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pain threshold

Neil E O'Connell, Louise Marston, Sally Spencer, Lorraine H DeSouza, Benedict M Wand
BACKGROUND: This is an updated version of the original Cochrane Review published in 2010, Issue 9, and last updated in 2014, Issue 4. Non-invasive brain stimulation techniques aim to induce an electrical stimulation of the brain in an attempt to reduce chronic pain by directly altering brain activity. They include repetitive transcranial magnetic stimulation (rTMS), cranial electrotherapy stimulation (CES), transcranial direct current stimulation (tDCS), transcranial random noise stimulation (tRNS) and reduced impedance non-invasive cortical electrostimulation (RINCE)...
March 16, 2018: Cochrane Database of Systematic Reviews
Rocío Melero-Suárez, José Antonio Sánchez-Santos, Gabriel Domínguez-Maldonado
BACKGROUND: Closely related pathologic disorders sometimes manifest with the same symptoms, making for a complex differential diagnosis. This is the situation in plantar fasciitis (PF) and myofascial pain syndrome (MPS) with myofascial trigger points (MTPs) in the sole of the foot. This research assessed the analgesic effect on plantar pain of combination therapy with interferential current stimulation therapy (ICST), treating MTPs in the great toe adductor muscle and the short flexor muscles of the toes in patients whose diagnosis was compatible with PF or MPS...
January 2018: Journal of the American Podiatric Medical Association
Ruchita Dixit, Sowmya Nettem, Simerjit S Madan, Htoo Htoo Kyaw Soe, Adinegara Bl Abas, Leah D Vance, Patrick J Stover
BACKGROUND: Sickle cell disease (SCD) is a group of disorders that affects haemoglobin, which causes distorted sickle- or crescent-shaped red blood cells. It is characterized by anaemia, increased susceptibility to infections and episodes of pain. The disease is acquired by inheriting abnormal genes from both parents, the combination giving rise to different forms of the disease. Due to increased erythropoiesis in people with SCD, it is hypothesized that they are at an increased risk for folate deficiency...
March 16, 2018: Cochrane Database of Systematic Reviews
Monika Löfgren, Christina H Opava, Ingrid Demmelmaier, Cecilia Fridén, Ingrid E Lundberg, Birgitta Nordgren, Eva Kosek
BACKGROUND: We aimed to explore pressure pain sensitivity and the function of segmental and plurisegmental exercise-induced hypoalgesia (EIH) in persons with rheumatoid arthritis (RA) compared with healthy control subjects (HC). METHODS: Forty-six participants with RA (43 female, 3 male) and 20 HC (16 female, 4 male) participated in the study. Pressure pain thresholds, suprathreshold pressure pain at rest, and segmental and plurisegmental EIH during standardised submaximal contractions were assessed by algometry...
March 15, 2018: Arthritis Research & Therapy
Jenny L Davies, JaNean K Engelstad, Linde E Gove, Linda K Linbo, Rickey E Carter, Christopher Lynch, Nathan P Staff, Christopher J Klein, P James B Dyck, David N Herrmann, Peter J Dyck
INTRODUCTION: For sequential and somatotopic assessment of small fiber neuropathy (SFN), heat pain (HP) tests of hypoalgesia might be used instead of decreased counts of epidermal nerve fibers (ENFs), but then healthy subject reference values of HP thresholds are needed. METHODS: Using the CASE IVc system, HP thresholds of hypoalgesia were estimated for ten unilateral sites and counts of ENFs for four of them in healthy subjects. RESULTS: In healthy subjects, small but statistically significant differences of both HP thresholds of hypoalgesia and counts of ENFs were observed among tested sites...
March 15, 2018: Muscle & Nerve
Young Hak Roh, Young Do Koh, Jong Oh Kim, Kyu Ho Lee, Hyun Sik Gong, Goo Hyun Baek
BACKGROUND: Postoperative pillar pain (deep-seated wrist pain worsened by leaning on the heel of the hand) sometimes occurs after carpal tunnel release (CTR), leading to weakness in the hand and delayed return to work. Increased pain sensitivity has been found to be associated with worse symptoms and poorer treatment response in a number of chronic musculoskeletal conditions, but few studies have investigated the association of pain sensitization with pillar pain after CTR. QUESTIONS/PURPOSES: (1) Is preoperative pain sensitization in patients with carpal tunnel syndrome (CTS) associated with increased severity of pillar pain after open CTR? (2) What other demographic, electrophysiological, or preoperative clinical characteristics are associated with pillar pain after CTR? METHODS: Over a 35-month period, one surgeon performed 162 open carpal tunnel releases...
