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Small fiber neuropathy

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https://www.readbyqxmd.com/read/29135602/ocular-surface-alterations-in-the-context-of-corneal-in-vivo-confocal-microscopic-characteristics-in-patients-with-fibromyalgia
#1
Kadriye Erkan Turan, Sibel Kocabeyoglu, Isin Unal-Cevik, Figen Bezci, Aysen Akinci, Murat Irkec
PURPOSE: To quantify the morphology of corneal basal epithelium and subbasal nerves and to evaluate the ocular surface alterations in patients with fibromyalgia (FM). METHODS: Patients with FM (n = 34) and healthy controls (n = 42) were enrolled. All participants underwent ocular surface tests in the following order: corneal sensitivity, tear film breakup time, lissamine green staining, Schirmer test, and the Ocular Surface Disease Index questionnaire. Basal epithelial cells and subbasal nerves were evaluated using in vivo confocal microscopy (IVCM)...
November 9, 2017: Cornea
https://www.readbyqxmd.com/read/29114916/hierarchical-models-for-epidermal-nerve-fiber-data
#2
Claes Andersson, Tuomas Rajala, Aila Särkkä
While epidermal nerve fiber (ENF) data have been used to study the effects of small fiber neuropathies through the density and the spatial patterns of the ENFs, little research has been focused on the effects on the individual nerve fibers. Studying the individual nerve fibers might give a better understanding of the effects of the neuropathy on the growth process of the individual ENFs. In this study, data from 32 healthy volunteers and 20 diabetic subjects, obtained from suction induced skin blister biopsies, are analyzed by comparing statistics for the nerve fibers as a whole and for the segments that a nerve fiber is composed of...
November 7, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/29112785/associated-conditions-in-small-fiber-neuropathy-a-large-cohort-study-and-review-of-the-literature
#3
Bianca T A de Greef, Janneke G J Hoeijmakers, Carla M L Gorissen-Brouwers, Margot Geerts, Catharina G Faber, Ingemar S J Merkies
BACKGROUND: Small fiber neuropathy (SFN) is a common disorder, leading to neuropathic pain and autonomic symptoms. The objective of this study was to investigate associated conditions in a large cohort of SFN patients and compare the prevalence to healthy individuals. METHODS: A total of 921 patients with pure SFN were screened according to a standardized comprehensive diagnostic algorithm and compared with literature findings. RESULTS: In 53% of the patients, no associated condition could be found...
November 7, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29106982/distinct-trka-and-ret-modulated-negative-and-positive-neuropathic-behaviors-in-a-mouse-model-of-resiniferatoxin-induced-small-fiber-neuropathy
#4
Yu-Lin Hsieh, Hung-Wei Kan, Hao Chiang, Yi-Chen Lee, Sung-Tsang Hsieh
Neurotrophic factors and their corresponding receptors play key roles in the maintenance of different phenotypic dorsal root ganglion (DRG) neurons, the axons of which degenerate in small fiber neuropathy, leading to various neuropathic manifestations. Mechanisms underlying positive and negative symptoms of small fiber neuropathy have not been systematically explored. This study investigated the molecular basis of these seemingly paradoxical neuropathic behaviors according to the profiles of TrkA and Ret with immunohistochemical and pharmacological interventions in a mouse model of resiniferatoxin (RTX)-induced small fiber neuropathy...
October 26, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/29077516/sfn-siq-sfnsl-and-skin-biopsy-of-55-cases-with-small-fiber-involvement
#5
Bo Sun, Yifan Li, Lizhi Liu, Zhaohui Chen, Li Ling, Fei Yang, Jiexiao Liu, Hong Liu, Xusheng Huang
INTRODUCTION: To date, there are no validated screening scales for small fiber neuropathy (SFN). This study investigated the Small-Fiber Neuropathy and Symptom Inventory Questionnaire (SFN-SIQ) as well as the Small Fiber Neuropathy Screening List (SFNSL) for SFN diagnosis. METHODS: Fifty-five patients were divided into SFN and mixed fiber damage groups. Relevant scales, nerve conduction studies (NCS) and skin biopsies were performed. Relationships between the intraepidermal nerve fiber density (IENFD) and different scales as well as the diagnostic and cut-off values (score at which Youden's index is largest) were determined...
