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https://www.readbyqxmd.com/read/29114916/hierarchical-models-for-epidermal-nerve-fiber-data
#1
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/29077516/sfn-siq-sfnsl-and-skin-biopsy-of-55-cases-with-small-fiber-involvement
#2
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
#3
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
#4
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/29029847/the-diagnostic-challenge-of-small-fibre-neuropathy-clinical-presentations-evaluations-and-causes
#5
REVIEW
Astrid J Terkelsen, Páll Karlsson, Giuseppe Lauria, Roy Freeman, Nanna B Finnerup, Troels S Jensen
Small fibre neuropathies are a heterogeneous group of disorders affecting thinly myelinated Aδ-fibres and unmyelinated C-fibres. Although multiple causes of small nerve fibre degeneration have been reported, including via genetic mutations, the cause of small fibre neuropathy remains unknown in up to 50% of cases. The typical clinical presentation of small fibre neuropathy is that of a symmetrical, length-dependent polyneuropathy associated with sensory or autonomic symptoms. More rarely, the clinical presentation is characterised by non-length-dependent, focal, or multifocal symptoms...
November 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28993756/trench-foot-or-non-freezing-cold-injury-as-a-painful-vaso-neuropathy-clinical-and-skin-biopsy-assessments
#6
Praveen Anand, Rosario Privitera, Yiangos Yiangou, Philippe Donatien, Rolfe Birch, Peter Misra
BACKGROUND: Trench foot, or non-freezing cold injury (NFCI), results from cold exposure of sufficient severity and duration above freezing point, with consequent sensory and vascular abnormalities which may persist for years. Based on observations of Trench foot in World War II, the condition was described as a vaso-neuropathy. While some reports have documented nerve damage after extreme cold exposure, sensory nerve fibres and vasculature have not been assessed with recent techniques in NFCI...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28969380/chronic-non-freezing-cold-injury-results-in-neuropathic-pain-due-to-a-sensory-neuropathy
#7
Tom A Vale, Mkael Symmonds, Michael Polydefkis, Kelly Byrnes, Andrew S C Rice, Andreas C Themistocleous, David L H Bennett
Non-freezing cold injury develops after sustained exposure to cold temperatures, resulting in tissue cooling but not freezing. This can result in persistent sensory disturbance of the hands and feet including numbness, paraesthesia and chronic pain. Both vascular and neurological aetiologies of this pain have been suggested but remain unproven. We prospectively approached patients referred for clinical assessment of chronic pain following non-freezing cold injury between 12 February 2014 and 30 November 2016...
October 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28968369/sensory-polyneuropathies
#8
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/28951985/electrochemical-skin-conductance-a-systematic-review
#9
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/28894389/quantification-of-small-fiber-pathology-in-patients-with-sarcoidosis-and-chronic-pain-using-cornea-confocal-microscopy-and-skin-biopsies
#10
Linda Cj Oudejans, Marieke Niesters, Michael Brines, Albert Dahan, Monique van Velzen
Small fiber pathology with concomitant chronic neuropathic pain is a common complication of sarcoidosis. The gold standard of diagnosis of small fiber neuropathy (SFN) is the quantification of small nerve fibers in skin biopsies in combination with patient history and psychophysical tests; a new technique is the quantification of small nerve fibers in the cornea using cornea confocal microscopy (CCM). Here, we studied small fiber morphology in sarcoidosis patients with neuropathic pain using skin biopsies, CCM, and quantitative sensory testing (QST)...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28870579/aberrant-microrna-expression-in-patients-with-painful-peripheral-neuropathies
#11
Mathias Leinders, Nurcan Üçeyler, Anna Thomann, Claudia Sommer
Changes in the neuro-immune balance play a major role in the induction and maintenance of neuropathic pain. We recently reported pathophysiologically relevant alterations in skin and sural nerve cytokine expression in peripheral neuropathies of different etiologies. Immune processes and cytokine expression are under tight control of microRNAs (miRNAs). To identify potential master switches in the neuro-immune balance, we aimed at characterizing inflammation-regulating miRNA profiles in patients with peripheral neuropathies...
