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Sobeeh MG, Benmelouka A, Metwally E, Abuhassira MJ, Abdeljalil AM, Nasr SA, El-Helw GO, Doheim MF. Altered brain function and structure in carpal tunnel syndrome: a systematic review and meta-analysis of structural and functional brain imaging. Brain Struct Funct 2024; 229:257-272. [PMID: 38165482 DOI: 10.1007/s00429-023-02737-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 11/21/2023] [Indexed: 01/03/2024]
Abstract
This systematic review with a meta-analysis aimed to identify the altered brain structure and function in carpal tunnel syndrome (CTS) by summarizing the literature about magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), and magnetoencephalography (MEG) outcomes compared to healthy controls (HC). CTS is the most common nerve entrapment in the arm associated with altered peripheral and central nociceptive system. PRISMA guidelines were used to report the outcomes. Six databases were searched for relevant literature (Web of Science, Scopus, PubMed, Sage, EBSCO host, and Cochrane). Eligible studies comparing MRI, fMRI, and MEG findings in people with CTS (present for at least 2 months) and HC through the following parameters: (1) interdigit cortical separation distance, (2) white and grey matter changes, (3) peak latency of M20 wave and recovery function of N20 from the somatosensory cortex (SI), and (4) surface area of activated digit cortical representation. The results from different studies were pooled and a meta-analysis was done. From 17 included, there was a significant reduction of interdigit cortical separation distance of index-middle and index-little fingers in the CTS (SMD = - 0.869, 95% CI (- 1.325, - 0.413), p-value = 0.000) and (SMD = - 0.79, 95% CI (- 1.217, - 0.364), p-value = 0.000), respectively. Middle-little fingers interdigit separation showed no difference (SMD = - 0.2, 95% CI (- 0.903, 1.309), p-value = 0.718). There is evidence supporting the altered brain structure and function in CTS as evidenced by reduction of interdigit cortical separation distance, and excessive blurring and disinhibition of SI, with low resting state functional connectivity. Thus, centrally directed therapeutic approaches might complement peripheral treatments.
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Affiliation(s)
- Mohamed Gomaa Sobeeh
- Department of Physical Therapy for Musculoskeletal Disorders and its Surgery, Faculty of Physical Therapy, Cairo University, Giza, Egypt.
- Department of Physical Therapy for Orthopedics and Orthopedic Surgery, Faculty of Physical Therapy, Sinai University, Ismailia, Egypt.
| | | | | | | | | | - Sara Amr Nasr
- Faculty of Medicine, Alexandria University, Alexandria, Egypt
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Escobar-Sánchez I, Ríos-León M, Taylor J. Long-term bilateral change in pain and sensitivity to high-frequency cutaneous electrical stimulation in healthy subjects depends on stimulus modality: a dermatomal examination. Front Med (Lausanne) 2024; 10:1337711. [PMID: 38293302 PMCID: PMC10825033 DOI: 10.3389/fmed.2023.1337711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 12/30/2023] [Indexed: 02/01/2024] Open
Abstract
Introduction Contradictory changes in pain and sensitivity at long-term following cutaneous 100 Hz high frequency stimulation (HFS) have been previously observed. Thus, we aimed to document long-lasting changes in multimodal sensitivity following HFS, and factors influencing them. Methods Long-lasting changes were assessed with mechanical [brush, von Frey filament (588.2 mN)] and thermal [heat (40°C)/cold (25°C)] bedside sensory testing, and electrical TS (0.2 ms single electrical stimuli), at the homotopic (ipsilateral C6 dermatome), adjacent heterotopic (ipsilateral C5 and C7 dermatomes) and contralateral (contralateral C6 dermatomes) dermatomal sites in a single testing session. TS were applied before and after application of 100 Hz HFS at the ipsilateral C6 dermatome. Subjects rated their sensation and pain intensity to TS, and completed questionnaires related to pain descriptors and quality of life. Results Long-lasting changes in mechanical and cold sensitivity was detected up to 45 min after HFS at homotopic C6 dermatome, and a temporary increase in cold sensitivity at 20 min in the contralateral C6 dermatome (p < 0.05). A slow development of bilateral depotentiation to electrical pain TS was also detected from 40 min after HFS (p < 0.05). Higher HFS-induced mechanical and cold sensitivity was identified in women (p < 0.05). Age and quality of life were associated with pain intensity (p < 0.05). Conclusion Long-term unilateral and bilateral changes in sensation and pain following electrical HFS have been found. These findings may suggest a new insight into the development of persistent pain mechanisms. Further studies are now needed.
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Affiliation(s)
- Isabel Escobar-Sánchez
- Sensorimotor Function Group, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
- Alumna de Doctorado (Ciencias de la Salud), Escuela Internacional de Doctorado, Universidad de Castilla-La Mancha, Ciudad Real, Spain
| | - Marta Ríos-León
- Sensorimotor Function Group, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
- Instituto de Investigación Sanitaria de Castilla-La Mancha (IDISCAM), Toledo, Spain
| | - Julian Taylor
- Sensorimotor Function Group, Hospital Nacional de Parapléjicos (SESCAM), Toledo, Spain
- Instituto de Investigación Sanitaria de Castilla-La Mancha (IDISCAM), Toledo, Spain
- Harris Manchester College, University of Oxford, Oxford, United Kingdom
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Feng B, Gong C, You L, Lin Y, Wang Y, Ip WY, Wang Y. Central Sensitization in Patients with Chronic Pain Secondary to Carpal Tunnel Syndrome and Determinants. J Pain Res 2023; 16:4353-4366. [PMID: 38145037 PMCID: PMC10748611 DOI: 10.2147/jpr.s441786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 12/12/2023] [Indexed: 12/26/2023] Open
Abstract
Purpose Central sensitization (CS) is commonly seen in chronic pain disorders, including neuropathic pain. However, there exist inconsistencies concerning the presence of CS in chronic pain secondary to carpal tunnel syndrome (CTS). CS and neuropathic pain manifestations in CTS remain not well established. Therefore, this study aims to investigate the CS and pain profiles in patients with CTS and to explore the potential determinants associated with CS. Patients and Methods Patients with suspected CTS symptoms lasting 3 months or above and healthy controls were enrolled. History, physical examinations, and nerve conduction studies were employed to confirm the diagnosis and severity of median nerve dysfunction. The central sensitization inventory (CSI) was used to screen CS. Other outcomes included neuropathic pain, CTS-specific symptom severity and functions, emotion, and health-related quality of life. Between-group comparisons were conducted in terms of the CS presence. Logistic regression analysis was performed to identify determinants associated with CS. Results Over 60% of participants with CTS were found with clinical CS, significantly higher than that in the control group. More than 70% of the CTS participants were identified to have possible or very likely neuropathic pain components. In addition, one-fourth of CTS cases had depression or anxiety. Anxiety was associated with an increased risk of developing CS in CTS (adjusted OR=1.31, 95% CI 1.08-1.59), whereas higher self-perceived general health rating was negatively associated with the presence of CS (adjusted OR=0.92, 95% CI 0.88-0.97) in the multivariate adjusted regression model. Conclusion CS is prevalent in patients with CTS. Predominant neuropathic pain characteristics were uncovered in CTS patients as well as comorbid psychological distress. Significant association was found between anxiety and CS presence. Self-perceived general health was inversely related to CS. Further research is warranted to explore the mechanisms of anxiety and central pain processing in painful entrapment neuropathy.
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Affiliation(s)
- Beibei Feng
- Department of Rehabilitation Medicine, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
- Department of Orthopaedics & Traumatology, the University of Hong Kong, Hong Kong, Special Administrative Regions, People’s Republic of China
- Guangdong Provincial Clinical Research Center for Rehabilitation Medicine, Guangzhou, People’s Republic of China
- Biomedical Innovation Center, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Chen Gong
- Department of Rehabilitation Medicine, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
- Guangdong Provincial Clinical Research Center for Rehabilitation Medicine, Guangzhou, People’s Republic of China
- Biomedical Innovation Center, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Longfei You
- Department of Rehabilitation Medicine, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
- Guangdong Provincial Clinical Research Center for Rehabilitation Medicine, Guangzhou, People’s Republic of China
- Biomedical Innovation Center, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Yangyang Lin
- Department of Rehabilitation Medicine, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
- Guangdong Provincial Clinical Research Center for Rehabilitation Medicine, Guangzhou, People’s Republic of China
- Biomedical Innovation Center, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Yafei Wang
- Department of Rehabilitation Medicine, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
- Guangdong Provincial Clinical Research Center for Rehabilitation Medicine, Guangzhou, People’s Republic of China
- Biomedical Innovation Center, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Wing Yuk Ip
- Department of Orthopaedics & Traumatology, the University of Hong Kong, Hong Kong, Special Administrative Regions, People’s Republic of China
| | - Yuling Wang
- Department of Rehabilitation Medicine, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
- Guangdong Provincial Clinical Research Center for Rehabilitation Medicine, Guangzhou, People’s Republic of China
- Biomedical Innovation Center, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, People’s Republic of China
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Fernández-de-Las-Peñas C, Fuensalida-Novo S, Nijs J, Basson A, Plaza-Manzano G, Valera-Calero JA, Arendt-Nielsen L, de-la-Llave-Rincón AI. Carpal Tunnel Syndrome: Neuropathic Pain Associated or Not with a Nociplastic Condition. Biomedicines 2023; 11:1744. [PMID: 37371839 DOI: 10.3390/biomedicines11061744] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 06/14/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023] Open
Abstract
Carpal tunnel syndrome (CTS) has been traditionally classified as primarily a neuropathic condition with or without pain. Precision medicine refers to an evidence-based method of grouping patients based on their susceptibility to biology, prognosis of a particular disease, or in their response to a specific treatment, and tailoring specific treatments accordingly. In 2021, the International Association for the Study of Pain (IASP) proposed a grading system for classifying patients into nociceptive, neuropathic, or nociplastic phenotypes. This position paper presents data supporting the possibility of subgrouping individuals with specific CTS related-pain into nociceptive, neuropathic, nociplastic or mixed-type phenotypes. Carpal tunnel syndrome is a neuropathic condition but can also be comorbid with a nociplastic pain condition. The presence of extra-median symptoms and the development of facilitated pain processing seem to be signs suggesting that specific CTS cases can be classified as the nociplastic pain phenotype. The clinical responses of therapeutic approaches for the management of CTS are inconclusive. Accordingly, the ability to identify the predominant pain phenotype in patients with CTS could likely be problematic for producing efficient treatment outcomes. In fact, the presence of a nociplastic or mixed-type pain phenotype would explain the lack of clinical effect of treatment interventions targeting the carpal tunnel area selectively. We propose a clinical decision tree by using the 2021 IASP classification criteria for identifying the predominant pain phenotype in people with CTS-related pain, albeit CTS being a priori a neuropathic pain condition. The identification of a nociplastic-associated condition requires a more nuanced multimodal treatment approach to achieve better treatment outcomes.
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Affiliation(s)
- César Fernández-de-Las-Peñas
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, 28922 Alcorcón, Spain
- Center for Neuroplasticity and Pain (CNAP), SMI, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, DK-9220 Aalborg, Denmark
| | - Stella Fuensalida-Novo
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, 28922 Alcorcón, Spain
| | - Jo Nijs
- Pain in Motion Research Group (PAIN), Department of Physiotherapy, Human Physiology and Anatomy, Faculty of Physical Education & Physiotherapy, Vrije Universiteit Brussel, 1050 Brussels, Belgium
- Chronic Pain Rehabilitation, Department of Physical Medicine and Physiotherapy, University Hospital Brussels, 1090 Brussels, Belgium
- Unit of Physiotherapy, Department of Health and Rehabilitation, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, 405 30 Gothenburg, Sweden
| | - Annalie Basson
- Department of Physiotherapy, University of the Witwatersrand, Office 23, Khanya Block-West, 7 York Road, Parktown 2193, South Africa
| | - Gustavo Plaza-Manzano
- Department of Radiology, Rehabilitation and Physiotherapy, Complutense University of Madrid, 28040 Madrid, Spain
- Grupo InPhysio, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - Juan A Valera-Calero
- Department of Radiology, Rehabilitation and Physiotherapy, Complutense University of Madrid, 28040 Madrid, Spain
- Grupo InPhysio, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
| | - Lars Arendt-Nielsen
- Center for Neuroplasticity and Pain (CNAP), SMI, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, DK-9220 Aalborg, Denmark
- Department of Gastroenterology & Hepatology, Mech-Sense, Clinical Institute, Aalborg University Hospital, DK-9000 Aalborg, Denmark
- Steno Diabetes Center North Denmark, Clinical Institute, Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Ana I de-la-Llave-Rincón
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, 28922 Alcorcón, Spain
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Georgeto SM, Andraus RAC, de Oliveira Júnior E, da Silva RA, Ngomo S, Fernandes KBP. Bilateral Idiopathic Carpal Tunnel Syndrome: Clinical-Functional Characterization and Efficacy of Two Combined Postoperative Physiotherapeutic Treatments. Orthop Surg 2023. [PMID: 37154094 DOI: 10.1111/os.13705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 01/27/2023] [Accepted: 02/19/2023] [Indexed: 05/10/2023] Open
Abstract
OBJECTIVE To evaluate the efficacy of combined association instrument myofascial mobilization (IASTM) and stretching in patients with idiopathic bilateral carpal tunnel syndrome (CTS) operated on one hand and to analyze the response of the operated (OH) and non-operated (NH) hand according to the sequence of therapies. Research on these parameters has not yet been found in the literature. METHODS Randomized controlled crossover study with 43 participants using the objective and subjective outcome variables. Patients were randomly assigned to two groups: starting with stretching followed by IASTM and starting with IASTM followed by stretching. Then patients underwent surgery on the hand with more severe involvement and physical therapy rehabilitation was started 30 days after for a period of 4 weeks. After the 1-week interval the participants who started with stretching were referred to IASTM and vice versa, following the same previous patterns. The outpatient reassessments took place at 3 to 6 months. Crossover ANOVA and effect sizes were used as analysis methods. RESULTS Time was the most significant outcome for all variables both during therapies and at 6-month follow-up. Regarding response to the combined therapies between OH and NH, there were differences for both OH and NH, with the greatest impact on NH for the palmar grip and VAS variables. The treatment sequences were significant for pain on the NH and mental SF-12, suggesting that starting with IASTM followed by stretching had a superior outcome for these outcomes. CONCLUSION The combination of IASTM with stretching, used in the postoperative period of bilateral idiopathic CTS, proved to be supplementary, with significant results and large effect sizes for most of the outcomes assessed, both during the time of application of the therapies and in the 6-month follow-up for both hands, and may constitute a viable therapeutic alternative for this population.