October 27, 2017: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29052170/the-histopathological-evaluation-of-small-fiber-neuropathy-in-patients-with-vitamin-b12-deficiency
#6
Hafize Nalan Güneş, Can Ebru Bekircan-Kurt, Ersin Tan, Sevim Erdem-Özdamar
Small fiber neuropathy (SFN), due to loss of A-delta and unmyelinated C fibers, is a cause of neuropathic pain. Although the patients with vitamin B12 deficiency are included in SFN studies in the literature, there is no histopathological study investigating the small fiber loss solely in patients with vitamin B12 deficiency. In this pilot study, we aim to demonstrate the intraepidermal nerve fiber density (IENFD) in skin punch biopsy of patients with vitamin B12 deficiency. Ten patients with vitamin B12 deficiency suffering from neuropathic pain and as control group ten patients with vitamin B12 deficiency without neuropathic pain were included...
October 19, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/29042446/clinical-and-metabolic-consequences-of-l-serine-supplementation-in-hereditary-sensory-and-autonomic-neuropathy-type-1c
#7
Mari Auranen, Jussi Toppila, Saranya Suriyanarayanan, Museer A Lone, Anders Paetau, Henna Tyynismaa, Thorsten Hornemann, Emil Ylikallio
Hereditary sensory neuropathy type 1 (HSAN1) may be the first genetic neuropathy amenable to a specific mechanism-based treatment, as L-serine supplementation can be used to lower the neurotoxic levels of 1-deoxysphingolipids (1-deoxySL) that cause the neurodegeneration. The treatment is so far untested in HSAN1C caused by variants in the serine palmitoyl transferase subunit 2 (SPTLC2) gene. The aim of this study was to establish whether oral L-serine lowers 1-deoxySL in a patient with HSAN1C, to perform a dose escalation to find the minimal effective dose, and to assess the safety profile and global metabolic effects of the treatment...
October 17, 2017: Cold Spring Harbor Molecular Case Studies
https://www.readbyqxmd.com/read/29042416/nicotine-prevents-and-reverses-paclitaxel-induced-mechanical-allodynia-in-a-mouse-model-of-cipn
#8
S Lauren Kyte, Wisam Toma, Deniz Bagdas, Julie A Meade, Lesley D Schurman, Aron H Lichtman, Zhi-Jian Chen, Egidio Del Fabbro, Xianjun Fang, John W Bigbee, M Imad Damaj, David A Gewirtz
Chemotherapy-induced peripheral neuropathy (CIPN), a consequence of peripheral nerve fiber dysfunction or degeneration, continues to be a dose-limiting and debilitating side effect during and/or after cancer chemotherapy. Paclitaxel, a taxane commonly used to treat breast, lung, and ovarian cancers, causes CIPN in 59-78% of cancer patients. Novel interventions are needed due to the current lack of effective CIPN treatments. Our studies were designed to investigate if nicotine can prevent and/or reverse paclitaxel-induced peripheral neuropathy in a mouse model of CIPN, while ensuring that nicotine will not stimulate lung tumor cell proliferation or interfere with the anti-tumor properties of paclitaxel...
October 17, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/29036361/chronic-pain-and-neuropathy-following-adjuvant-chemotherapy
#9
Lise Ventzel, Caspar S Madsen, Páll Karlsson, Hatice Tankisi, Baris Isak, Anders Fuglsang-Frederiksen, Anders B Jensen, Anni R Jensen, Troels S Jensen, Nanna B Finnerup
Objective: To determine symptoms and characteristics of chronic sensory neuropathy in patients treated with oxaliplatin and docetaxel, including patterns of somatosensory abnormalities, pain descriptors, and psychological functioning. Design: A retrospective cross-sectional study. Setting: A chronic pain research center. Subjects: Thirty-eight patients with chronic peripheral pain and/or dysesthesia following chemotherapy...
September 23, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29024980/comorbid-pain-syndromes-in-hiv-associated-peripheral-neuropathy
#10
Allison Navis, Jocelyn Jiao, Mary Catherine George, David Simpson, Jessica Robinson-Papp
Objective: Peripheral neuropathy (PN) is a common complication of HIV. There is increasing awareness that some forms of PN, particularly small-fiber neuropathies, can be associated with chronic widespread pain syndromes. Given the high prevalence of both PN and chronic pain in HIV, we sought to determine whether patients with a diagnosis of HIV-PN were more likely to experience other chronic pain syndromes. Methods: Data were obtained from the Clinical Data Warehouse maintained by our institution...