September 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28870564/evaluation-of-polymerase-chain-reaction-in-nerve-biopsy-specimens-of-patients-with-hansen-s-disease
#12
Vandana Tiwari, Kiranpreet Malhotra, Kainat Khan, Pradeep K Maurya, Ajai Kumar Singh, Anup Kumar Thacker, Nuzhat Husain, Dinkar Kulshreshtha
BACKGROUND: Pure neuritic variety of leprosy (PNL) presents as peripheral neuropathy with absent skin lesions and negative skin smears. Diagnosing PNL is an uphill task as most of these patients have nonspecific changes on nerve biopsy. In such circumstances, additional molecular diagnostic tools like polymerase chain reaction (PCR) has proven to be useful in diagnosing leprosy. The present study was planned to evaluate the role of PCR in nerve biopsy specimens of patients with PNL. METHODS: Patients attending the neuromuscular clinic from January 2013 to June 2014 with mononeuropathy multiplex underwent detailed diagnostic evaluation to ascertain the cause of neuropathy...
September 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28860329/biomarkers-predict-outcome-in-charcot-marie-tooth-disease-1a
#13
Robert Fledrich, Manoj Mannil, Andreas Leha, Caroline Ehbrecht, Alessandra Solari, Ana L Pelayo-Negro, José Berciano, Beate Schlotter-Weigel, Tuuli J Schnizer, Thomas Prukop, Natalia Garcia-Angarita, Dirk Czesnik, Jana Haberlová, Radim Mazanec, Walter Paulus, Tim Beissbarth, Maggie C Walter, Cmt- Triaal, Jean-Yves Hogrel, Odile Dubourg, Angelo Schenone, Jonathan Baets, Peter De Jonghe, Michael E Shy, Rita Horvath, Davide Pareyson, Pavel Seeman, Peter Young, Michael W Sereda
BACKGROUND: Charcot-Marie-Tooth disease type 1A (CMT1A) is the most common inherited neuropathy, a debilitating disease without known cure. Among patients with CMT1A, disease manifestation, progression and severity are strikingly variable, which poses major challenges for the development of new therapies. Hence, there is a strong need for sensitive outcome measures such as disease and progression biomarkers, which would add powerful tools to monitor therapeutic effects in CMT1A. METHODS: We established a pan-European and American consortium comprising nine clinical centres including 311 patients with CMT1A in total...
November 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28838824/phlebectasia-in-a-finger-in-a-case-of-microscopic-polyangiitis-with-peripheral-polyneuropathy
#14
Jorge Julio Badía Flores, Federico G Arévalo Martínez
The patient was a 56-year-old man with microscopic polyangiitis and symmetrical peripheral polyneuropathy of the extremities who was positive for p-ANCA, EMG pattern of mononeuritis multiplex and skin biopsy showing the presence of nonspecific vasculitis. He had phlebectasia with plethora and tortuous vessels on dorsum of the fingers on both hands, paresis and hypoesthesia of fingers and toes with functional limitations. The administration of prednisone, azathioprine and a cyclophosphamide pulse achieved rapid improvement in the general symptoms, but the changes in the neuropathy occurred very slowly...
August 22, 2017: Reumatología Clinica
https://www.readbyqxmd.com/read/28827483/less-is-more-in-diabetic-neuropathy-diagnosis-comparison-of-quantitative-sudomotor-axon-reflex-and-skin-biopsy
#15
Ahmad R Abuzinadah, Patricia Kluding, Douglas Wright, Linda DʼSilva, Janelle Ryals, Bill Hendry, Omar Jawdat, Laura Herbelin, April L McVey, Richard J Barohn, Mazen M Dimachkie, Mamatha Pasnoor
OBJECTIVES: To compare the frequency of abnormalities in epidermal nerve fiber density (ENFD) and quantitative sudomotor axon reflex (QSART) in patients with diabetic distal symmetric polyneuropathy (DSPN). METHODS: Nerve conduction studies, ENFD, and QSART data were obtained pre- and postexercise, in patients enrolled in a prospective diabetic neuropathy study. McNemar's test was applied to compare the yield of ENFD and QSART. RESULTS: Eighteen patients (58 ± 4 years) were enrolled, with 36 data collection points...
September 2017: Journal of Clinical Neuromuscular Disease
https://www.readbyqxmd.com/read/28815599/the-reduction-of-intraepidermal-p2x3-nerve-fiber-density-correlates-with-behavioral-hyperalgesia-in-a-rat-model-of-nerve-injury-induced-pain
#16
Malik Bechakra, Barthold N Schüttenhelm, Tiziana Pederzani, Pieter A van Doorn, Chris I de Zeeuw, Joost L M Jongen
Skin biopsies from patients with neuropathic pain often show changes in epidermal innervation, although it remains to be elucidated to what extent such changes can be linked to a particular subgroup of nerve fibers and how these changes are correlated with pain intensity. Here, we investigated to what extent behavioral signs of hyperalgesia are correlated with immunohistochemical changes of peptidergic and non-peptidergic epidermal nerve fibers in a rat model of nerve injury-induced pain. Rats subjected to unilateral partial ligation of the sciatic nerve developed significant mechanical and thermal hyperalgesia as tested by the withdrawal responses of the ipsilateral footpad to von Frey hairs and hotplate stimulation...