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Affiliation(s)
- Sergio Murilo Georgeto
- Department of Neurosurgery, Irmandade da Santa Casa de Londrina (ISCAL); Doctoral Program in Rehabilitation Sciences UEL/UNOPAR, Universidade Pitágoras UNOPAR, Londrina, PR, Brazil
| | | | - Eros de Oliveira Júnior
- Instituto Avançado de Ensino, Pesquisa e Tecnologia de Londrina (IAEPETEL), Londrina, PR, Brazil
| | - Rubens A da Silva
- Département des Sciences de la Santé, Centre Intersectoriel en Santé Durable, Laboratoire de Recherche BioNR, Université du Québec à Chicoutimi (UQAC); Centre Intégré de Santé et Services Sociaux du Saguenay-Lac-Saint-Jean (CIUSSS SLSJ), Services Spécialisés de Gériatrie - Hôpital de La Baie, Saguenay, Québec, Canada
| | - Suzy Ngomo
- Département des Sciences de la Santé, Centre Intersectoriel en Santé Durable, Laboratoire de recherche BioNR, Université du Québec à Chicoutimi (UQAC), Saguenay, Québec, Canada
| | - Karen Barros Parron Fernandes
- School of Medicine, Pontifical Catholic University of Parana (PUCPR), Londrina, PR, Brazil; Département des Sciences de la Santé, Centre Intersectoriel en Santé Durable, Laboratoire de recherche BioNR, Université du Québec à Chicoutimi (UQAC), Saguenay, Québec, Canada; Instituto de Ensino, Pesquisa e Inovação da Irmandade da Santa Casa de Londrina (IEPI-ISCAL), Londrina, PR, Brazil
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Alhassani G, Liston MB, Clothier PJ, Schabrun SM. Interhemispheric Inhibition Between Primary Sensory Cortices is not Influenced by Acute Muscle Pain. THE JOURNAL OF PAIN 2022; 23:1177-1186. [PMID: 35131448 DOI: 10.1016/j.jpain.2022.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 12/19/2021] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
Bilateral deficits in sensorimotor function have been observed in unilateral musculoskeletal pain conditions. Altered interhemispheric inhibition (IHI) between primary sensory cortices (S1s) is one mechanism that could explain this phenomenon. However, IHI between S1s in response to acute muscle pain, and the relationship between IHI and pressure pain sensitivity in the unaffected limb have not been examined. In 21 healthy individuals, IHI was assessed using somatosensory evoked potentials in response to paired median nerve electrical stimulation at: 1) baseline; 2) immediately following pain resolution; and 3) at 30-minutes follow-up. Acute muscle pain was induced by injection of hypertonic saline into the right abductor pollicis brevis (APB) muscle. Pressure pain thresholds were assessed at the right and left APB muscles before and 30-minutes after pain resolution. Compared to baseline, IHI from the affected to unaffected S1 was unaltered in response to acute muscle pain immediately following pain resolution, or at 30-minutes follow-up. Pressure pain thresholds were reduced over the right (P = .001) and left (P = .001) APB muscles at 30-minutes follow-up. These findings suggest IHI between S1s is unaffected by acute, short-lasting muscle pain, despite the development of increased sensitivity to pressure in the unaffected APB muscle. PERSPECTIVE: IHI from the affected S1 (contralateral to the side of pain) to unaffected S1 is unaltered following the resolution of acute muscle pain. This finding suggests that IHI between S1s may not be relevant in the development of bilateral sensorimotor symptoms in unilateral pain conditions.
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Affiliation(s)
- Ghufran Alhassani
- School of Health Sciences, Western Sydney University, Penrith, NSW, Australia
| | - Matthew B Liston
- Centre for Human and Applied Physiological Sciences, Kings College, London, UK
| | - Peter J Clothier
- School of Health Sciences, Western Sydney University, Penrith, NSW, Australia
| | - Siobhan M Schabrun
- School of Health Sciences, Western Sydney University, Penrith, NSW, Australia; Centre for Pain IMPACT, Neuroscience Research Australia, Sydney, NSW, Australia.
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Saggaf MM, Evangelista JV, Novak CB, Anastakis DJ. Evaluation of Cold Sensitivity in Patients With Upper Extremity Nerve Compression Syndromes: A Scoping Review. J Hand Surg Am 2022; 47:688.e1-688.e12. [PMID: 34556393 DOI: 10.1016/j.jhsa.2021.06.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 04/06/2021] [Accepted: 06/17/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE The aim of this study was to review the literature to determine the prevalence of cold sensitivity in upper extremity nerve compression syndromes and the impact of treating nerve compression syndromes on cold sensitivity. METHODS Following a standardized scoping review protocol, this study included interventional and observational study designs assessing patients with cold sensitivity and upper extremity nerve compression syndromes. Review articles, case reports, and small case series (n < 5) were excluded. The abstracts and eligible full texts were screened by 2 independent reviewers. Data were extracted and reported according to PRISMA extension for scoping reviews statement. RESULTS Three databases were searched (Ovid MEDLINE, Ovid EMBASE, and CINAHL on EBSCO); 274 references were reviewed. Fifteen studies from the database search and 8 studies from the reference search were eligible for this review (n = 23). Two interventional and 21 observational studies were identified. The most common method for assessing cold sensitivity was cold pain threshold testing (n = 12), followed by subjective patient reporting (n = 4). The Cold Intolerance Symptom Severity questionnaire was the most common validated patient-reported outcome questionnaire used in the studies (n = 3). Cold sensitivity was most commonly reported in carpal tunnel syndrome (96% of the studies). The prevalence of cold sensitivity in nerve compression syndromes ranged from 20% to 69%. Nerve decompression improved the severity of cold sensitivity in 5 of 6 studies where cold sensitivity was studied. CONCLUSIONS There is heterogenicity in the studies assessing cold sensitivity in nerve compression syndromes. Despite moderate prevalence in patients with carpal tunnel syndrome, cold sensitivity is understudied. Within the limitations of eligible studies reviewed, surgical decompression improved the severity of cold sensitivity in some studies. TYPE OF STUDY/LEVEL OF EVIDENCE Therapeutic IV.
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Affiliation(s)
- Moaath M Saggaf
- Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Toronto Western Hospital Hand Program, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Division of Plastic and Reconstructive Surgery, Department of Surgery, King Abdulaziz University, Jeddah, Saudi Arabia.
| | - Jeunice Vianca Evangelista
- Toronto Western Hospital Hand Program, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada
| | - Christine B Novak
- Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Dimitri J Anastakis
- Division of Plastic and Reconstructive Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Toronto Western Hospital Hand Program, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada; Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
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Dilley A, Harris M, Barbe MF, Bove GM. Aberrant Neuronal Activity in a Model of Work-Related Upper Limb Pain and Dysfunction. THE JOURNAL OF PAIN 2022; 23:852-863. [PMID: 34958943 PMCID: PMC9086086 DOI: 10.1016/j.jpain.2021.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 10/26/2021] [Accepted: 12/03/2021] [Indexed: 05/03/2023]
Abstract
Work-related musculoskeletal disorders associated with intense repetitive tasks are highly prevalent. Painful symptoms associated with such disorders can be attributed to neuropathy. In this study, we characterized the neuronal discharge from the median nerve in rats trained to perform an operant repetitive task. After 3-weeks of the task, rats developed pain behaviors and a decline in grip strength. Ongoing activity developed in 17.7% of slowly conducting neurons at 3-weeks, similar to neuritis. At 12-weeks, an irregular high frequency neuronal discharge was prevalent in >88.4% of slow and fast conducting neurons. At this time point, 8.3% of slow and 21.2% of fast conducting neurons developed a bursting discharge, which, combined with a reduction in fast-conducting neurons with receptive fields (38.4%), is consistent with marked neuropathology. Taken together, we have shown that an operant repetitive task leads to an active and progressive neuropathy that is characterized by marked neuropathology following 12-weeks task that mainly affects fast conducting neurons. Such aberrant neuronal activity may underlie painful symptoms in patients with work-related musculoskeletal disorders. PERSPECTIVE: Aberrant neuronal activity, similar to that reported in this study, may contribute to upper limb pain and dysfunction in patients with work-related musculoskeletal disorders. In addition, profiles of instantaneous frequencies may provide an effective way of stratifying patients with painful neuropathies.
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Affiliation(s)
- Andrew Dilley
- Department of Neuroscience, Brighton and Sussex Medical School, University of Sussex, Brighton, England
| | - Michele Harris
- Center for Translational Medicine, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania
| | - Mary F Barbe
- Center for Translational Medicine, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania
| | - Geoffrey M Bove
- Center for Translational Medicine, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania; Bove Consulting, Kennebunkport, Maine.
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Bittencourt JV, Bezerra MC, Pina MR, Reis FJJ, de Sá Ferreira A, Nogueira LAC. Use of the painDETECT to discriminate musculoskeletal pain phenotypes. Arch Physiother 2022; 12:7. [PMID: 35172904 PMCID: PMC8851806 DOI: 10.1186/s40945-022-00129-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 01/11/2022] [Indexed: 12/02/2022] Open
Abstract
Background Musculoskeletal pain patients present similar pain characteristics regardless of the clinical diagnosis. PainDETECT questionnaire is useful for screening neuropathic-like symptoms in many musculoskeletal conditions. However, no previous studies compared pain phenotypes of patients with musculoskeletal pain using the painDETECT. Therefore, the current study aimed to compare the pain characteristics of patients with musculoskeletal pain classified according to the painDETECT as nociceptive pain, unclear, and neuropathic-like symptoms. Methods A cross-sectional study was conducted in 308 participants with musculoskeletal pain. Demographic and clinical characteristics of the participants were examined. Neuropathic-like symptoms, pain intensity, pain area, Central Sensitization-related sign and symptoms, functional limitation, and conditioned pain modulation were assessed in patients with musculoskeletal pain. Independent one-way analysis of variance (ANOVA) was used to test for between-group differences for the outcome measures with continuous variables and Pearson chi-square test verified between-group differences on the efficiency of the conditioned pain modulation. Results Participants had a mean age of 52.21 (±15.01) years old and 220 (71.42%) were females. One hundred seventy-three (56.16%) participants present nociceptive pain, 69 (22.40%) unclear, and 66 (21.42%) neuropathic-like symptoms. A one-way ANOVA showed differences for the pain intensity [F (2,305) = 20.097; p < .001], pain area [F (2,305) = 28.525; p < .001], Central Sensitization-related sign and symptoms [F (2,305) = 54.186; p < .001], and functional limitation [F (2,256) = 8.061; p < .001]. However, conditioned pain modulation was similarly impaired among the three groups (X2 = 0.333, p = 0.847). Conclusion Patients with neuropathic-like symptoms revealed unfavorable pain characteristics compared to their counterparts, including pain intensity, generalized pain, Central Sensitization-related sign and symptoms, and functional limitation.