August 7, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29021915/optical-coherence-tomography-findings-in-methanol-toxicity
#11
Kendra A Klein, Alexis K Warren, Caroline R Baumal, Thomas R Hedges
BACKGROUND: Methanol toxicity poses a significant public health problem in developing countries, and in Southeast Asia, where the most common source of poisoning is via adulterated liquor in local drinks. Methanol toxicity can have devastating visual consequences and retinal specialists should be aware of the features of this toxic optic neuropathy. The authors report a case of severe systemic methanol toxicity and relatively mild optic neuropathy demonstrating unique retinal changes on optical coherence tomography (OCT)...
2017: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/28970182/pathophysiological-profiles-of-sdt-fatty-rats-a-potential-new-diabetic-peripheral-neuropathy-model
#12
Tatsuya Maekawa, Hironobu Tadaki, Tomohiko Sasase, Yu Motohashi, Katsuhiro Miyajima, Takeshi Ohta, Shinichi Kume
INTRODUCTION: To establish an animal model for diabetic peripheral neuropathy (DPN) at an earlier stage, we performed functional and pathophysiological evaluations in Spontaneously Diabetic Torii (SDT) fatty rats before 16weeks of age. METHODS: Male SDT fatty rats were treated with vehicle or phlorizin (100 to 150mg/kg/day) from 5 to 16weeks. Sprague-Dawley (SD) rats were used as age-matched controls. Body weights and biochemical parameters were measured over time...
September 29, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/28968369/sensory-polyneuropathies
#13
Kelly Graham Gwathmey
PURPOSE OF REVIEW: This article describes the methods of diagnosis and management of the sensory-predominant polyneuropathies. To simplify the approach to this category of patients, sensory-predominant polyneuropathies are divided broadly into either small fiber (or pain-predominant) neuropathies and large fiber (or ataxia-predominant) neuropathies, of which the sensory neuronopathies (dorsal root ganglionopathies) are highlighted. RECENT FINDINGS: Physicians can now easily perform skin biopsies in their offices, allowing access to the gold standard pathologic diagnostic tool for small fiber neuropathies...
October 2017: Continuum: Lifelong Learning in Neurology
https://www.readbyqxmd.com/read/28957343/a-prospective-observational-study-of-patients-with-uncommon-distal-symmetric-painful-small-fiber-neuropathy
#14
Jung-Lung Hsu, Ming-Feng Liao, Hui-Ching Hsu, Yi-Ching Weng, Ai-Lun Lo, Kuo-Hsuan Chang, Hong-Shiu Chang, Hung-Chou Kuo, Chin-Chang Huang, Long-Sun Ro
OBJECTIVE: To investigate the clinical characteristics of patients with uncommon distal symmetric painful small-fiber neuropathy (DSPSFN). METHODS: From September 2012 to September 2014, participants between 18-70 years of age that had DSPSFN defined by clinical signs/symptoms and ID pain > 2 or DN4 > 4 on questionnaires for more than 1 month were included. Participants who had previous historical or laboratory evidence of common etiologies of DSPSFN were excluded...
2017: PloS One
https://www.readbyqxmd.com/read/28954930/hyperpolarization-activated-cyclic-nucleotide-gated-2-hcn2-ion-channels-drive-pain-in-mouse-models-of-diabetic-neuropathy
#15
Christoforos Tsantoulas, Sergio Laínez, Sara Wong, Ishita Mehta, Bruno Vilar, Peter A McNaughton
Diabetic patients frequently suffer from continuous pain that is poorly treated by currently available analgesics. We used mouse models of type 1 and type 2 diabetes to investigate a possible role for the hyperpolarization-activated cyclic nucleotide-gated 2 (HCN2) ion channels as drivers of diabetic pain. Blocking or genetically deleting HCN2 channels in small nociceptive neurons suppressed diabetes-associated mechanical allodynia and prevented neuronal activation of second-order neurons in the spinal cord in mice...
