shafiullah Shajib, Tajnin Ahmed
BACKGROUND: Celosia cristata Linn. (Amaranthaceae) is used in traditional medicine for the treatment of headache, sores, ulcers, eye inflammations, skin eruption, painful menstruation and carpal tunnel syndrome. This study was performed to evaluate the antinociceptive activity of methanol extract of the whole plant of C. cristata (MECC). METHODS: The evaluation of the antinociceptive effect of MECC was performed using thermal (hot plate, tail immersion test) and chemical (acetic acid, formalin, and glutamate-induced nociception test) pain models in mice at four different doses (50, 100, 200, 400 mg/kg; p...
October 22, 2016: BMC Complementary and Alternative Medicine
Wenjin Chen, Shengdong Guo, Shenggang Wang
BACKGROUND The purpose of our study was to determine the functional role of microRNA (miR)-16 in chronic inflammatory pain and to disclose its underlying molecular mechanism. MATERIAL AND METHODS Inflammatory pain was induced by injection of complete Freund's adjuvant (CFA) to Wistar rats. The pWPXL-miR-16, PcDNA3.1- Ras-related protein (RAB23), and/or SB203580 were delivered intrathecally to the rats. Behavioral tests were detected at 0 h, 4 h, 1 d, 4 d, 7 d, and 14 d after CFA injection. After behavioral tests, L4-L6 dorsal spinal cord were obtained and the levels of miR-16, RAB23, and phosphorylation of p38 (p-p38) were evaluated by quantitative real-time PCR (qRT-PCR)...
October 22, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
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
Shehla Akbar, Fazal Subhan, Nasiara Karim, Muhammad Shahid, Nisar Ahmad, Gowhar Ali, Wajahat Mahmood, Khwaja Fawad
BACKGROUND: Diabetic neuropathy is the most prevalent, persistent and debilitating complication of diabetes mellitus often coupled with vulvodynia that may present as an isolated symptom or as a part of constellation of other neuropathic abnormalities. OBJECTIVE: Flavonoids have selective affinity for GABA receptors and 6-methoxyflavanone (6-MeOF) is a positive allosteric modulator of GABA responses at human recombinant GABAA receptors. GABAergic and opioidergic system inhibition have been shown to facilitate neuropathic pain...
October 17, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Nathan D Crosby, John J Janik, Warren M Grill
Kilohertz-frequency spinal cord stimulation (KHF-SCS) is a potential paresthesia-free treatment for chronic pain. However, the effects of KHF-SCS on spinal dorsal column (DC) axons and its mechanisms of action remain unknown. The objectives of this study were to quantify activation and conduction block of DC axons by KHF-SCS across a range of kHz frequencies (1, 5, 10, or 20 kHz) and waveforms (biphasic pulses or sinusoids). Custom platinum electrodes delivered SCS to the T10/T11 DCs of anesthetized male Sprague-Dawley rats...
October 19, 2016: Journal of Neurophysiology
Xiao-Qian Li, Zai-Li Zhang, Wen-Fei Tan, Xi-Jia Sun, Hong Ma
Toll-like receptor 4 (TLR4) is important for the pathogenesis of inflammatory reactions and the promotion of pain processing after ischemia/reperfusion (IR) in spinal cord. Recently, C-X-C chemokine ligand 12 (CXCL12) and its receptor, C-X-C chemokine receptor 4 (CXCR4), were demonstrated to be simultaneously critical for inflammatory reactions, thereby facilitating glial activation. However, whether CXCL12/CXCR4 expression can contribute to IR-induced inflammatory pain via spinal TLR4 remained unclear. A rat model was established by 8 min of aortic arch occlusion...
2016: PloS One
Zühtü Özbek, Hasan Emre Aydin, Atacan Emre Koçman, Emre Özkara, Erdem Söztutar, Ezgi Bektur, Murat Vural, Aydan Köse, Ali Arslantaş, Cengiz Bayçu
AIM: In this study, we investigated the effects of genistein in a rat model of sciatic nerve crush injury and complete sciatic nerve transection. The effects of genistein were compared with those of gabapentin, which is widely used in clinical practice for peripheral nerve injury. MATERIAL AND METHODS: Forty-eight rats were randomly divided into six groups (n = 8 for all groups): group 1 (sham); group 2, sciatic nerve crush injury (control); group 3, sciatic nerve crush injury + genistein 20 mg/kg; group 4, sciatic nerve crush injury + gabapentin 90 mg/kg; group 5, sciatic nerve transection + genistein 20 mg/kg; group 6, sciatic nerve transection + gabapentin 90 mg/kg...
September 21, 2016: Turkish Neurosurgery
Orjan Skogar, Johan Lokk
This review focuses on the diagnosis and management of Parkinson-related pain which is one of the more frequently reported nonmotor symptoms in Parkinson's disease (PD), which is the second most common neurodegenerative disease after Alzheimer's disease. Pain is ranked high by patients as a troublesome symptom in all stages of the disease. In early-stage PD, pain is rated as the most bothersome symptom. Knowledge of the correct diagnosis of pain origin and possible methods of treatments for pain relief in PD is of great importance...