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Affiliation(s)
- Juliana Valentim Bittencourt
- Rehabilitation Science Postgraduate Program at Augusto Motta University Centre (UNISUAM), Paris, 84, Bonsucesso, Rio de Janeiro, RJ, CEP 21041-020, Brazil.
| | - Márcia Cliton Bezerra
- Rehabilitation Science Postgraduate Program at Augusto Motta University Centre (UNISUAM), Paris, 84, Bonsucesso, Rio de Janeiro, RJ, CEP 21041-020, Brazil
| | - Mônica Rotondo Pina
- Rehabilitation Science Postgraduate Program at Augusto Motta University Centre (UNISUAM), Paris, 84, Bonsucesso, Rio de Janeiro, RJ, CEP 21041-020, Brazil
| | - Felipe José Jandre Reis
- Physiotherapy Department at Federal Institute of Rio de Janeiro (IFRJ), Rio de Janeiro, Brazil
| | - Arthur de Sá Ferreira
- Rehabilitation Science Postgraduate Program at Augusto Motta University Centre (UNISUAM), Paris, 84, Bonsucesso, Rio de Janeiro, RJ, CEP 21041-020, Brazil
| | - Leandro Alberto Calazans Nogueira
- Rehabilitation Science Postgraduate Program at Augusto Motta University Centre (UNISUAM), Paris, 84, Bonsucesso, Rio de Janeiro, RJ, CEP 21041-020, Brazil.,Physiotherapy Department at Federal Institute of Rio de Janeiro (IFRJ), Rio de Janeiro, Brazil
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10
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Pain mechanisms in carpal tunnel syndrome: a systematic review and meta-analysis of quantitative sensory testing outcomes. Pain 2021; 163:e1054-e1094. [PMID: 35050958 DOI: 10.1097/j.pain.0000000000002566] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 12/08/2021] [Indexed: 11/27/2022]
Abstract
ABSTRACT Carpal tunnel syndrome (CTS) is the most common nerve compression in the arm. A mix of peripheral and central contributions on quantitative sensory testing (QST) has been reported in the literature. Thus, this systematic review or meta-analysis aimed to identify the dominant sensory phenotype and draw conclusive evidence about the presence of central sensitization (CS) in CTS. Based on an a priori published protocol and using PRISMA guidelines, 7 databases were searched (Embase, Web of Science, Scopus, PubMed, SAGE, EBSCOhost, and ProQuest). Eligible studies compared the QST findings of individuals with subacute and chronic CTS with those of healthy controls through thermal, mechanical, and vibration detection thresholds; thermal, pressure, and mechanical pain thresholds; mechanical pain sensitivity; presence of allodynia; wind-up ratio; and conditioned pain modulation. Thirty-seven studies were included in the qualitative analysis. Results showed a significant loss of all detection thresholds of hand median nerve territories and hand extramedian areas (little finger and hand dorsum) in CTS (P < 0.05) but no significant difference (P > 0.05) in wind-up ratio, cold, heat, or mechanical pain thresholds of the median nerve territories. Furthermore, there was a significant increase in mechanical pain sensitivity in median nerve territories and remotely in the forearm (P < 0.05) and a significant gain in pressure and heat pain thresholds in the carpal area (P < 0.05). Conditioned pain modulation was impaired in CTS. Hypoesthesia and increased thermal and mechanical pain ratings are the dominant sensory phenotype with inconclusive evidence about CS in CTS due to the heterogenous results of thermal and mechanical pain thresholds.
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11
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Schmid AB, Fundaun J, Tampin B. [Entrapment neuropathies: a contemporary approach to pathophysiology, clinical assessment, and management : German version]. Schmerz 2021; 35:419-433. [PMID: 34505948 DOI: 10.1007/s00482-021-00584-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/16/2021] [Indexed: 10/20/2022]
Abstract
Entrapment neuropathies such as carpal tunnel syndrome, radiculopathies, or radicular pain are the most common peripheral neuropathies and also the most common cause for neuropathic pain. Despite their high prevalence, they often remain challenging to diagnose and manage in a clinical setting. Summarising the evidence from both preclinical and clinical studies, this review provides an update on the aetiology and pathophysiology of entrapment neuropathies. Potenzial mechanisms are put in perspective with clinical findings. The contemporary assessment is discussed and diagnostic pitfalls highlighted. The evidence for the noninvasive and surgical management of common entrapment neuropathies is summarised and future areas of research are identified.
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Affiliation(s)
- Annina B Schmid
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford University, West Wing Level 6, OX3 9DU, Oxford, Großbritannien.
| | - Joel Fundaun
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford University, West Wing Level 6, OX3 9DU, Oxford, Großbritannien.,High Country Physical Therapy, Laramie, WY, USA
| | - Brigitte Tampin
- Department of Physiotherapy, Sir Charles Gairdner Hospital, Perth, Westaustralien, Australien.,School of Physiotherapy and Exercise Science, Curtin University, Westaustralien, Australien.,Fakultät Wirtschafts- und Sozialwissenschaften, Hochschule Osnabrück, Osnabrück, Deutschland
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12
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Matesanz-García L, Cáceres-Pajuelo JE, Cuenca-Martínez F, La Touche R, Goicoechea-García C, Fernández-Carnero J. Effects of neural mobilizations through movement representation techniques for the improvement of neural mechanosensitivity of the median nerve region: a randomized controlled trial. Somatosens Mot Res 2021; 38:267-276. [PMID: 34404324 DOI: 10.1080/08990220.2021.1964463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
PURPOSE The main objective was to compare the effects of neural mobilization (NM), NM performed through mirror therapy (MT), NM performed through action observation (AO) training and finally classic rehabilitation program (mobility and strength) exercises on neural mechanosensitivity, widespread of proximal and distal pain and pressure pain thresholds (PPT). The second objective was to assess the effects of these interventions on handgrip strength, conditioned pain modulation, motor imagery ability and temporal summation. MATERIALS AND METHODS Single-blinded randomized controlled trial. Fifty-four healthy subjects were randomly assigned to each group. Neural mechanosensitivity, widespread pain and PPT were the main variables. The secondary variables included handgrip strength, conditioned pain modulation, motor imagery ability and temporal summation. RESULTS All groups showed significant differences in time*factor for neural mechanosensitivity (p = 0.001), PPT in the dermatome of the median nerve (p = 0.007), PPT at carpal tunnel (p < 0.05) and proximal widespread (p = 0.01). No differences were found for distal widespread, conditioned pain modulation, handgrip strength motor imagery ability or temporal summation (p > 0.05). There is an absence of statistically significant differences between groups. CONCLUSIONS NM through movement representation techniques can reduce mechanosensitivity and mechanical hyperalgesia in the median nerve dermatome and forearm, although no differences were found between groups.
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Affiliation(s)
- Luis Matesanz-García
- Escuela Internacional de Doctorado, Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | | | - Ferran Cuenca-Martínez
- Departamento de Fisioterapia, Centro Superior de Estudios Universitarios La Salle. Universidad Autónoma de Madrid, Madrid, Spain.,Motion in Brains Research Group, Institute of Neuroscience and Sciences of the Movement (INCIMOV), Centro Superior de Estudios Universitarios La Salle. Universidad Autónoma de Madrid, Madrid, Spain
| | - Roy La Touche
- Departamento de Fisioterapia, Centro Superior de Estudios Universitarios La Salle. Universidad Autónoma de Madrid, Madrid, Spain.,Motion in Brains Research Group, Institute of Neuroscience and Sciences of the Movement (INCIMOV), Centro Superior de Estudios Universitarios La Salle. Universidad Autónoma de Madrid, Madrid, Spain.,Instituto de Dolor Craneofacial y Neuromusculoesquelético (INDCRAN), Madrid, Spain
| | | | - Josué Fernández-Carnero
- Motion in Brains Research Group, Institute of Neuroscience and Sciences of the Movement (INCIMOV), Centro Superior de Estudios Universitarios La Salle. Universidad Autónoma de Madrid, Madrid, Spain.,Grupo Multidisciplinar de Investigación y Tratamiento del Dolor, Grupo de Excelencia Investigadora URJC-Banco de Santander, Madrid, Spain.,La Paz Hospital Institute for Health Research, IdiPAZ, Madrid, Spain.,Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Rey Juan Carlos University, Madrid, Spain
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13
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Liew BXW, de-la-Llave-Rincón AI, Arias-Buría JL, Ortega-Santiago R, Fernández-de-Las-Peñas C. Understanding the Psychophysiological Mechanisms Related to Widespread Pressure Pain Hyperalgesia Underpinning Carpal Tunnel Syndrome: A Network Analysis Approach. PAIN MEDICINE 2021; 22:2708-2717. [PMID: 34343327 DOI: 10.1093/pm/pnab241] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
OBJECTIVE Current evidence suggests that carpal tunnel syndrome (CTS) involves widespread pressure pain sensitivity as manifestion of central sensitization. This study aimed to quantify mechanisms driving widespread pressure pain hyperalgesia in CTS by using network analysis. DESIGN Cross-sectional. SETTING Urban hospital. SUBJECTS 120 women with CTS who participated in a previous randomized clinical trial. METHODS Pain intensity, related-function, symptom's severity, depressive levels, and pressure pain threshold (PPTs) over median, radial and ulnar nerves, the cervical spine, the carpal tunnel, and the tibialis anterior were collected. Network analysis was used to quantify the adjusted correlations between the modelled variables, and to determine the centrality indices of each variable (i.e., the degree of connection with other symptoms in the network). RESULTS The estimated network showed several local associations between clinical variables and the psychophysical outcomes separately. The edges with the strongest weights were between PPT over the median and radial nerves (ρ: 0.34), function and depressive levels (ρ: 0.30), and PPT over the carpal tunnel and tibialis anterior (ρ: 0.29). The most central variables were PPT over the tibialis anterior (the highest Strength centrality), and PPT over the carpal tunnel (the highest Closeness and Betweenness centrality). CONCLUSIONS This is the first study to apply network analysis to understand the multivariate mechanisms of individuals with CTS. Our findings support a model where clinical, depression, and widespread pressure pain sensitivity are connected, albeit within separate clusters. Clinical implications of current findings, such as developing treatments targeting these mechanisms, are also discussed.
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Affiliation(s)
- Bernard X W Liew
- School of Sport, Rehabilitation and Exercise Sciences, University of Essex, Colchester, United Kingdom
| | - Ana I de-la-Llave-Rincón
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | - José L Arias-Buría
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | - Ricardo Ortega-Santiago
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | - César Fernández-de-Las-Peñas
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
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14
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Spectral Clustering Reveals Different Profiles of Central Sensitization in Women with Carpal Tunnel Syndrome. Symmetry (Basel) 2021. [DOI: 10.3390/sym13061042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Identification of subgroups of patients with chronic pain provides meaningful insights into the characteristics of a specific population, helping to identify individuals at risk of chronification and to determine appropriate therapeutic strategies. This paper proposes the use of spectral clustering (SC) to distinguish subgroups (clusters) of individuals with carpal tunnel syndrome (CTS), making use of the obtained patient profiling to argue about potential management implications. SC is a powerful algorithm that builds a similarity graph among the data points (the patients), and tries to find the subsets of points that are strongly connected among themselves, but weakly connected to others. It was chosen due to its advantages with respect to other simpler clustering techniques, such as k-means, and the fact that it has been successfully applied to similar problems. Clinical (age, duration of symptoms, pain intensity, function, and symptom severity), psycho-physical (pressure pain thresholds—PPTs—over the three main nerve trunks of the upper extremity, cervical spine, carpal tunnel, and tibialis anterior), psychological (depressive levels), and motor (pinch tip grip force) variables were collected in 208 women with clinical/electromyographic diagnosis of CTS, whose symptoms usually started unilaterally but eventually evolved into bilateral symmetry. SC was used to identify clusters of patients without any previous assumptions, yielding three clusters. Patients in cluster 1 exhibited worse clinical features, higher widespread pressure pain hyperalgesia, higher depressive levels, and lower pinch tip grip force than the other two. Patients in cluster 2 showed higher generalized thermal pain hyperalgesia than the other two. Cluster 0 showed less hypersensitivity to pressure and thermal pain, less severe clinical features, and more normal motor output (tip grip force). The presence of subgroups of individuals with different altered nociceptive processing (one group being more sensitive to pressure pain and another group more sensitive to thermal pain) could lead to different therapeutic programs.
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15
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Ottiger-Boettger K, Ballenberger N, Landmann G, Stockinger L, Tampin B, Schmid A. Somatosensory profiles in patients with non-specific neck-arm pain with and without positive neurodynamic tests. Musculoskelet Sci Pract 2020; 50:102261. [PMID: 33068902 DOI: 10.1016/j.msksp.2020.102261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/25/2020] [Accepted: 09/14/2020] [Indexed: 11/25/2022]
Abstract
Despite normal neurological integrity tests, some patients with non-specific neck-arm pain (NSNAP) have heightened nerve mechanosensitivity upon neurodynamic testing. The aim of this study was to determine whether or not a nerve dysfunction is present in patients with positive neurodynamic tests compared to those with negative neurodynamic tests or healthy controls. Somatosensory profiling using quantitative sensory testing (QST) was established in 40 consecutive patients with unilateral NSNAP; 23 had positive upper limb neurodynamic tests (ULNTPOS) and 17 had negative neurodynamic tests (ULNTNEG) and in 26 healthy controls. QST included measurement of thermal and mechanical detection and pain thresholds in the maximal pain area on the symptomatic side as well as the corresponding contralateral area. Fifty-seven percent of patients with NSNAP had positive neurodynamic tests. Somatosensory profiling revealed a loss of function phenotype in NSNAP patients compared to healthy controls both in the maximal pain area and asymptomatic side. Hyperalgesia (cold, heat and pressure) was present bilaterally in both NSNAP groups. Direct comparison between the patient groups revealed no significant differences in somatosensory profiles. However, the ULNTPOS group demonstrated sensory loss compared to healthy controls in more parameters than the ULNTNEG group. The ULNTNEG subgroup represented an intermediate phenotype between ULNTPOS patients and healthy controls in most detection thresholds as well as thermal and pressure pain thresholds. Even though patients with NSNAP present as a spectrum, it remains unclear whether the sensory changes are indicative of a nerve dysfunction/lesion or rather a marker of altered central pain processing.
