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Quantitative sensory testing

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https://www.readbyqxmd.com/read/29781961/-from-ear-to-trunk-mri-reveals-referral-of-pain
#1
Julia Forstenpointner, Stephan Wolff, Patrick W Stroman, Olav Jansen, Stefanie Rehm, Ralf Baron, Janne Gierthmühlen
Referred and projecting pain can be observed in acute and chronic pain states. We present the case of a 69-year-old female patient with postherpetic neuralgia (PHN) in dermatome Th2/3 who reported that touching the ipsilateral earlap (dermatome C2) would enhance pain and dynamic mechanical allodynia (DMA) in the affected Th2/3-dermatome. The aim was to investigate possible underlying mechanisms of this phenomenon using the capsaicin experimental pain sensitization model, quantitative sensory testing (QST) and functional spinal and supraspinal MRI (fMRI)...
May 16, 2018: Pain
https://www.readbyqxmd.com/read/29781957/quantitative-sensory-testing-in-patients-with-migraine-a-systemic-review-and-meta-analysis
#2
Hadas Nahman-Averbuch, Tom Shefi, Victor J Schneider, Dan Li, Lili Ding, Christopher D King, Robert C Coghill
Quantitative sensory testing (QST) is widely used to assess somatosensory function by application of controlled stimuli across a variety of modalities. The aim of the present meta-analysis is to synthesize QST results across a wide array of studies of patients with migraine to identify the QST parameters that are reliably different between patients with migraine and healthy controls. In addition, we aimed to determine whether such differences vary according to stimulus location. A comprehensive literature search (up to January 2017) was conducted, which included studies comparing QST parameters between patients with migraine and healthy controls...
May 17, 2018: Pain
https://www.readbyqxmd.com/read/29777310/mechanical-sensitivity-and-psychological-factors-in-patients-with-burning-mouth-syndrome
#3
Mika Honda, Takashi Iida, Hirona Kamiyama, Manabu Masuda, Misao Kawara, Peter Svensson, Osamu Komiyama
OBJECTIVES: The aim of this study was to compare mechanical sensitivity on the tongue using quantitative sensory testing (QST) and psychological factors using the General Health Questionnaire (GHQ) between burning mouth syndrome (BMS) patients and healthy participants. MATERIALS AND METHODS: Participants comprised 20 female BMS patients (68.1 ± 7.4 years) and 20 healthy females (65.4 ± 4.6 years). Psychological factors were evaluated with GHQ. Tactile detection thresholds (TDT) and filament-prick pain detection thresholds (FPT) were used to evaluate mechanical sensitivity on the tongue in all participants...
May 18, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29767649/experimental-psychological-stress-on-quantitative-sensory-testing-response-in-patients-with-temporomandibular-disorders
#4
Dyna Mara Araújo Oliveira Ferreira, Yuri Martins Costa, Henrique Müller de Quevedo, Leonardo Rigoldi Bonjardim, Paulo César Rodrigues Conti
AIMS: To assess the modulatory effects of experimental psychological stress on the somatosensory evaluation of myofascial temporomandibular disorder (TMD) patients. METHODS: A total of 20 women with myofascial TMD and 20 age-matched healthy women were assessed by means of a standardized battery of quantitative sensory testing. Cold detection threshold (CDT), warm detection threshold (WDT), cold pain threshold (CPT), heat pain threshold (HPT), mechanical pain threshold (MPT), wind-up ratio (WUR), and pressure pain threshold (PPT) were performed on the facial skin overlying the masseter muscle...
May 15, 2018: Journal of Oral & Facial Pain and Headache
https://www.readbyqxmd.com/read/29760401/belief-state-representation-in-the-dopamine-system
#5
Benedicte M Babayan, Naoshige Uchida, Samuel J Gershman
Learning to predict future outcomes is critical for driving appropriate behaviors. Reinforcement learning (RL) models have successfully accounted for such learning, relying on reward prediction errors (RPEs) signaled by midbrain dopamine neurons. It has been proposed that when sensory data provide only ambiguous information about which state an animal is in, it can predict reward based on a set of probabilities assigned to hypothetical states (called the belief state). Here we examine how dopamine RPEs and subsequent learning are regulated under state uncertainty...