2016: Journal of Multidisciplinary Healthcare
Pranav Prasoon, Shivani Gupta, Rahul Kumar, Mayank Gautam, Saroj Kaler, Subrata Basu Ray
OBJECTIVES: Opioids such as morphine form the cornerstone in the treatment of moderate to severe pain. However, opioids also produce serious side effects such as tolerance. Fosaprepitant is a substance P (SP) receptor antagonist, which is used for treating chemotherapy-induced nausea and vomiting. SP is an important neuropeptide mediating transmission of pain at the spinal level. Thus, it was hypothesized that combining morphine with fosaprepitant would increase the antinociceptive effect of morphine...
July 2016: Indian Journal of Pharmacology
Dokyoung Sophia You, Mary W Meagher
OBJECTIVE: Childhood adversity is a vulnerability factor for chronic pain. However, the underlying pain mechanisms influenced by childhood adversity remain unknown. The aim of the current study was to evaluate the impact of childhood adversity on dynamic pain sensitivity in young adults. METHODS: After screening for childhood adverse events and health status, healthy individuals reporting low (below median; n = 75) or high levels of adversity (the top 5%; n = 51) were invited for pain testing...
October 13, 2016: Psychosomatic Medicine
Barbara D Reed, Ananda Sen, Sioban D Harlow, Hope K Haefner, Richard H Gracely
OBJECTIVE: To assess differences in vulvar and peripheral sensitivity between women with and without vulvodynia. METHODS: Women with vulvodynia (n = 41) and age-matched controls (n = 43) seen in the outpatient setting were evaluated via surveys, clinical examination, and multimodal sensory testing (pressure, heat, cold, vibration, and electrical stimulation). The relationships between sensitivity to various sensory modalities and case/control status, as well as by vulvodynia subgroups, were assessed using logistic regression...
October 7, 2016: Journal of Lower Genital Tract Disease
Sanka Amadoru, Kwang Lim, Mark Tacey, Craig Aboltins
AIMS: To explore differences in presentation and outcomes between younger and older patients with bacterial spinal infections. METHODS: Clinical, microbiological and radiological information was collected for patients at a single metropolitan hospital with spinal infections (spondylodiscitis, vertebral osteomyelitis, septic discitis, facet joint septic arthritis, and spinal epidural abscess) between January 2008 and January 2015. Patients were excluded if under 18 years of age, or if clinical and imaging findings were inconsistent with the diagnosis...
October 18, 2016: Internal Medicine Journal
M Andriamamonjy, J-B Delmotte, F Savinelli, H Beaussier, F Coudore
INTRODUCTION: Oxaliplatin is a platinum derivate widely used in cancer treatment but producing dose-limiting peripheral neurotoxicity. Acute neuropathy is characterized by a transient cold-induced distal allodynia whereas chronic neuropathy leads to sensory loss. In order to design a method for quantitative assessment of oxaliplatin-induced peripheral neuropathy, we developed a study that aims to characterize the most appropriate skin area of the hand to perform sensory tests. METHODS: We included patients treated during at least 6 months with oxaliplatin...
October 1, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
Maxime Dougados, Emily Wood, Laure Gossec, Désirée van der Heijde, Isabelle Logeart
OBJECTIVES: To assess symptomatic outcomes associated with flare after discontinuation of non-steroidal anti-inflammatory drugs (NSAIDs) in axial spondyloarthritis (axSpA). METHODS: Patients with NSAID-refractory axSpA discontinued NSAIDs, restarted if symptoms recurred, and self-recorded Bath Ankylosing Spondylitis Disease Activity Index (BASDAI). 75th percentiles were calculated for changes in BASDAI total and components from NSAID discontinuation to resumption...
September 7, 2016: Clinical and Experimental Rheumatology
Drishti Shah, Vamshi Ruthwik Anupindi, Varun Vaidya
Chronic back pain is an extremely common health problem. The largest category for pain therapy costs includes nonsteroidal anti-inflammatory drugs (NSAIDs) and opioids. However, there has been limited evidence outlining their effectiveness in terms of quality of life for the treatment of chronic back pain. The authors performed a comparative pharmacoeconomic analysis of chronic back pain patients using NSAIDs versus those using opioids alone or combination opioid analgesics. This pharmacoeconomic evaluation was conducted using the Medical Expenditure Panel Survey (MEPS)...
October 17, 2016: Journal of Pain & Palliative Care Pharmacotherapy
Vani A Mathur, Massieh Moayedi, Michael L Keaser, Shariq A Khan, Catherine S Hubbard, Madhav Goyal, David A Seminowicz
Migraine is a pain disorder associated with abnormal brain structure and function, yet the effect of migraine on acute pain processing remains unclear. It also remains unclear whether altered pain-related brain responses and related structural changes are associated with clinical migraine characteristics. Using fMRI and three levels of thermal stimuli (non-painful, mildly painful, and moderately painful), we compared whole-brain activity between 14 migraine patients and 14 matched controls. Although, there were no significant differences in pain thresholds nor in pre-scan pain ratings to mildly painful thermal stimuli, patients did have aberrant suprathreshold nociceptive processing...
2016: Frontiers in Human Neuroscience
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