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Affiliation(s)
| | - Nikolaus Ballenberger
- Faculty of Business Management and Social Sciences, Hochschule Osnabrück, University of Applied Sciences, Osnabrück, Germany.
| | - Gunther Landmann
- Centre for Pain Medicine, Swiss Paraplegic Centre, Nottwil, Switzerland.
| | - Lenka Stockinger
- Centre for Pain Medicine, Swiss Paraplegic Centre, Nottwil, Switzerland.
| | - Brigitte Tampin
- Faculty of Business Management and Social Sciences, Hochschule Osnabrück, University of Applied Sciences, Osnabrück, Germany; Department of Physiotherapy, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia; School of Physiotherapy and Exercise Science, Curtin University, Western Australia, Australia.
| | - Annina Schmid
- Nuffield Department of Clinical Neurosciences, Oxford University, John Radcliffe Hospital, Headley Way, Oxford, UK.
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16
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Defrin R, Dekel-Steinkeller M, Urca G. Some like it hot: Preference for temperature and pungency consumption is associated with sensitivity to noxious heat. Eur J Pain 2020; 25:473-484. [PMID: 33089561 DOI: 10.1002/ejp.1686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 10/15/2020] [Accepted: 09/03/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND Individuals vary in their temperature and pungency preferences; whereas some individuals prefer to bath in, or consume food and beverages at very high temperatures, others prefer lukewarm temperatures. Similarly, pungent food may be preferred by some, but not by others. The aim was to investigate, for the first time whether temperature and pungency preferences are associated with variations in thermal sensitivity or ethnic origin related to pungency consumption. METHODS 115 healthy volunteers participated. The thresholds for warm (WST) and heat-pain (HPT) sensations were measured over the tongue and dorsal hand, and the participants' preferred drinking and bath temperatures were measured. In addition, data on the participants' ethnic background as well as temperature and pungency preferences and household habits regarding eating, drinking and bathing were collected. RESULTS The reported drinking and bathing preferences correlated significantly with the measured drinking and bath temperatures, respectively, validating subjects' reports. Tongue and hand HPT, but not WST, correlated with both the reported and the measured drinking and bathing preferences, as well as with pungency preferences. Neither ethnic origin nor gender affected HPT or temperature preferences; however, males preferred a greater level of spiciness than females. CONCLUSIONS The association of the reported and measured preferences with noxious heat sensitivity in both relevant and irrelevant body regions, and lack of an ethnicity effect may suggest that these qualities are innate. The association of HPT and spiciness preferences correspond with the mutual activation of the tongue vanilloid receptors by noxious heat and capsaicin. SIGNIFICANCE People vary with regard to their temperature and spiciness preferences for reasons yet unknown. The study revealed that these preferences correlate with one another and were associated with the sensitivity to noxious heat but not with age, gender and cultural background, which suggests that they may be innate.
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Affiliation(s)
- Ruth Defrin
- Department Physical Therapy, School of Health Profession and Sagol School of Neuroscience, Tel-Aviv University, Tel-Aviv, Israel
| | - Michal Dekel-Steinkeller
- The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Gideon Urca
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv Aviv University, Tel-Aviv, Israel
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17
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Mathematical Modeling for Neuropathic Pain: Bayesian Linear Regression and Self-Organizing Maps Applied to Carpal Tunnel Syndrome. Symmetry (Basel) 2020. [DOI: 10.3390/sym12101581] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A better understanding of the connection between risk factors associated with pain and function may assist therapists in optimizing therapeutic programs. This study applied mathematical modeling to analyze the relationship of psychological, psychophysical, and motor variables with pain, function, and symptom severity using Bayesian linear regressions (BLR) and self-organizing maps (SOMs) in carpal tunnel syndrome (CTS). The novelty of this work was a transfer of the symmetry mathematical background to a neuropathic pain condition, whose symptoms can be either unilateral or bilateral. Duration of symptoms, pain intensity, function, symptom severity, depressive levels, pinch tip grip force, and pressure pain thresholds (PPTs) over the ulnar, radial, and median nerve trunks, the cervical spine, the carpal tunnel, and the tibialis anterior were collected in 208 women suffering from CTS. The first BLR model revealed that symptom severity, PPTs over the radial nerve, and function had significant correlations with pain intensity. The second BLR showed that symptom severity, depressive levels, pain intensity, and years with pain were associated with function. The third model demonstrated that pain intensity and function were associated with symptom severity. The SOMs visualized these correlations among variables, i.e., clinical, psychophysical, and physical, and identified a subgroup of women with CTS exhibiting worse clinical features, higher pressure sensitivity, and lower pinch tip grip force. Therefore, the application of mathematical modeling identified some interactions among the intensity of pain, function, and symptom severity in women with CTS.
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18
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Sault JD, Jayaseelan DJ, Mischke JJ, Post AA. The Utilization of Joint Mobilization As Part of a Comprehensive Program to Manage Carpal Tunnel Syndrome: A Systematic Review. J Manipulative Physiol Ther 2020; 43:356-370. [PMID: 32861521 DOI: 10.1016/j.jmpt.2020.02.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 10/23/2019] [Accepted: 02/05/2020] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The purpose of this review is to identify the role of joint mobilization for individuals with Carpal tunnel syndrome (CTS). METHODS A systematic search of 5 electronic databases (PubMed, CINAHL, Scopus, Cochrane Central Register of Controlled Trials, and SPORTDiscus) was performed to identify eligible full-text randomized clinical trials related to the clinical question. Joint mobilization had to be included in one arm of the randomized clinical trials to be included. Two reviewers independently participated in each step of the screening process. A blinded third reviewer assisted in cases of discrepancy. The PEDro scale was used to assess quality. RESULTS Ten articles were included after screening 2068 titles. In each article where joint mobilization was used, positive effects in pain, function, or additional outcomes were noted. In most cases, the intervention group integrating joint mobilization performed better than the comparison group not receiving joint techniques. CONCLUSION In the articles reviewed, joint mobilization was associated with positive clinical effects for persons with CTS. No studies used joint mobilization in isolation; therefore, results must be interpreted cautiously. This review indicates that joint mobilization might be a useful adjunctive intervention in the management of CTS.
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Affiliation(s)
- Josiah D Sault
- University of Illinois Hospital and Health Sciences System, Chicago, Illinois
| | - Dhinu J Jayaseelan
- Department of Health, Human Function and Rehabilitation Sciences, The George Washington University, Washington, DC.
| | - John J Mischke
- School of Physical Therapy and Rehabilitation Science, University of Montana, Missoula, Montana
| | - Andrew A Post
- Department of Physical Therapy and Rehabilitation Science, University of Iowa, Iowa City, Iowa
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19
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Schmid AB, Fundaun J, Tampin B. Entrapment neuropathies: a contemporary approach to pathophysiology, clinical assessment, and management. Pain Rep 2020; 5:e829. [PMID: 32766466 PMCID: PMC7382548 DOI: 10.1097/pr9.0000000000000829] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 05/04/2020] [Accepted: 05/30/2020] [Indexed: 12/18/2022] Open
Abstract
Entrapment neuropathies such as carpal tunnel syndrome, radiculopathies, or radicular pain are the most common peripheral neuropathies and also the most common cause for neuropathic pain. Despite their high prevalence, they often remain challenging to diagnose and manage in a clinical setting. Summarising the evidence from both preclinical and clinical studies, this review provides an update on the aetiology and pathophysiology of entrapment neuropathies. Potential mechanisms are put in perspective with clinical findings. The contemporary assessment is discussed and diagnostic pitfalls highlighted. The evidence for the noninvasive and surgical management of common entrapment neuropathies is summarised and future areas of research are identified.
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Affiliation(s)
- Annina B. Schmid
- Nuffield Department of Clinical Neurosciences, Oxford University, Oxford, United Kingdom
| | - Joel Fundaun
- Nuffield Department of Clinical Neurosciences, Oxford University, Oxford, United Kingdom
- High Country Physical Therapy, Laramie, WY, USA
| | - Brigitte Tampin
- Department of Physiotherapy, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia
- School of Physiotherapy and Exercise Science, Curtin University, Western Australia, Australia
- Faculty of Business Management and Social Sciences, Hochschule Osnabrück, University of Applied Sciences, Osnabrück, Germany
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20
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Kawamoto H, Iwatsuki K, Kurimoto S, Yamamoto M, Tatebe M, Morita A, Kinoshita F, Hirata H. Interleukin‐6 secretion by fibroblasts in carpal tunnel syndrome patients is associated with trigger finger and inhibited by tranilast. Muscle Nerve 2020; 61:408-415. [DOI: 10.1002/mus.26793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 12/21/2019] [Accepted: 12/23/2019] [Indexed: 12/26/2022]
Affiliation(s)
- Hiroya Kawamoto
- Department of OrthopaedicsYokkaichi Municipal Hospital Mie Japan
- Department of Hand SurgeryNagoya University Graduate School of Medicine Nagoya Japan
| | - Katsuyuki Iwatsuki
- Department of Hand SurgeryNagoya University Graduate School of Medicine Nagoya Japan
| | - Shigeru Kurimoto
- Department of Hand SurgeryNagoya University Graduate School of Medicine Nagoya Japan
| | - Michiro Yamamoto
- Department of Hand SurgeryNagoya University Graduate School of Medicine Nagoya Japan
| | - Masahiro Tatebe
- Department of Hand SurgeryNagoya University Graduate School of Medicine Nagoya Japan
| | - Akimasa Morita
- Department of OrthopaedicsSuzuka Kaisei Hospital Mie Japan
| | - Fumie Kinoshita
- Data Coordinating Center, Department of Advanced MedicineNagoya University Hospital Nagoya Japan
| | - Hitoshi Hirata
- Department of Hand SurgeryNagoya University Graduate School of Medicine Nagoya Japan
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21
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Pelletier R, Paquette É, Bourbonnais D, Higgins J, Harris PG, Danino MA. Bilateral sensory and motor as well as cognitive differences between persons with and without musculoskeletal disorders of the wrist and hand. Musculoskelet Sci Pract 2019; 44:102058. [PMID: 31542683 DOI: 10.1016/j.msksp.2019.102058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Revised: 08/11/2019] [Accepted: 09/12/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND Sensory and motor disturbances are characteristic of musculoskeletal injuries and conditions. Rehabilitation interventions aimed at remediating these disturbances are traditionally exclusively targeted to the affected area. However, there is some evidence of bilateral changes in sensory and motor function associated with unilateral injuries and conditions suggesting central changes. Deficits on specific cognitive tasks have also been documented in persons with chronic pain. PURPOSE The purpose of the present study was to determine if participants with unilateral pain arising from heterogeneous wrist/hand injuries and conditions demonstrate bilateral changes in sensory and motor functions as well as cognitive deficits. DESIGN/METHODS Sensory (Pressure Pain Thresholds, Two Point Orientation Discrimination), Motor (grip strength and Purdue Pegboard), and Cognitive function (Stroop test and mental rotation task) were measured in 30 participants with wrist/hand pain and 30 healthy control participants in an observational cross-sectional study. RESULTS Participants with unilateral wrist/hand pain demonstrated differences in cognitive function measured with the Stroop test (p = 0.03). They also demonstrated bilateral sensorimotor differences in pressure pain thresholds (p = 0.03), grip strength (p = 0.00) and Purdue pegboard test (p = 0.03) results compared to healthy control participants. CONCLUSION Cognitive as well as bilateral alterations in sensory and motor function in participants with musculoskeletal injuries and conditions suggest central changes are involved in their pathophysiology. These findings in persons with heterogeneous injuries/conditions suggest that these changes are not specific to an injury/condition. Bilateral sensorimotor changes have important implications with regards to the pathophysiology of musculoskeletal disorders of the wrist/hand, for rehabilitative interventions and research.
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Affiliation(s)
- René Pelletier
- Sciences de la réadaptation, École de réadaptation, Faculté de Médecine, Université de Montréal, Montréal, Québec, H3C 3J7, Canada.
| | - Élyssa Paquette
- Sciences de la réadaptation, École de réadaptation, Faculté de Médecine, Université de Montréal, Montréal, Québec, H3C 3J7, Canada.
| | - Daniel Bourbonnais
- École de réadaptation, Faculté de médecine, Université de Montréal, C.P. 6128, succursale Centre-ville, Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Montréal, H3C 3J7, Québec, Canada.
| | - Johanne Higgins
- École de réadaptation, Faculté de médecine, Université de Montréal, C.P. 6128, succursale Centre-ville, Centre for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Montréal, H3C 3J7, Québec, Canada.
| | - Patrick G Harris
- Département de chirurgie Université de Montréal, Chef département de chirurgie du Centre Hospitalier de l'Université de Montréal (CHUM), 1000, rue Saint-Denisx, H2X 0C1, Québec, Canada.
| | - Michel Alain Danino
- Université de Montréal, Chef du service de chirurgie plastique du Centre Hospitalier Université de Montréal (CHUM), 850, rue St-Denis Pav. S - local S02-128, H2X 0A9, Montréal, Québec, Canada.