May 14, 2018: Nature Communications
https://www.readbyqxmd.com/read/29756090/capsaicin-8-patch-reversibly-reduces-a-delta-fiber-evoked-potential-amplitudes
#6
Aikaterini Papagianni, Gabriela Siedler, Claudia Sommer, Nurcan Üçeyler
Introduction: The capsaicin 8% patch is a treatment option in patients with localized peripheral neuropathic pain. Better understanding of its mechanisms of action and knowledge on predictive biomarkers for a treatment response is warranted. Objectives: To use electrically evoked pain-related potentials for investigation of A-delta fiber conduction after capsaicin 8% patch treatment. Methods: We studied 11 healthy controls at the dorsal hand and the foot and 12 patients with neuropathic pain at the area affected by neuropathic pain before and 2 hours after application of a capsaicin 8% patch (Qutenza)...
March 2018: Pain Reports (Baltimore, Md.)
https://www.readbyqxmd.com/read/29756087/from-acute-to-persistent-low-back-pain-a-longitudinal-investigation-of-somatosensory-changes-using-quantitative-sensory-testing-an-exploratory-study
#7
Anna Marcuzzi, Paul J Wrigley, Catherine M Dean, Petra L Graham, Julia M Hush
Introduction: Chronic low back pain (LBP) is commonly associated with generalised pain hypersensitivity. It is suggested that such somatosensory alterations are important determinants for the transition to persistent pain from an acute episode of LBP. Although cross-sectional research investigating somatosensory function in the acute stage is developing, no longitudinal studies designed to evaluate temporal changes have been published. Objectives: This exploratory study aimed to investigate the temporal development of somatosensory changes from the acute stage of LBP to up to 4 months from onset...
March 2018: Pain Reports (Baltimore, Md.)
https://www.readbyqxmd.com/read/29753471/effects-of-processing-conditions-on-the-texture-and-rheological-properties-of-model-acid-gels-and-cream-cheese
#8
M Brighenti, S Govindasamy-Lucey, J J Jaeggi, M E Johnson, J A Lucey
Manufacture of cream cheese involves the formation of an initial acid-induced gel made from high-fat milk, followed by a series of processing steps including shearing, heating, and dewatering that complete the conversion of the acid gel into a complex cheese product. We investigated 2 critical parameters for their effect on the initial gel: homogenization pressure (HP) of the high-fat cheese milk, and fermentation temperature (FT). The impact of a low (10 MPa) and high (25 MPa) HP, and low (20°C) and high (26°C) FT were investigated for their effects on rheological and textural properties of acid-induced gels...
May 9, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29751194/the-central-sensitization-inventory-and-pain-sensitivity-questionnaire-an-exploration-of-construct-validity-and-associations-with-widespread-pain-sensitivity-among-individuals-with-shoulder-pain
#9
Rogelio A Coronado, Steven Z George
BACKGROUND: The Central Sensitization Inventory (CSI) and Pain Sensitivity Questionnaire (PSQ) are alternatives to quantitative sensory testing (QST) for inferring central sensitization. OBJECTIVE: Explore 1) comparative validity of the CSI and PSQ with QST (construct validity) and pain-related psychological questionnaires (concurrent validity), and 2) associations with widespread pain sensitivity. METHODS: Seventy-eight participants with unilateral shoulder pain less than 6 months (mean ± SD age = 39...
May 3, 2018: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/29746857/women-undergoing-third-line-overactive-bladder-treatment-demonstrate-elevated-thermal-temporal-summation
#10
W Stuart Reynolds, Casey Kowalik, Joshua Cohn, Melissa Kaufman, Alan Wein, Roger Dmochowski, Stephen Bruehl
PURPOSE: To determine if women with overactive bladder (OAB) requiring 3rd line therapy demonstrate greater central sensitization, indexed by temporal summation to heat pain stimuli, than those with OAB. MATERIALS AND METHODS: We recruited 39 adult women with OAB from the Urology clinic who were planning to undergo interventional therapy for medication refractory OAB with either onabotulinumtoxinA bladder injection or sacral neuromodulation and 55 women with OAB, either newly seen in our Urology clinic or responding to advertisements for study participation...