August 17, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28797868/neuropathic-pain-and-nerve-growth-factor-in-chemotherapy-induced-peripheral-neuropathy-prospective-clinical-pathological-study
#17
R Velasco, X Navarro, M Gil-Gil, M Herrando-Grabulosa, A Calls, J Bruna
CONTEXT: Neuropathic pain can be present in patients developing chemotherapy-induced peripheral neuropathy (CIPN). Nerve growth factor (NGF) is trophic to small sensory fibers and regulates nociception. OBJECTIVES: We investigated the changes in serum NGF and intraepidermal nerve fiber density (IENFD) in skin biopsies of cancer patients receiving neurotoxic chemotherapy in a single-center prospective observational study. METHODS: Patients were evaluated before and after chemotherapy administration...
August 7, 2017: Journal of Pain and Symptom Management
https://www.readbyqxmd.com/read/28758089/diagnosis-of-churg-strauss-syndrome-presented-with-neuroendocrine-carcinoma-a-case-report
#18
Dayun Park, Ho Jun Lee, Kwang Hoon Lee, Bum Sun Kwon, Jin-Woo Park, Ki Yeun Nam, Kyoung Hwan Lee
Churg-Strauss syndrome (CSS) is a rare systemic vasculitis that affect small and medium-sized blood vessels and is accompanied by asthma, eosinophilia, and peripheral neuropathy. This report describes a case of a 52-year-old man who had a history of sinusitis, asthma, and thymus cancer and who had complained of bilateral lower extremity paresthesia and weakness for a month. Peripheral neuropathy was detected by electrodiagnostic studies. Resection of a mediastinal mass, which was diagnosed as thymic neuroendocrine carcinoma, was performed five months before his visit...
June 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/28747449/loss-of-cutaneous-large-and-small-fibers-in-naive-and-l-dopa-treated-pd-patients
#19
Maria Nolano, Vincenzo Provitera, Fiore Manganelli, Rosa Iodice, Annamaria Stancanelli, Giuseppe Caporaso, Annamaria Saltalamacchia, Francesca Califano, Bernardo Lanzillo, Marina Picillo, Paolo Barone, Lucio Santoro
OBJECTIVE: To study small and large fiber pathology in drug-naive and l-dopa-treated patients affected by Parkinson disease (PD) in early phases, before the occurrence of neuropathic electrophysiologic abnormalities. METHODS: We enrolled 85 patients with idiopathic PD (male/female 49/36, age 61.3 ± 9.7 years) without electrophysiologic signs of neuropathy, including 48 participants naive to l-dopa treatment. All patients underwent clinical, functional, and morphologic assessment of sensory and autonomic nerves through dedicated questionnaires, quantitative sensory testing, sympathetic skin response, dynamic sweat test, and punch biopsies from glabrous and hairy skin...
August 22, 2017: Neurology
https://www.readbyqxmd.com/read/28719619/diagnostic-utility-of-corneal-confocal-microscopy-and-intra-epidermal-nerve-fibre-density-in-diabetic-neuropathy
#20
Uazman Alam, Maria Jeziorska, Ioannis N Petropoulos, Omar Asghar, Hassan Fadavi, Georgios Ponirakis, Andrew Marshall, Mitra Tavakoli, Andrew J M Boulton, Nathan Efron, Rayaz A Malik
OBJECTIVES: Corneal confocal microscopy (CCM) is a rapid, non-invasive, reproducible technique that quantifies small nerve fibres. We have compared the diagnostic capability of CCM against a range of established measures of nerve damage in patients with diabetic neuropathy. METHODS: In this cross sectional study, thirty subjects with Type 1 diabetes without neuropathy (T1DM), thirty one T1DM subjects with neuropathy (DSPN) and twenty seven non-diabetic healthy control subjects underwent detailed assessment of neuropathic symptoms and neurologic deficits, quantitative sensory testing (QST), electrophysiology, skin biopsy and corneal confocal microscopy (CCM)...
2017: PloS One
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