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22
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Ramalho BL, Rangel ML, Schmaedeke AC, Erthal FS, Vargas CD. Unilateral Brachial Plexus Lesion Impairs Bilateral Touch Threshold. Front Neurol 2019; 10:872. [PMID: 31456738 PMCID: PMC6700256 DOI: 10.3389/fneur.2019.00872] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 07/26/2019] [Indexed: 12/20/2022] Open
Abstract
Unilateral brachial plexus injury (BPI) impairs sensory and motor functions of the upper limb. This study aimed to map in detail brachial plexus sensory impairment both in the injured and the uninjured upper limb. Touch sensation was measured through Semmes-Weinstein monofilaments at the autonomous regions of the brachial plexus nerves, hereafter called points of exclusive innervation (PEIs). Seventeen BPI patients (31.35 years±6.9 SD) and 14 age-matched healthy controls (27.57 years±5.8 SD) were tested bilaterally at six selected PEIs (axillary, musculocutaneous, median, radial, ulnar, and medial antebrachial cutaneous [MABC]). As expected, the comparison between the control group and the brachial plexus patients' injured limb showed a robust difference for all PEIs (p ≤ 0.001). Moreover, the comparison between the control group and the brachial plexus uninjured limb revealed a difference for the median (p = 0.0074), radial (p = 0.0185), ulnar (p = 0.0404), and MABC (p = 0.0328) PEIs. After splitting the sample into two groups with respect to the dominance of the injured limb, higher threshold values were found for the uninjured side when it occurred in the right dominant limb compared to the control group at the median (p = 0.0456), radial (p = 0.0096), and MABC (p = 0.0078) PEIs. This effect was absent for the left, non-dominant arm. To assess the effect of the severity of sensory deficits observed in the injured limb upon the alterations of the uninjured limb, a K-means clustering algorithm (k = 2) was applied resulting in two groups with less or more severe sensory impairment. The less severely affected patients presented higher thresholds at the median (p = 0.0189), radial (p = 0.0081), ulnar (p = 0.0253), and MABC (p = 0.0187) PEIs in the uninjured limb in comparison with the control group, whereas higher thresholds at the uninjured limb were found only for the median PEI (p = 0.0457) in the more severely affected group. In conclusion, an expressive reduction in touch threshold was found for the injured limb allowing a precise mapping of the impairment caused by the BPI. Crucially, BPI also led to reduced tactile threshold in specific PEIs in the uninjured upper limb. These new findings suggest a superordinate model of representational plasticity occurring bilaterally in the brain after a unilateral peripheral injury.
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Affiliation(s)
- Bia Lima Ramalho
- Laboratory of Neurobiology of Movement, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.,Laboratory of Neuroscience and Rehabilitation, Institute of Neurology Deolindo Couto, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Maria Luíza Rangel
- Laboratory of Neurobiology of Movement, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.,Laboratory of Neuroscience and Rehabilitation, Institute of Neurology Deolindo Couto, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana Carolina Schmaedeke
- Laboratory of Neurobiology of Movement, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.,Laboratory of Neuroscience and Rehabilitation, Institute of Neurology Deolindo Couto, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fátima Smith Erthal
- Laboratory of Neurobiology II, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Claudia D Vargas
- Laboratory of Neurobiology of Movement, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.,Laboratory of Neuroscience and Rehabilitation, Institute of Neurology Deolindo Couto, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Fernández-de-las-Peñas C, Falla D, Palacios-Ceña M, De-la-Llave-Rincón AI, Schneebeli A, Barbero M. Perceived Pain Extent Is Not Associated with Physical, Psychological, or Psychophysical Outcomes in Women with Carpal Tunnel Syndrome. PAIN MEDICINE 2018; 20:1185-1192. [DOI: 10.1093/pm/pny248] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- César Fernández-de-las-Peñas
- Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Universidad Rey Juan Carlos, Alcorcón, Spain
- Cátedra de Investigación y Docencia en Fisioterapia: Terapia Manual y Punción Seca, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain
| | - Deborah Falla
- Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - María Palacios-Ceña
- Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Universidad Rey Juan Carlos, Alcorcón, Spain
- Cátedra de Investigación y Docencia en Fisioterapia: Terapia Manual y Punción Seca, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain
| | - Ana I De-la-Llave-Rincón
- Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Universidad Rey Juan Carlos, Alcorcón, Spain
- Cátedra de Investigación y Docencia en Fisioterapia: Terapia Manual y Punción Seca, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain
| | - Alessandro Schneebeli
- Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland
| | - Marco Barbero
- Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland
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24
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Roh YH, Kim S, Gong HS, Baek GH. Influence of centrally mediated symptoms on functional outcomes after carpal tunnel release. Sci Rep 2018; 8:11134. [PMID: 30042476 PMCID: PMC6057919 DOI: 10.1038/s41598-018-29522-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 07/13/2018] [Indexed: 11/09/2022] Open
Abstract
Patients with carpal tunnel syndrome (CTS) often show bilaterally increased pain sensitivity and widespread symptoms. We evaluated the influence of centrally mediated symptoms on functional outcomes of carpal tunnel release (CTR). A total of 120 patients with surgically treated CTS were enrolled. Centrally mediated symptoms were preoperatively measured by administering a self-reported central sensitization inventory (CSI) questionnaire and peripheral sensitization was measured by assessing patient's pressure pain thresholds (PPT) in the forearm. Boston Carpal Tunnel Questionnaires (BCTQ) were assessed preoperatively and postoperatively at 3 and 12 months. CSI scores slightly correlated with symptom duration and moderately correlated with preoperative BCTQ scores, while PPT slightly correlated with the BCTQ scores. At 3 months, BCTQ symptom and function scores moderately correlated with lower PPTs and higher CSI scores. At 12 months, only severe electrophysiological grade was associated with BCTQ function scores. Multivariable analysis revealed that preoperative PPT, CSI, and female gender were associated with BCTQ scores at 3 months; these factors failed to be associated for 12-month outcomes. Centrally mediated symptoms measured by CSI and peripheral sensitization measured by PPTs correlated with symptom severity and duration. They were associated with poorer functional outcomes after CTR up to 3 months. However, they did not show persistent effects in the long term.
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Affiliation(s)
- Young Hak Roh
- Department of Orthopaedic Surgery, Ewha Womans University Medical Center, Ewha Womans University College of Medicine, 1071 Anyangcheon-ro, Yangcheon-gu, Seoul, 07985, South Korea.
| | - Sangwoo Kim
- Department of Orthopaedic Surgery, Ewha Womans University Medical Center, Ewha Womans University College of Medicine, 1071 Anyangcheon-ro, Yangcheon-gu, Seoul, 07985, South Korea
| | - Hyun Sik Gong
- Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 173 Gumi-ro, Bundang-gu, Sungnam, 13620, Korea
| | - Goo Hyun Baek
- Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
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Fernández-de-Las-Peñas C, Plaza-Manzano G. Carpal tunnel syndrome: just a peripheral neuropathy? Pain Manag 2018; 8:209-216. [PMID: 29869575 DOI: 10.2217/pmt-2017-0063] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Carpal tunnel syndrome (CTS) is considered just a peripheral neuropathy of the upper extremity associated to the compression of the median nerve. There is evidence suggesting the presence of complex sensitization mechanisms in CTS. These processes are manifested by symptoms in extra-median regions and the presence of bilateral sensory and motor impairments. These sensory and motor changes are not associated to electrodiagnostic findings. The presence of sensitization mechanisms suggests that CTS should not be considered just as a peripheral neuropathy. The presence of altered nociceptive gain processing should be considered for therapeutic management of CTS by considering the application of therapeutic interventions that modulate nociceptive barrage into the CNS.
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Affiliation(s)
- César Fernández-de-Las-Peñas
- Department of Physical Therapy, Occupational Therapy, Rehabilitation & Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain.,Cátedra de Investigación y Docencia en Fisioterapia: Terapia Manual y Punción Seca, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain
| | - Gustavo Plaza-Manzano
- Department of Rehabilitation & Physical Medicine, Medical Hydrology, Complutense University of Madrid, Madrid, Spain.,Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, Spain
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Selective cold pain inhibition by targeted block of TRPM8-expressing neurons with quaternary lidocaine derivative QX-314. Commun Biol 2018; 1:53. [PMID: 30271936 PMCID: PMC6123689 DOI: 10.1038/s42003-018-0062-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 05/02/2018] [Indexed: 01/04/2023] Open
Abstract
Treatment of pain with local anesthetics leads to an unfavorable decrease in general sensory acuity due to their indiscriminate block of both pain sensing (nociceptors) and non-pain sensing nerves. However, the cell impermeant lidocaine derivative QX-314 can be selectively targeted to only nociceptors by permeation through ligand-gated cation channels. Here we show that localized injection of QX-314 with agonists for the menthol receptor TRPM8 specifically blocks cold-evoked behaviors in mice, including cold allodynia and hyperalgesia. Remarkably, cooling stimuli also promotes QX-314-mediated inhibition of cold behaviors, and can be used to block cold allodynia, while retaining relatively normal cold sensation. The effects of both agonist and thermally evoked uptake of QX-314 are TRPM8-dependent, results demonstrating an effective approach to treat localized cold pain without altering general somatosensation. Serra Ongun, Angela Sarkisian and David McKemy show that localized co-injection of lidocaine derivative QX-314 and receptor agonists is able to block cold sensitivity in mice in a targeted way, with implications for treating cold pain associated with injury and disease.
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27
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Arendt‐Nielsen L, Morlion B, Perrot S, Dahan A, Dickenson A, Kress H, Wells C, Bouhassira D, Drewes AM. Assessment and manifestation of central sensitisation across different chronic pain conditions. Eur J Pain 2018; 22:216-241. [DOI: 10.1002/ejp.1140] [Citation(s) in RCA: 375] [Impact Index Per Article: 62.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Abstract
AbstractDifferent neuroplastic processes can occur along the nociceptive pathways and may be important in the transition from acute to chronic pain and for diagnosis and development of optimal management strategies. The neuroplastic processes may result in gain (sensitisation) or loss (desensitisation) of function in relation to the incoming nociceptive signals. Such processes play important roles in chronic pain, and although the clinical manifestations differ across condition processes, they share some common mechanistic features. The fundamental understanding and quantitative assessment of particularly some of the central sensitisation mechanisms can be translated from preclinical studies into the clinic. The clinical perspectives are implementation of such novel information into diagnostics, mechanistic phenotyping, prevention, personalised treatment, and drug development. The aims of this paper are to introduce and discuss (1) some common fundamental central pain mechanisms, (2) how they may translate into the clinical signs and symptoms across different chronic pain conditions, (3) how to evaluate gain and loss of function using quantitative pain assessment tools, and (4) the implications for optimising prevention and management of pain. The chronic pain conditions selected for the paper are neuropathic pain in general, musculoskeletal pain (chronic low back pain and osteoarthritic pain in particular), and visceral pain (irritable bowel syndrome in particular). The translational mechanisms addressed are local and widespread sensitisation, central summation, and descending pain modulation.SignificanceCentral sensitisation is an important manifestation involved in many different chronic pain conditions. Central sensitisation can be different to assess and evaluate as the manifestations vary from pain condition to pain condition. Understanding central sensitisation may promote better profiling and diagnosis of pain patients and development of new regimes for mechanism based therapy. Some of the mechanisms underlying central sensitisation can be translated from animals to humans providing new options in development of therapies and profiling drugs under development.