May 7, 2018: Journal of Urology
https://www.readbyqxmd.com/read/29742109/effect-of-single-dose-imipramine-on-chronic-low-back-and-experimental-pain-a-randomized-controlled-trial
#11
Jürg Schliessbach, Andreas Siegenthaler, Lukas Bütikofer, Andreas Limacher, Peter Juni, Pascal H Vuilleumier, Ulrike Stamer, Lars Arendt-Nielsen, Michele Curatolo
Antidepressants are frequently prescribed as co-analgesics in chronic pain. While their efficacy is well documented for neuropathic pain, the evidence is less clear in musculoskeletal pain conditions. The present study therefore evaluated the effect of the tricyclic antidepressant imipramine on chronic low-back pain in a randomized, double-blinded placebo-controlled design. To explore the mechanisms of action and the influence of drug metabolism, multimodal quantitative sensory tests (QST) and genotyping for cytochrome P450 2D6 (CYP2D6) were additionally performed...
2018: PloS One
https://www.readbyqxmd.com/read/29736857/neuropathic-pain-after-spinal-cord-injury-challenges-and-research-perspectives
#12
REVIEW
Rani Shiao, Corinne A Lee-Kubli
Neuropathic pain is a debilitating consequence of spinal cord injury (SCI) that remains difficult to treat because underlying mechanisms are not yet fully understood. In part, this is due to limitations of evaluating neuropathic pain in animal models in general, and SCI rodents in particular. Though pain in patients is primarily spontaneous, with relatively few patients experiencing evoked pains, animal models of SCI pain have primarily relied upon evoked withdrawals. Greater use of operant tasks for evaluation of the affective dimension of pain in rodents is needed, but these tests have their own limitations such that additional studies of the relationship between evoked withdrawals and operant outcomes are recommended...
May 7, 2018: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/29729778/cancer-related-neuropathic-pain-review-and-selective-topics
#13
REVIEW
Mellar P Davis
Neuropathic pain is the result of neuroplastic and neuroinflammatory changes from trauma or diseases that damage the somatosensory system. Cancer-related neuropathic pain is caused by treatment, cancer, or paraneoplastic reactions to cancer. Approximately 30% of patients with cancer have neuropathic pain, mostly mixed nociceptive and neuropathic pain. History, physical examination, quantitative sensory testing, skin punch biopsies, and functional MRIs help to divide pain into phenotypes that may facilitate analgesic choices...
June 2018: Hematology/oncology Clinics of North America
https://www.readbyqxmd.com/read/29725795/a-low-dose-of-three-local-anesthetic-solutions-for-interscalene-blockade-tested-by-thermal-quantitative-sensory-testing-a-randomized-controlled-trial
#14
Luc A Sermeus, Tom Schepens, Guy H Hans, Stuart G Morrison, Kristien Wouters, Margaretha B Breebaart, Carine J Smitz, Marcel P Vercauteren
This randomized double-blind controlled trial compared the block characteristics of three low-dose local anesthetics at different roots in an ultrasound-guided interscalene block, using thermal quantitative sensory testing for assessing the functioning of cutaneous small nerve fibres. A total of 37 adults scheduled to undergo shoulder arthroscopy were randomized to receive 5 mL of either 0.5% levobupivacaine with and without epinephrine 1/200,000 or 0.75% ropivacaine in a single-shot interscalene block. Thermal quantitative sensory testing was performed in the C4, C5, C6 and C7 dermatomes...
May 3, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29719781/a-novel-quantified-bitterness-evaluation-model-for-traditional-chinese-herbs-based-on-an-animal-ethology-principle
#15
Xue Han, Hong Jiang, Li Han, Xi Xiong, Yanan He, Chaomei Fu, Runchun Xu, Dingkun Zhang, Junzhi Lin, Ming Yang
Traditional Chinese herbs (TCH) are currently gaining attention in disease prevention and health care plans. However, their general bitter taste hinders their use. Despite the development of a variety of taste evaluation methods, it is still a major challenge to establish a quantitative detection technique that is objective, authentic and sensitive. Based on the two-bottle preference test (TBP), we proposed a novel quantitative strategy using a standardized animal test and a unified quantitative benchmark. To reduce the difference of results, the methodology of TBP was optimized...