September 27, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28951985/electrochemical-skin-conductance-a-systematic-review
#16
REVIEW
Peter Novak
PURPOSE: Currently available techniques for the evaluation of small fiber neuropathy and related sudomotor function remain suboptimal. Electrochemical skin conductance (ESC) has recently been introduced as a simple noninvasive and fast method for the detection of sudomotor dysfunction. The purpose of this review is to synthesize and appraise research using ESC measurements for sudomotor evaluation in adults. METHODS: Electronic databases including MEDLINE and Google Scholar were searched (up to March 13, 2017)...
September 26, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28915853/low-threshold-unmyelinated-mechanoafferents-can-modulate-pain
#17
Kathrin Habig, Anne Schänzer, Wolfgang Schirner, Gothje Lautenschläger, Benjamin Dassinger, Håkan Olausson, Frank Birklein, Elke R Gizewski, Heidrun H Krämer
BACKGROUND: Human, hairy skin contains a subgroup of C-fibers, the C-low threshold mechanoreceptive afferents ((C-LTMR) C-tactile or C-touch (CT) fibers) that are linked with the signaling of affective aspects of human touch. Recent studies suggest an involvement of these afferents in the modulation of pain in healthy volunteers. Small fiber neuropathy (SFN) is associated with a damage of C-fibers. Therefore, an impairment of C-LTMRs can be assumed. We aimed to elaborate a possible role of CT-afferents in pain modulation by investigating healthy volunteers and SFN-patients...
September 15, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28902413/frequent-genes-in-rare-diseases-panel-based-next-generation-sequencing-to-disclose-causal-mutations-in-hereditary-neuropathies
#18
Maike F Dohrn, Nicola Glöckle, Lejla Mulahasanovic, Corina Heller, Julia Mohr, Christine Bauer, Erik Riesch, Andrea Becker, Florian Battke, Konstanze Hörtnagel, Thorsten Hornemann, Saranya Suriyanarayanan, Markus Blankenburg, Jörg B Schulz, Kristl G Claeys, Burkhard Gess, Istvan Katona, Andreas Ferbert, Debora Vittore, Alexander Grimm, Stefan Wolking, Ludger Schöls, Holger Lerche, G Christoph Korenke, Dirk Fischer, Bertold Schrank, Urania Kotzaeridou, Gerhard Kurlemann, Bianca Dräger, Anja Schirmacher, Peter Young, Beate Schlotter-Weigel, Saskia Biskup
Hereditary neuropathies comprise a wide variety of chronic diseases associated to more than 80 genes identified to date. We herein examined 612 index patients with either a Charcot-Marie-Tooth phenotype, hereditary sensory neuropathy, familial amyloid neuropathy, or small fiber neuropathy using a customized multigene panel based on the next generation sequencing technique. In 121 cases (19.8%), we identified at least one putative pathogenic mutation. Of these, 54.4% showed an autosomal dominant, 33.9% an autosomal recessive, and 11...
September 13, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28898515/age-related-changes-in-and-determinants-of-macular-ganglion-cell-inner-plexiform-layer-thickness-in-normal-chinese-adults
#19
Yan J Huo, Yan Guo, Lei Li, Huai Z Wang, Ya X Wang, Ravi Thomas, Ning L Wang
IMPORTANCE: Consideration of age-related changes in macular ganglion cell-inner plexiform layer (mGCIPL) thickness are important for glaucoma progression analysis. BACKGROUND: To report age-related changes in and the determinants of high-definition optical coherence tomography (HD-OCT) measurements of mGCIPL thickness. DESIGN: Cross-sectional study. PARTICIPANTS: 326 healthy adults. METHODS: All subjects underwent Cirrus HD-OCT measurements of mGCIPL...
September 12, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28895058/a-neuropathic-pain-syndrome-associated-with-hantavirus-infection
#20
Dustin Anderson, Grayson Beecher, Christopher Power, Lindsay Bridgland, Douglas W Zochodne
Hantaviruses are a group of single-stranded RNA viruses of the Bunyaviridae family. "New World" hantaviruses cause hantavirus cardiopulmonary syndrome (HCPS) in North America. HCPS carries with it significant mortality and those patients who survive the disease are often left with substantial morbidity. Neurologic complications of hantavirus infections are rare, with only sparse cases of central nervous system involvement having been documented in the literature. To our knowledge, there are no reports of hantavirus infection contributing to peripheral nervous system dysfunction...
September 11, 2017: Journal of Neurovirology
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