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Affiliation(s)
| | - B. Morlion
- The Leuven Centre for Algology University Hospitals Leuven University of Leuven Belgium
| | - S. Perrot
- INSERM U987 Pain Center Cochin Hospital Paris Descartes University Paris France
| | - A. Dahan
- Department of Anesthesiology Leiden University Medical Center Leiden The Netherlands
| | - A. Dickenson
- Neuroscience Physiology & Pharmacology University College London UK
| | - H.G. Kress
- Department of Special Anaesthesia and Pain Therapy Medizinische Universität/AKH Wien Vienna Austria
| | | | - D. Bouhassira
- INSERM U987 Centre d'Evaluation et de Traitement de la Douleur Hôpital Ambroise Paré Boulogne Billancourt France
| | - A. Mohr Drewes
- Mech‐Sense Department of Gastroenterology and Hepatology Clinical Institute Aalborg University Hospital Aalborg Denmark
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28
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Dec P, Zyluk A. Bilateral carpal tunnel syndrome – A review. Neurol Neurochir Pol 2018; 52:79-83. [DOI: 10.1016/j.pjnns.2017.09.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 09/24/2017] [Accepted: 09/25/2017] [Indexed: 11/29/2022]
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Soon B, Vicenzino B, Schmid AB, Coppieters MW. Facilitatory and inhibitory pain mechanisms are altered in patients with carpal tunnel syndrome. PLoS One 2017; 12:e0183252. [PMID: 28854251 PMCID: PMC5576684 DOI: 10.1371/journal.pone.0183252] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 08/01/2017] [Indexed: 11/19/2022] Open
Abstract
Preliminary evidence from studies using quantitative sensory testing suggests the presence of central mechanisms in patients with carpal tunnel syndrome (CTS) as apparent by widespread hyperalgesia. Hallmarks of central mechanisms after nerve injuries include nociceptive facilitation and reduced endogenous pain inhibition. Methods to study nociceptive facilitation in CTS so far have been limited to quantitative sensory testing and the integrity of endogenous inhibition remains unexamined. The aim of this study was therefore to investigate changes in facilitatory and inhibitory processing in patients with CTS by studying hypersensitivity following experimentally induced pain (facilitatory mechanisms) and the efficacy of conditioned pain modulation (CPM, inhibitory mechanisms). Twenty-five patients with mild to moderate CTS and 25 age and sex matched control participants without CTS were recruited. Increased pain facilitation was evaluated via injection of hypertonic saline into the upper trapezius. Altered pain inhibition through CPM was investigated through cold water immersion of the foot as the conditioning stimulus and pressure pain threshold over the thenar and hypothenar eminence bilaterally as the test stimulus. The results demonstrated that patients with CTS showed a greater duration (p = 0.047), intensity (p = 0.044) and area (p = 0.012) of pain in response to experimentally induced pain in the upper trapezius and impaired CPM compared to the control participants (p = 0.006). Although typically considered to be driven by peripheral mechanisms, these findings indicate that CTS demonstrates characteristics of altered central processing with increased pain facilitation and reduced endogenous pain inhibition.
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Affiliation(s)
- Benjamin Soon
- Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia
- Singapore Institute of Technology, Singapore, Singapore
| | - Bill Vicenzino
- Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia
- Physiotherapy, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia
| | - Annina B. Schmid
- Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
| | - Michel W. Coppieters
- Physiotherapy, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia
- Amsterdam Movement Sciences, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Menzies Health Institute Queensland and School of Allied Health Sciences, Faculty of Health, Griffith University, Gold Coast Campus, Queensland, Australia
- * E-mail:
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30
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Patient-Reported Disability Measures Do Not Correlate with Electrodiagnostic Severity in Carpal Tunnel Syndrome. PLASTIC AND RECONSTRUCTIVE SURGERY-GLOBAL OPEN 2017; 5:e1440. [PMID: 28894661 PMCID: PMC5585434 DOI: 10.1097/gox.0000000000001440] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 06/14/2017] [Indexed: 11/25/2022]
Abstract
Background: Electrophysiologic studies including electromyography and nerve conduction studies play a role in the evaluation of carpal tunnel syndrome (CTS), despite evidence that these studies do not correlate with CTS-specific symptom scores. There is a lack of evidence comparing electrophysiologic data with general measures of function. Methods: Fifty patients presenting for CTS treatment over an 8-month period were analyzed retrospectively. All patients completed surveys including the Quick Disabilities of the Arm, Shoulder, and Hand questionnaire (DASH) and the Medical Outcomes Study 12-Item Short-Form Survey [(physical component summary 12, mental component summary (MCS-12)]. Electromyography and nerve conduction studies were performed on all patients and compared with outcome scores. Results: Analysis demonstrated no relationship between DASH or MCS-12 and electrodiagnostic severity. No significant correlations were noted between DASH or MCS-12 and median motor or sensory latency. There was a moderate–weak correlation (rho = 0.34) between more severe electrophysiologic grade and better function based on physical component summary 12. Conclusions: Electrodiagnostic severity grades do not correlate with patient-reported disability, including the DASH and MCS–12 surveys. There is a counterintuitive correlation between more-severe electrodiagnostic findings and decreased physical disability. These findings indicate that disability may not correlate with electrodiagnostic severity of median neuropathy in CTS.
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31
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Clarke C, Christensen C, Curran MW, Chan KM. Assessment of small sensory fiber function across the spectrum of severity in carpal tunnel syndrome patients. Muscle Nerve 2017; 56:814-816. [DOI: 10.1002/mus.25592] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/21/2017] [Indexed: 02/05/2023]
Affiliation(s)
- Christopher Clarke
- Division of Physical Medicine and RehabilitationFaculty of Medicine and Dentistry, University of AlbertaEdmonton Alberta
| | - Christopher Christensen
- Division of Physical Medicine and RehabilitationFaculty of Medicine and Dentistry, University of AlbertaEdmonton Alberta
| | - Matthew W.T. Curran
- Division of Plastic SurgeryFaculty of Medicine and Dentistry, University of AlbertaEdmonton Alberta
| | - K. Ming Chan
- Division of Physical Medicine and RehabilitationFaculty of Medicine and Dentistry, University of AlbertaEdmonton Alberta
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32
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Courtney CA, Fernández-de-Las-Peñas C, Bond S. Mechanisms of chronic pain - key considerations for appropriate physical therapy management. J Man Manip Ther 2017; 25:118-127. [PMID: 28694674 DOI: 10.1080/10669817.2017.1300397] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In last decades, knowledge of nociceptive pain mechanisms has expanded rapidly. The use of quantitative sensory testing has provided evidence that peripheral and central sensitization mechanisms play a relevant role in localized and widespread chronic pain syndromes. In fact, almost any patient suffering with a chronic pain condition will demonstrate impairments in the central nervous system. In addition, it is accepted that pain is associated with different types of trigger factors including social, physiological, and psychological. This rational has provoked a change in the understanding of potential mechanisms of manual therapies, changing from a biomechanical/medical viewpoint, to a neurophysiological/nociceptive viewpoint. Therefore, interventions for patients with chronic pain should be applied based on current knowledge of nociceptive mechanisms since determining potential drivers of the sensitization process is critical for effective management. The current paper reviews mechanisms of chronic pain from a clinical and neurophysiological point of view and summarizes key messages for clinicians for proper management of individuals with chronic pain.
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Affiliation(s)
- Carol A Courtney
- Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL, USA
| | - César Fernández-de-Las-Peñas
- Department of Physiotherapy, Universidad Rey Juan Carlos, Alcorcon, Spain.,Center for Sensory-Motor Interaction (SMI), Aalborg University, Aalborg, Denmark
| | - Samantha Bond
- Department of Physical Therapy, University of Illinois at Chicago, Chicago, IL, USA
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33
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Fernández-de-Las-Peñas C, Cleland J, Palacios-Ceña M, Fuensalida-Novo S, Alonso-Blanco C, Pareja JA, Alburquerque-Sendín F. Effectiveness of manual therapy versus surgery in pain processing due to carpal tunnel syndrome: A randomized clinical trial. Eur J Pain 2017; 21:1266-1276. [PMID: 28295825 DOI: 10.1002/ejp.1026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2017] [Indexed: 01/13/2023]
Abstract
BACKGROUND People with carpal tunnel syndrome (CTS) exhibit widespread pressure pain and thermal pain hypersensitivity as a manifestation of central sensitization. The aim of our study was to compare the effectiveness of manual therapy versus surgery for improving pain and nociceptive gain processing in people with CTS. METHODS The trial was conducted at a local regional Hospital in Madrid, Spain from August 2014 to February 2015. In this randomized parallel-group, blinded, clinical trial, 100 women with CTS were randomly allocated to either manual therapy (n = 50), who received three sessions (once/week) of manual therapies including desensitization manoeuvres of the central nervous system, or surgical intervention (n = 50) group. Outcomes including pressure pain thresholds (PPT), thermal pain thresholds (HPT or CPT), and pain intensity which were assessed at baseline, and 3, 6, 9 and 12 months after the intervention by an assessor unaware of group assignment. Analysis was by intention to treat with mixed ANCOVAs adjusted for baseline scores. RESULTS At 12 months, 95 women completed the follow-up. Patients receiving manual therapy exhibited higher increases in PPT over the carpal tunnel at 3, 6 and 9 months (all, p < 0.01) and higher decrease of pain intensity at 3 month follow-up (p < 0.001) than those receiving surgery. No significant differences were observed between groups for the remaining outcomes. CONCLUSIONS Manual therapy and surgery have similar effects on decreasing widespread pressure pain sensitivity and pain intensity in women with CTS. Neither manual therapy nor surgery resulted in changes in thermal pain sensitivity. SIGNIFICANCE The current study found that manual therapy and surgery exhibited similar effects on decreasing widespread pressure pain sensitivity and pain intensity in women with carpal tunnel syndrome at medium- and long-term follow-ups investigating changes in nociceptive gain processing after treatment in carpal tunnel syndrome.
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Affiliation(s)
- C Fernández-de-Las-Peñas
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | - J Cleland
- Department of Physical Therapy, Franklin Pierce University, Manchester, USA.,Rehabilitation Services, Concord Hospital, USA.,Manual Therapy Fellowship Program, Regis University, Denver, USA
| | - M Palacios-Ceña
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | - S Fuensalida-Novo
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | - C Alonso-Blanco
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Spain
| | - J A Pareja
- Department of Neurology and Neurophysiology, Hospital Universitario Fundación Alcorcón, Madrid, Spain
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Hüllemann P, von der Brelie C, Manthey G, Düsterhöft J, Helmers A, Synowitz M, Baron R. Reduced laser-evoked potential habituation detects abnormal central pain processing in painful radiculopathy patients. Eur J Pain 2017; 21:918-926. [DOI: 10.1002/ejp.994] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/18/2016] [Indexed: 11/06/2022]
Affiliation(s)
- P. Hüllemann
- Division of Neurological Pain Research and Therapy; Department of Neurology; University Hospital Schleswig-Holstein Campus Kiel; Kiel Germany
| | - C. von der Brelie
- Department of Neurosurgery; University Hospital Schleswig-Holstein Campus Kiel; Kiel Germany
| | - G. Manthey
- Division of Neurological Pain Research and Therapy; Department of Neurology; University Hospital Schleswig-Holstein Campus Kiel; Kiel Germany
| | - J. Düsterhöft
- Division of Neurological Pain Research and Therapy; Department of Neurology; University Hospital Schleswig-Holstein Campus Kiel; Kiel Germany
| | - A.K. Helmers
- Department of Neurosurgery; University Hospital Schleswig-Holstein Campus Kiel; Kiel Germany
| | - M. Synowitz
- Department of Neurosurgery; University Hospital Schleswig-Holstein Campus Kiel; Kiel Germany
| | - R. Baron
- Division of Neurological Pain Research and Therapy; Department of Neurology; University Hospital Schleswig-Holstein Campus Kiel; Kiel Germany
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35
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Cellular permeation of large molecules mediated by TRPM8 channels. Neurosci Lett 2016; 639:59-67. [PMID: 28038937 DOI: 10.1016/j.neulet.2016.12.063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 12/23/2016] [Accepted: 12/24/2016] [Indexed: 11/24/2022]
Abstract
While most membrane channels are only capable of passing small ions, certain non-selective cation channels have been recently shown to have the capacity to permeate large cations. The mechanisms underlying large molecule permeation are unclear, but this property has been exploited pharmacologically to target molecules, such as nerve conduction blockers, to specific subsets of pain-sensing neurons (nociceptors) expressing the heat-gated transient receptor potential (TRP) channel TRPV1. However, it is not clear if the principal mediator of cold stimuli TRPM8 is capable of mediating the permeation large molecules across cell membranes, suggesting that TRPM8-positive nerves cannot be similarly targeted. Here we show that both heterologous cells and native sensory neurons expressing TRPM8 channels allow the permeation of the large fluorescent cation Po-Pro3. Po-Pro3 influx is blocked by TRPM8-specific antagonism and when channel activity is desensitized. The effects of the potent agonist WS-12 are TRPM8-specific and dye uptake mediated by TRPM8 channels is similar to that observed with TRPV1. Lastly, we find that as with TRPV1, activation of TRPM8 channels can be used as a means to target intracellular uptake of cell-impermeable sodium channel blockers. In a neuronal cell line expressing TRPM8 channels, voltage-gated sodium currents are blocked in the presence of the cell-impermeable, charged lidocaine derivative QX-314 and WS-12. These results show that the ability of somatosensory TRP channels to promote the permeation of large cations also includes TRPM8, thereby suggesting that novel approaches to alter cold pain can also be employed via conduction block in TRPM8-positive sensory neurons.