April 2018: Clinical Orthopaedics and related Research
B M Fitzgibbon, K E Hoy, L A Knox, E K Guymer, G Littlejohn, D Elliot, L E Wambeek, S McQueen, K A Elford, S J Lee, P G Enticott, P B Fitzgerald
BACKGROUND: Fibromyalgia is a complex chronic disorder with few effective treatments currently available. One promising treatment option is repetitive Transcranial Magnetic Stimulation (rTMS), a non-invasive brain stimulation technique that has shown promise in disorders effecting the central nervous system. METHODS: We assessed the efficacy of a course of high-frequency (10Hz) left-hemisphere dorsolateral prefrontal cortex (DLPFC) rTMS in 26 patients (14 active; 12 sham) with a diagnosis of fibromyalgia...
March 15, 2018: European Journal of Pain: EJP
Dorota Nieoczym, Katarzyna Socała, Piotr Wlaź
Ursolic acid (UA) is a plant derived compound which is also a component of the standard human diet. It possesses a wide range of pharmacological properties, i.e., antioxidant, anti-inflammatory, antimicrobial and antitumor, which have been used in folk medicine for centuries. Moreover, influence of UA on central nervous system-related processes, i.e., pain, anxiety and depression, was proved in experimental studies. UA also revealed anticonvulsant properties in animal models of epilepsy and seizures. The aim of the present study was to investigate the influence of UA on seizure thresholds in three acute seizure models in mice, i...
March 14, 2018: Neurochemical Research
Thomas Krøigård, Martin Wirenfeldt, Toke K Svendsen, Søren H Sindrup
Background: Cold-induced peripheral neuropathy has been described in individuals exposed to severe cold resulting in pain, hypersensitivity to cold, hyperhidrosis, numbness, and skin changes. Nerve conduction studies and thermal detection thresholds are abnormal in symptomatic patients, and intraepidermal nerve fiber density (IENFD) in skin biopsies is reduced. Case presentation: A 41-year-old male was included as a healthy subject in a study of the spontaneous variability of quantitative sensory testing (QST), nerve conduction studies (NCS), and IENFD...
March 2018: Brain and Behavior
Zachary Curry, Jenny Wilkerson, Deniz Bagdas, Sarah Kyte, Nipa Patel, Giulia Donvito, Mohammed A Mustafa, Justin Poklis, Micah Niphakis, Ku-Lung Hsu, Benjamin F Cravatt, David A Gewirtz, M Imad Damaj, Aron H Lichtman
Although paclitaxel effectively treats various cancers, its debilitating peripheral neuropathic pain side effects often persist long after treatment has ended. Therefore, a compelling need exists for the identification of novel pharmacologic strategies to mitigate this condition. As inhibitors of monoacylglycerol lipase (MAGL), the primary hydrolytic enzyme of the endogenous cannabinoid 2-arachidonyolglycerol, produce antinociceptive effects in numerous rodent models of pain, we investigated whether inhibitors of this enzyme (i...
March 14, 2018: Journal of Pharmacology and Experimental Therapeutics
Charline Kambrun, Olivier Roca-Lapirot, Chiara Salio, Marc Landry, Aziz Moqrich, Yves Le Feuvre
C-low-threshold mechanoreceptors (C-LTMRs) are sensory neurons that, beyond conveying pleasant touch, modulate nociceptive transmission within the spinal cord. However, pain alleviation by C-LTMRs remains poorly understood. Here, we show that the C-LTMR-derived TAFA4 chemokine induces a reinforcement of inhibitory synaptic transmission within spinal networks, which consequently depresses local excitatory synapses and impairs synaptic transmission from high-threshold C-fibers. In animals with inflammation induced by Freund's complete adjuvant, TAFA4 decreases the noxious stimulus-induced neuronal responses recorded in vivo and alleviates mechanical pain...
March 13, 2018: Cell Reports
István Z Bátai, Ádám Horváth, Erika Pintér, Zsuzsanna Helyes, Gábor Pozsgai
Transient receptor potential ankyrin 1 (TRPA1) non-selective ligand-gated cation channels are mostly expressed in primary sensory neurons. Polysulfides (POLYs) are Janus-faced substances interacting with numerous target proteins and associated with both protective and detrimental processes. Activation of TRPA1 in sensory neurons, consequent somatostatin (SOM) liberation and action on sst4 receptors have recently emerged as mediators of the antinociceptive effect of organic trisulfide dimethyl trisulfide (DMTS)...
2018: Frontiers in Endocrinology
Inès Daguet, Kayla Bergeron-Vézina, Marie-Philippe Harvey, Marylie Martel, Guillaume Léonard
Purpose: Placebo analgesia refers to a perceived reduction in pain intensity following the administration of a simulated or otherwise medically ineffective treatment. Previous studies have shown that many factors can influence the magnitude of placebo analgesia. However, few investigations have examined the effect of age on placebo analgesia, and none have done it in the context of electrotherapeutic interventions. The objective of this study is to compare the placebo response induced by sham transcutaneous electrical nerve stimulation (TENS) between young and older individuals, using an experimental heat-pain paradigm...