March 2018: Acta Pharmaceutica Sinica. B
https://www.readbyqxmd.com/read/29717288/effects-of-adding-intrathecal-dexmedetomidine-to-hyperbaric-bupivacaine-for-saddle-spinal-block-in-adults-undergoing-peri-anal-surgeries
#16
Binod Gautam, Sushila Moktan Lama, Mona Sharma
BACKGROUND: Saddle spinal block is the first choice anesthetic technique for adults undergoing peri-anal surgeries. It prevents unnecessary high levels of analgesia and sympathetic block. However, it may not provide prolonged analgesia. This study aims to investigate analgesic effects of dexmedetomidine when added to hyperbaric bupivacaine in saddle spinal block. METHODS: Fifty otherwise healthy adults scheduled for uncomplicated peri-anal surgery were randomly allocated into two equal groups in this double-blinded study...
March 13, 2018: Journal of Nepal Health Research Council
https://www.readbyqxmd.com/read/29713457/the-regional-effect-of-spinal-manipulation-on-the-pressure-pain-threshold-in-asymptomatic-subjects-a-systematic-literature-review
#17
REVIEW
Margaux Honoré, Charlotte Leboeuf-Yde, Olivier Gagey
Background: Spinal manipulation (SM) has been shown to have an effect on pain perception. More knowledge is needed on this phenomenon and it would be relevant to study its effect in asymptomatic subjects. Objectives: To compare regional effect of SM on pressure pain threshold (PPT) vs. sham, inactive control, mobilisation, another SM, and some type of physical therapy. In addition, we reported the results for the three different spinal regions. Method: A systematic search of literature was done using PubMed, Embase and Cochrane...
2018: Chiropractic & Manual Therapies
https://www.readbyqxmd.com/read/29708361/the-effect-of-clustering-on-perceived-quantity-in-humans-homo-sapiens-and-in-chicks-gallus-gallus
#18
Marco Bertamini, Martin Guest, Giorgio Vallortigara, Rosa Rugani, Lucia Regolin
Animals can perceive the numerosity of sets of visual elements. Qualitative and quantitative similarities in different species suggest the existence of a shared system (approximate number system). Biases associated with sensory properties are informative about the underlying mechanisms. In humans, regular spacing increases perceived numerosity (regular-random numerosity illusion). This has led to a model that predicts numerosity based on occupancy (a measure that decreases when elements are close together)...
April 30, 2018: Journal of Comparative Psychology
https://www.readbyqxmd.com/read/29706009/relations-between-a-standardized-experimental-stressor-and-cutaneous-sensory-function-in-patients-with-chronic-pruritus-and-healthy-controls
#19
G Schneider, A Stumpf, M Burgmer, L Volmering, P Broecker, S Ständer
BACKGROUND: While chronic pruritus (CP) is a frequent symptom, many aspects of its underlying pathophysiological mechanisms still need elucidation. Research on sensory cutaneous function and on the influence of stress has been conducted mainly in patients with atopic dermatitis but is lacking for patients with CP. OBJECTIVE: To assess whether a standardized social stressor influences cutaneous sensory function in patients with CP in comparison to healthy controls (HC) METHODS: Case-control study; 33 CP and 30 HC were submitted to the standardized Quantitative Sensory Testing protocol before and after the Trier Social Stress Test and one hour later...
April 28, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29705914/a-longitudinal-study-of-painless-and-painful-intercostobrachial-neuropathy-after-breast-cancer-surgery
#20
S La Cesa, P Sammartino, C Mollica, G Cascialli, G Cruccu, A Truini, M Framarino-Dei-Malatesta
Intercostobrachial neuropathy, often resulting in neuropathic pain, is a common complication of breast cancer surgery. In this 1-year longitudinal study, we aimed at seeking information on the frequency, clinical features, and course of painless and painful intercostobrachial neuropathy. We enrolled 40 women previously undergoing breast cancer surgery. In these patients, we collected, at 3, 6 and 12 months after surgery, clinical and quantitative sensory testing (QST) variables to diagnose intercostobrachial neuropathy, DN4 questionnaire to identify neuropathic pain, Neuropathic Pain Symptom Inventory to assess the different neuropathic pain symptoms, the Beck Depression Inventory to assess depressive symptoms, and SF36 to assess quality of life and Patient Global Impression of Change...
April 29, 2018: Neurological Sciences
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