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Drinovac Vlah V, Bach-Rojecky L, Lacković Z. Antinociceptive action of botulinum toxin type A in carrageenan-induced mirror pain. J Neural Transm (Vienna) 2016; 123:1403-1413. [DOI: 10.1007/s00702-016-1605-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 08/02/2016] [Indexed: 12/28/2022]
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Baselgia LT, Bennett DL, Silbiger RM, Schmid AB. Negative Neurodynamic Tests Do Not Exclude Neural Dysfunction in Patients With Entrapment Neuropathies. Arch Phys Med Rehabil 2016; 98:480-486. [PMID: 27449322 PMCID: PMC5324720 DOI: 10.1016/j.apmr.2016.06.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 06/22/2016] [Accepted: 06/26/2016] [Indexed: 12/13/2022]
Abstract
Objective To examine differences in somatosensory phenotypes of patients with positive and negative neurodynamic tests and compare these with healthy participants. Design Case-control study. Setting University department. Participants Patients with electrodiagnostically confirmed carpal tunnel syndrome (CTS) (n=53) and people without CTS (n=26) participated in this study (N=79). Patients with CTS were subgrouped according to the results of the upper limb neurodynamic tests biasing the median nerve into patients with positive or negative neurodynamic tests. Interventions Not applicable. Main Outcome Measure All participants underwent quantitative sensory testing in the median innervated territory of their hand. Results Only 46% of patients with CTS had positive neurodynamic tests. No differences were identified between groups for pain thresholds (P>.247). However, patients with CTS had increased mechanical (P<.0001) and thermal detection thresholds (P<.0001) compared with people without CTS. Patients with negative neurodynamic tests had a more pronounced vibration detection deficit (mean, 7.43±0.59) than people without CTS (mean, 7.89±0.22; P=.001). Interestingly, warm detection was the only domain differentiating positive (mean, 4.03°C±2.18°C) and negative neurodynamic test groups (6.09°C±3.70°C, P=.032), with patients with negative neurodynamic tests demonstrating increased loss of function. Conclusions Patients with negative neurodynamic tests seem to have a more severe dysfunction of the unmyelinated fiber population. Our findings suggest that neurodynamic tests should not be used in isolation to judge neural involvement. Rather, they should be interpreted in the context of loss of function tests of the small fiber domain.
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Affiliation(s)
- Larissa T Baselgia
- Institute of Physiotherapy, Zurich University of Applied Sciences ZHAW, Winterthur, Switzerland
| | - David L Bennett
- Nuffield Department of Clinical Neurosciences, University of Oxford, Headington, UK
| | | | - Annina B Schmid
- Nuffield Department of Clinical Neurosciences, University of Oxford, Headington, UK; School of Health and Rehabilitation Sciences, The University of Queensland, St Lucia, QLD, Australia.
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Fernández-de-Las-Peñas C, Fernández-Muñoz JJ, Navarro-Pardo E, da-Silva-Pocinho RF, Ambite-Quesada S, Pareja JA. Identification of Subgroups of Women with Carpal Tunnel Syndrome with Central Sensitization. PAIN MEDICINE 2016; 17:1749-56. [PMID: 27064104 DOI: 10.1093/pm/pnw054] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Identification of subjects with different sensitization mechanisms can help to identify better therapeutic strategies for carpal tunnel syndrome (CTS). The aim of the current study was to identify subgroups of women with CTS with different levels of sensitization. METHODS A total of 223 women with CTS were recruited. Self-reported variables included pain intensity, function, disability, and depression. Pressure pain thresholds (PPT) were assessed bilaterally over median, ulnar, and radial nerves, C5-C6 joint, carpal tunnel, and tibialis anterior to assess widespread pressure pain hyperalgesia. Heat (HPT) and cold (CPT) pain thresholds were also bilaterally assessed over the carpal tunnel and the thenar eminence to determine thermal pain hyperalgesia. Pinch grip force between the thumb and the remaining fingers was calculated to determine motor assessment. Subgroups were determined according to the status on a previous clinical prediction rule: PPT over the affected C5-C6 joint < 137 kPa, HPT on affected carpal tunnel <39.6ºC, and general health >66 points. RESULTS The ANOVA showed that women within group 1 (positive rule, n = 60) exhibited bilateral widespread pressure hyperalgesia (P < 0.001) and bilateral thermal thresholds (P < 0.001) than those within group 2 (negative rule, n = 162). Women in group 1 also exhibited higher depression than those in group 2 (P = 0.023). No differences in self-reported variables were observed. CONCLUSION This study showed that a clinical prediction rule originally developed for identifying women with CTS who are likely to respond favorably to manual physical therapy was able to identify women exhibiting higher widespread pressure hyper-sensitivity and thermal hyperalgesia. This subgroup of women with CTS exhibiting higher sensitization may need specific therapeutic programs.
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Affiliation(s)
- César Fernández-de-Las-Peñas
- *Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Universidad Rey Juan Carlos, Alcorcón, Spain Grupo Excelencia Investigadora URJC-Banco Santander referencia Nº30VCPIGI03: Investigación traslacional en el proceso de salud - enfermedad (ITPSE), Universidad Rey Juan Carlos, Alcorcón, Spain
| | | | | | | | - Silvia Ambite-Quesada
- *Department of Physical Therapy, Occupational Therapy, Physical Medicine and Rehabilitation, Universidad Rey Juan Carlos, Alcorcón, Spain Grupo Excelencia Investigadora URJC-Banco Santander referencia Nº30VCPIGI03: Investigación traslacional en el proceso de salud - enfermedad (ITPSE), Universidad Rey Juan Carlos, Alcorcón, Spain
| | - Juan A Pareja
- Department of Neurology and Neurophysiology, Fundación Hospital Alcorcón, Alcorcón, Spain
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Pain is Associated to Clinical, Psychological, Physical, and Neurophysiological Variables in Women With Carpal Tunnel Syndrome. Clin J Pain 2016; 32:122-9. [DOI: 10.1097/ajp.0000000000000241] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Evidence of Nervous System Sensitization in Commonly Presenting and Persistent Painful Tendinopathies: A Systematic Review. J Orthop Sports Phys Ther 2015; 45:864-75. [PMID: 26390275 DOI: 10.2519/jospt.2015.5895] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Study Design Systematic review. Objectives To elucidate if there is sensitization of the nervous system in those with persistent rotator cuff (shoulder), lateral elbow, patellar, and Achilles tendinopathies. Background Tendinopathy can be difficult to treat, and persistent intractable pain and dysfunction are frequent. It is hypothesized that induction or maintenance of persistent pain in tendinopathy may be, at least in part, based on changes in the nervous system. Methods The PRISMA guidelines were followed. Relevant articles were identified through a computerized search in Embase, PubMed, and Web of Science, followed by a manual search of reference lists of retained articles. To be eligible, studies had to include quantitative sensory testing and evaluate individuals diagnosed with a persistent tendinopathy of the rotator cuff (shoulder), lateral elbow, patella, or Achilles tendon. Methodological quality assessment was evaluated with the Newcastle-Ottawa Scale. Results In total, 16 full-text articles met the criteria for inclusion, of which the majority were case-control studies with heterogeneous methodological quality. No studies on Achilles tendinopathy were found. Mechanical algometry was the predominant quantitative sensory testing used. Lowered pressure pain threshold was observed across different tendinopathies at the site of tendinopathy, as well as at other sites, the latter being suggestive of central sensitization. Conclusion Although more research on sensory abnormalities is warranted, it appears likely that there is an association between persistent tendon pain and sensitization of the nervous system. This evidence is primarily from studies of upper-limb tendinopathy, and caution should be exercised with inference to lower-limb tendinopathy. J Orthop Sports Phys Ther 2015;45(11):864-875. Epub 21 Sep 2015. doi:10.2519/jospt.2015.5895.
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Laymon M, Petrofsky J, McKivigan J, Lee H, Yim J. Effect of heat, cold, and pressure on the transverse carpal ligament and median nerve: a pilot study. Med Sci Monit 2015; 21:446-51. [PMID: 25669437 PMCID: PMC4335578 DOI: 10.12659/msm.892462] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Background This study quantified the effects of heat, cold, and pressure on the median nerve and transverse carpal ligament in subjects without carpal tunnel syndrome. Material/Methods Subjects were individuals ages 20–50 who had no symptoms of carpal tunnel disease. Imaging ultrasound was used to measure the clearance around the median nerve, transverse ligament elasticity, nerve conduction velocity, thickness of the carpal ligament, and area of the median nerve. Pressure was applied to the carpal ligament to assess the effects of increasing pressure on these structures. On 3 separate days, 10 subjects had ThermaCare heat or cold packs applied, for either 60 or 120 minutes for heat or 20 minutes for cold, to the palmer surface of the hand. Results Tissue changes were recorded as a response to pressure applied at 0, 5, 10, and 20 N. The size of the nerve and ligaments were not significantly altered by pressure with the hand at room temperature and after cold exposure. After heat, the nerve, ligaments, and tendons showed significantly more elasticity. Conclusions Application of cold to the hand may reduce compression of the carpal ligament and nerve.
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Affiliation(s)
- Michael Laymon
- School of Physical Therapy, Touro University Nevada, Henderson, NV, USA
| | - Jerrold Petrofsky
- Department of Physical Therapy, School of Allied Health Professions, Loma Linda University, Loma Linda, CA, USA
| | - James McKivigan
- School of Physical Therapy, Touro University Nevada, Henderson, NV, USA
| | - Haneul Lee
- Department of Physical Therapy, School of Allied Health Professions, Loma Linda University, Loma Linda, CA, USA
| | - JongEun Yim
- Department of Physical Therapy, Sahmyook University, Seoul, Korea
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Schmid AB, Bland JDP, Bhat MA, Bennett DLH. The relationship of nerve fibre pathology to sensory function in entrapment neuropathy. ACTA ACUST UNITED AC 2014; 137:3186-99. [PMID: 25348629 PMCID: PMC4240296 DOI: 10.1093/brain/awu288] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The impact of peripheral entrapment neuropathies on target innervation remains unknown. Using quantitative sensory testing, neurophysiology and skin biopsies, Schmid et al. demonstrate that carpal tunnel syndrome affects large fibres and their nodal complexes, but is also associated with a reduction in the number and functioning of small sensory axons. Surprisingly little is known about the impact of entrapment neuropathy on target innervation and the relationship of nerve fibre pathology to sensory symptoms and signs. Carpal tunnel syndrome is the most common entrapment neuropathy; the aim of this study was to investigate its effect on the morphology of small unmyelinated as well as myelinated sensory axons and relate such changes to somatosensory function and clinical symptoms. Thirty patients with a clinical and electrophysiological diagnosis of carpal tunnel syndrome [17 females, mean age (standard deviation) 56.4 (15.3)] and 26 age and gender matched healthy volunteers [18 females, mean age (standard deviation) 51.0 (17.3)] participated in the study. Small and large fibre function was examined with quantitative sensory testing in the median nerve territory of the hand. Vibration and mechanical detection thresholds were significantly elevated in patients with carpal tunnel syndrome (P < 0.007) confirming large fibre dysfunction and patients also presented with increased thermal detection thresholds (P < 0.0001) indicative of C and Aδ-fibre dysfunction. Mechanical and thermal pain thresholds were comparable between groups (P > 0.13). A skin biopsy was taken from a median nerve innervated area of the proximal phalanx of the index finger. Immunohistochemical staining for protein gene product 9.5 and myelin basic protein was used to evaluate morphological features of unmyelinated and myelinated axons. Evaluation of intraepidermal nerve fibre density showed a striking loss in patients (P < 0.0001) confirming a significant compromise of small fibres. The extent of Meissner corpuscles and dermal nerve bundles were comparable between groups (P > 0.07). However, patients displayed a significant increase in the percentage of elongated nodes (P < 0.0001), with altered architecture of voltage-gated sodium channel distribution. Whereas neither neurophysiology nor quantitative sensory testing correlated with patients’ symptoms or function deficits, the presence of elongated nodes was inversely correlated with a number of functional and symptom related scores (P < 0.023). Our findings suggest that carpal tunnel syndrome does not exclusively affect large fibres but is associated with loss of function in modalities mediated by both unmyelinated and myelinated sensory axons. We also document for the first time that entrapment neuropathies lead to a clear reduction in intraepidermal nerve fibre density, which was independent of electrodiagnostic test severity. The presence of elongated nodes in the target tissue further suggests that entrapment neuropathies affect nodal structure/myelin well beyond the focal compression site. Interestingly, nodal lengthening may be an adaptive phenomenon as it inversely correlates with symptom severity.