2018: Clinical Interventions in Aging
Monica Teng, Hui Jun Zhou, Liang Lin, Pang Hung Lim, Doreen Yeo, Suzanne Goh, Soon Yin Tjan, Boon Peng Lim
Background: The study evaluated the cost-effectiveness of hydrotherapy versus land-based therapy in patients with musculoskeletal disorders (MSDs) in Singapore. Methods: A decision-analytic model was constructed to compare the cost-effectiveness of hydrotherapy to land-based therapy over 3 months from societal perspective. Target population comprised patients with low back pain (LBP), osteoarthritis (OA), rheumatoid arthritis (RA), total hip replacement (THR) and total knee replacement (TKR)...
March 9, 2018: Journal of Public Health
Alberto J Espay, Richard Trosch, Gustavo Suarez, Jonathan Johnson, Dominic Marchese, Cynthia Comella
OBJECTIVES: To characterize the minimal clinically important change (MCIC) after treatment in cervical dystonia patients using the Toronto Western Spasmodic Torticollis Rating Scale (TWSTRS). METHODS: Changes in the TWSTRS from an observational study of abobotulinumtoxinA in the routine management of cervical dystonia (NCT01314365) were analyzed using the Patient Global Impression of Change (PGIC) as anchor. RESULTS: For the overall population (N = 304, baseline TWSTRS-Total score 43...
March 7, 2018: Parkinsonism & related Disorders
Nikola Vučinić, Mirela Erić, Snežana Tomašević-Todorovič, Bojana Milekić
BACKGROUND: Algometry, as a highly sensitive method, provides an objective insight into the degree of pain, while the use of questionnaires can estimate the patient's psychological status in a simple way. OBJECTIVE: This study was conducted in order to measure the pressure pain threshold in patients with cervical and lumbar radiculopathy and to find a possible association of pain with the anxiety and depression. METHODS: The study examined 60 hospitalized patients with cervical radiculopathy and 60 patients with lumbar radiculopathy before starting and after finishing kinesitherapy...
March 2, 2018: Journal of Back and Musculoskeletal Rehabilitation
Anna Lubkowska, Aleksandra Radecka, Iwona Bryczkowska, Iwona Rotter, Maria Laszczyńska, Beata Karakiewicz
BACKGROUND: The therapeutic effects of visible light and infrared is especially often used in physiotherapy. OBJECTIVE: The purpose of this study was to determine the effect of exposure to radiation on the motor units activity. METHODS: The study included 29 volunteers whom was evaluated the spontaneous and voluntary bioelectric activity of the trapezius muscle using surface electromyography (value of average amplitude and frequency), before and immediately after a 15-minute irradiation...
March 2, 2018: Journal of Back and Musculoskeletal Rehabilitation
Brigitte Tampin, Jan Vollert, Annina B Schmid
OBJECTIVE: Distal and proximal entrapment neuropathies such as carpal tunnel syndrome (CTS) and cervical radiculopathy (CR) share similar etiologies. Experimental models suggest that despite comparable etiology, pathomechanisms associated with injuries of the peripheral and central axon branches are distinct. This study therefore compared self-reported and elicited sensory profiles in patients with distal and proximal entrapment neuropathies. METHODS: Patients with electrodiagnostically confirmed CTS (n = 103) and patients with CR (n = 23) were included in this study...
March 10, 2018: Current Medical Research and Opinion
Meritxell Llorca-Torralba, Juan A Mico, Esther Berrocoso
The persistent activation of N-methyl-d-aspartate acid receptors (NMDARs) seems to be responsible for a series of changes in neurons associated with neuropathic pain, including the failure of opioids that act through mu-opioid receptors (MORs) to provide efficacious pain relief. As the noradrenergic locus coeruleus (LC) forms part of the endogenous analgesic system, we explored how intra-LC administration of morphine, a MORs agonist, alone or in combination with MK-801, a NMDARs antagonist, affects the sensorial and affective dimension of pain in a rat model of neuropathic pain; chronic constriction injury (CCI)...
March 7, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
Anna Julia Karmann, Christoph Lauer, Elisabeth Ziegler, Lena Killian, Claudia Horn-Hofmann, Stefan Lautenbacher
Strong alterations of night sleep (e.g., sleep deprivation, insomnia) have appeared to affect pain in inducing hyperalgesic changes. However, it has remained unclear whether everyday variations of night sleep in healthy individuals have any influence on pain processing. Forty healthy subjects were studied by portable polysomnography (PSG) and sleep questionnaire during two non-consecutive nights at home. Experimental pain parameters (pressure pain threshold, temporal summation = TS, conditioned pain modulation = CPM) and situational pain catastrophizing (Situational Catastrophizing Questionnaire = SCQ) were always assessed the evening before and the morning after sleep recording in a pain laboratory...
March 6, 2018: Biological Psychology
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