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Affiliation(s)
- Annina B Schmid
- Nuffield Department of Clinical Neurosciences, University of Oxford, OX3 9DU, Headington, UK School of Health and Rehabilitation Sciences, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Jeremy D P Bland
- Department of Clinical Neurophysiology, Kent and Canterbury Hospital, CT1 3NG, Canterbury Kent, UK
| | - Manzoor A Bhat
- Department of Physiology, Centre for Biomedical Neuroscience, School of Medicine, University of Texas Health Science Centre, San Antonio, TX, USA
| | - David L H Bennett
- Nuffield Department of Clinical Neurosciences, University of Oxford, OX3 9DU, Headington, UK
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Coronado RA, Simon CB, Valencia C, George SZ. Experimental pain responses support peripheral and central sensitization in patients with unilateral shoulder pain. Clin J Pain 2014; 30:143-51. [PMID: 23619203 DOI: 10.1097/ajp.0b013e318287a2a4] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE The aims of this study were to (1) examine the pattern of experimental pain responses in the affected and nonaffected extremities in patients with shoulder pain and (2) explore the intraindividual association between sensitization states derived from experimental pain testing. METHODS Experimental pain responses from 58 patients with shoulder pain (17 women, aged 18 to 52 y) were compared with those from 56 age-matched and sex-matched pain-free volunteers (16 women, aged 21 to 58 y). Experimental pain responses included pressure pain threshold (PPT), thermal pain threshold and tolerance, and suprathreshold heat pain response. Comparisons were made between the affected and nonaffected extremities of clinical participants and the average response of extremities in control participants. Peripheral and central sensitization indexes were computed for clinical participants using standardized scores and percentile cutoffs on the basis of the data from the control sample. Experimental pain responses in clinical participants observed beyond the 25th and 75th percentile of control sample responses were used for investigation of intraindividual association of sensitization states. RESULTS PPT at the acromion and masseter on the affected side of clinical participants were diminished compared with that on their nonaffected side (P<0.015). Bilateral sensitivity in clinical participants was noted for PPT at the acromion and suprathreshold heat pain response (P<0.015). Peripheral and central sensitization indexes demonstrated that individuals with shoulder pain present with variable patterns of peripheral and central sensitization. CONCLUSIONS Collectively, experimental pain responses supported peripheral and central sensitization in response to pressure and thermal stimuli. No clear association was made between individuals exhibiting peripheral or central sensitization, thus suggesting heterogeneity in pain processing in this clinical population.
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Affiliation(s)
- Rogelio A Coronado
- *Department of Physical Therapy, College of Public Health and Health Professions ‡Center for Pain Research and Behavioral Health, University of Florida, FL †Department of Applied Medicine and Rehabilitation, Indiana State University, IN
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Stokes JA, Cheung J, Eddinger K, Corr M, Yaksh TL. Toll-like receptor signaling adapter proteins govern spread of neuropathic pain and recovery following nerve injury in male mice. J Neuroinflammation 2013; 10:148. [PMID: 24321498 PMCID: PMC3896749 DOI: 10.1186/1742-2094-10-148] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Accepted: 11/18/2013] [Indexed: 02/06/2023] Open
Abstract
Background Spinal Toll-like receptors (TLRs) and signaling intermediaries have been implicated in persistent pain states. We examined the roles of two major TLR signaling pathways and selected TLRs in a mononeuropathic allodynia. Methods L5 spinal nerve ligation (SNL) was performed in wild type (WT, C57BL/6) male and female mice and in male Tlr2-/-Tlr3-/-, Tlr4-/-, Tlr5-/-, Myd88-/-, Triflps2, Myd88/Triflps2, Tnf-/-, and Ifnar1-/- mice. We also examined L5 ligation in Tlr4-/- female mice. We examined tactile allodynia using von Frey hairs. Iba-1 (microglia) and GFAP (astrocytes) were assessed in spinal cords by immunostaining. Tactile thresholds were analyzed by 1- and 2-way ANOVA and the Bonferroni post hoc test was used. Results In WT male and female mice, SNL lesions resulted in a persistent and robust ipsilateral, tactile allodynia. In males with TLR2, 3, 4, or 5 deficiencies, tactile allodynia was significantly, but incompletely, reversed (approximately 50%) as compared to WT. This effect was not seen in female Tlr4-/- mice. Increases in ipsilateral lumbar Iba-1 and GFAP were seen in mutant and WT mice. Mice deficient in MyD88, or MyD88 and TRIF, showed an approximately 50% reduction in withdrawal thresholds and reduced ipsilateral Iba-1. In contrast, TRIF and interferon receptor null mice developed a profound ipsilateral and contralateral tactile allodynia. In lumbar sections of the spinal cords, we observed a greater increase in Iba-1 immunoreactivity in the TRIF-signaling deficient mice as compared to WT, but no significant increase in GFAP. Removing MyD88 abrogated the contralateral allodynia in the TRIF signaling-deficient mice. Conversely, IFNβ, released downstream to TRIF signaling, administered intrathecally, temporarily reversed the tactile allodynia. Conclusions These observations suggest a critical role for the MyD88 pathway in initiating neuropathic pain, but a distinct role for the TRIF pathway and interferon in regulating neuropathic pain phenotypes in male mice.
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Affiliation(s)
| | | | | | | | - Tony L Yaksh
- Department of Pharmacology, University of California, 9500 Gilman Dr, MC 0636, La Jolla, San Diego, CA 92093-0636, USA.
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Local and remote immune-mediated inflammation after mild peripheral nerve compression in rats. J Neuropathol Exp Neurol 2013; 72:662-80. [PMID: 23771220 DOI: 10.1097/nen.0b013e318298de5b] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
After experimental nerve injuries that extensively disrupt axons, such as chronic constriction injury, immune cells invade the nerve, related dorsal root ganglia (DRGs), and spinal cord, leading to hyperexcitability, raised sensitivity, and pain. Entrapment neuropathies, such as carpal tunnel syndrome, involve minimal axon damage, but patients often report widespread symptoms. To understand the underlying pathology, a tube was placed around the sciatic nerve in 8-week-old rats, leading to progressive mild compression as the animals grew. Immunofluorescence was used to examine myelin and axonal integrity, glia, macrophages, and T lymphocytes in the nerve, L5 DRGs, and spinal cord after 12 weeks. Tubes that did not constrict the nerve when applied caused extensive and ongoing loss of myelin, together with compromise of small-, but not large-, diameter axons. Macrophages and T lymphocytes infiltrated the nerve and DRGs. Activated glia proliferated in DRGs but not in spinal cord. Histologic findings were supported by clinical hyperalgesia to blunt pressure and cold allodynia. Tubes that did not compress the nerve induced only minor local inflammation. Thus, progressive mild nerve compression resulted in chronic local and remote immune-mediated inflammation depending on the degree of compression. Such neuroinflammation may explain the widespread symptoms in patients with entrapment neuropathies.
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Gürsoy AE, Kolukısa M, Yıldız GB, Kocaman G, Celebi A, Koçer A. Relationship between electrodiagnostic severity and neuropathic pain assessed by the LANSS pain scale in carpal tunnel syndrome. Neuropsychiatr Dis Treat 2013; 9:65-71. [PMID: 23326196 PMCID: PMC3544346 DOI: 10.2147/ndt.s38513] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE The aim of the study was to investigate the relationship between the presence of neuropathic pain assessed by the Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) scale and electrophysiological findings in patients with carpal tunnel syndrome (CTS). METHODS We studied 124 hands with idiopathic CTS with pain complaints involving hand and wrist. All hands were assessed by the LANSS with which a score of 12 or more is defined as pain dominated by neuropathic mechanisms. These hands were assigned to minimal, mild, moderate, severe, or extreme severe groups according to the results of the median nerve conduction studies. RESULTS A LANSS score ≥ 12, suggestive of pain dominated by neuropathic mechanisms, was defined in 59 (47.6%) CTS hands. Pain intensity was significantly higher in CTS hands with a LANSS score ≥ 12 (P < 0.001). Among electrophysiological findings, compound muscle action potential amplitude was significantly lower in hands with a LANSS score ≥ 12 compared with hands with a LANSS score < 12 (P = 0.020). Severity of CTS was not significantly different between LANSS ≥ 12 and LANSS < 12 groups. Electrophysiological severity was significantly higher in CTS hands with evoked pain (P = 0.005) and allodynia (P < 0.001) in LANSS subscore analysis. CONCLUSION We suggest that the presence of pain dominated by neuropathic mechanisms in CTS is not related to electrophysiological CTS severity. Neuropathic pain should be assessed carefully in patients with CTS, and an appropriate treatment plan should be chosen, taking into account the clinical and electrophysiological findings together with the true pain classification.
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Affiliation(s)
- Azize Esra Gürsoy
- Department of Neurology, Bezmialem Vakıf University, Istanbul, Turkey
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Isabel de-la-Llave-Rincón A, Puentedura EJ, Fernández-de-Las-Peñas C. Clinical presentation and manual therapy for upper quadrant musculoskeletal conditions. J Man Manip Ther 2012; 19:201-11. [PMID: 23115473 DOI: 10.1179/106698111x13129729551985] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
In recent years, increased knowledge of the pathogenesis of upper quadrant pain syndromes has translated to better management strategies. Recent studies have demonstrated evidence of peripheral and central sensitization mechanisms in different local pain syndromes of the upper quadrant such as idiopathic neck pain, lateral epicondylalgia, whiplash-associated disorders, shoulder impingement, and carpal tunnel syndrome. Therefore, a treatment-based classification approach where subjects receive matched interventions has been developed and, it has been found that these patients experience better outcomes than those receiving non-matched interventions. There is evidence suggesting that the cervical and thoracic spine is involved in upper quadrant pain. Spinal manipulation has been found to be effective for patients with elbow pain, neck pain, or cervicobrachial pain. Additionally, it is known that spinal manipulative therapy exerts neurophysiological effects that can activate pain modulation mechanisms. This paper exposes some manual therapies for upper quadrant pain syndromes, based on a nociceptive pain rationale for modulating central nervous system including trigger point therapy, dry needling, mobilization or manipulation, and cognitive pain approaches.
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Affiliation(s)
- Ana Isabel de-la-Llave-Rincón
- Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain ; Esthesiology Laboratory of Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain
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Konopka KH, Harbers M, Houghton A, Kortekaas R, van Vliet A, Timmerman W, den Boer JA, Struys MMRF, van Wijhe M. Bilateral sensory abnormalities in patients with unilateral neuropathic pain; a quantitative sensory testing (QST) study. PLoS One 2012; 7:e37524. [PMID: 22629414 PMCID: PMC3358252 DOI: 10.1371/journal.pone.0037524] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 04/20/2012] [Indexed: 12/27/2022] Open
Abstract
In patients who experience unilateral chronic pain, abnormal sensory perception at the non-painful side has been reported. Contralateral sensory changes in these patients have been given little attention, possibly because they are regarded as clinically irrelevant. Still, bilateral sensory changes in these patients could become clinically relevant if they challenge the correct identification of their sensory dysfunction in terms of hyperalgesia and allodynia. Therefore, we have used the standardized quantitative sensory testing (QST) protocol of the German Research Network on Neuropathic Pain (DFNS) to investigate somatosensory function at the painful side and the corresponding non-painful side in unilateral neuropathic pain patients using gender- and age-matched healthy volunteers as a reference cohort. Sensory abnormalities were observed across all QST parameters at the painful side, but also, to a lesser extent, at the contralateral, non-painful side. Similar relative distributions regarding sensory loss/gain for non-nociceptive and nociceptive stimuli were found for both sides. Once a sensory abnormality for a QST parameter at the affected side was observed, the prevalence of an abnormality for the same parameter at the non-affected side was as high as 57% (for Pressure Pain Threshold). Our results show that bilateral sensory dysfunction in patients with unilateral neuropathic pain is more rule than exception. Therefore, this phenomenon should be taken into account for appropriate diagnostic evaluation in clinical practice. This is particularly true for mechanical stimuli where the 95% Confidence Interval for the prevalence of sensory abnormalities at the non-painful side ranges between 33% and 50%.
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Affiliation(s)
- Karl-Heinz Konopka
- Pain Management Unit, Department of Anesthesiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
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Tratamiento fisioterápico basado en la neuromodulación de la sensibilización central en el síndrome del túnel del carpo: a propósito del un caso. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.ft.2012.01.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Increased pain sensitivity is not associated with electrodiagnostic findings in women with carpal tunnel syndrome. Clin J Pain 2012; 27:747-54. [PMID: 21562410 DOI: 10.1097/ajp.0b013e31821c29d3] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE To determine the differences in widespread pressure pain and thermal hypersensitivity in women with minimal, moderate, and severe carpal tunnel syndrome (CTS) and healthy controls. METHODS A total of 72 women with CTS (19 with minimal, 18 with moderate, and 35 with severe) and 19 healthy age-matched women participated. Pressure pain thresholds were bilaterally assessed over the median, ulnar, and radial nerves, the C5 to C6 zygapophyseal joint, the carpal tunnel, and the tibialis anterior muscle. In addition, warm and cold detection thresholds and heat and cold pain thresholds were bilaterally assessed over the carpal tunnel and the thenar eminence. All outcome parameters were assessed by an assessor blinded to the participant's condition. RESULTS No significant differences in pain parameters among patients with minimal, moderate, and severe CTS were found. The results showed that PPT were significantly decreased bilaterally over the median, ulnar, and radial nerve trunks, the carpal tunnel, C5 to C6 zygapophyseal joint, and the tibialis anterior muscle in patients with minimal, moderate, or severe CTS as compared with healthy controls (all, P<0.001). In addition, patients with CTS also showed lower heat pain threshold and reduced cold pain threshold compared with controls (P<0.001). No significant sensory differences between minimal, moderate, or severe CTS were found. CONCLUSIONS The similar widespread pressure and thermal hypersensitivity in patients with minimal, moderate, or severe CTS and pain intensity suggests that increased pain sensitivity is not related to electrodiagnostic findings.
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