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Snow NJ, Murphy HM, Chaves AR, Moore CS, Ploughman M. Transcranial magnetic stimulation enhances the specificity of multiple sclerosis diagnostic criteria: a critical narrative review. PeerJ 2024; 12:e17155. [PMID: 38563011 PMCID: PMC10984191 DOI: 10.7717/peerj.17155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 03/04/2024] [Indexed: 04/04/2024] Open
Abstract
Background Multiple sclerosis (MS) is an immune-mediated neurodegenerative disease that involves attacks of inflammatory demyelination and axonal damage, with variable but continuous disability accumulation. Transcranial magnetic stimulation (TMS) is a noninvasive method to characterize conduction loss and axonal damage in the corticospinal tract. TMS as a technique provides indices of corticospinal tract function that may serve as putative MS biomarkers. To date, no reviews have directly addressed the diagnostic performance of TMS in MS. The authors aimed to conduct a critical narrative review on the diagnostic performance of TMS in MS. Methods The authors searched the Embase, PubMed, Scopus, and Web of Science databases for studies that reported the sensitivity and/or specificity of any reported TMS technique compared to established clinical MS diagnostic criteria. Studies were summarized and critically appraised for their quality and validity. Results Seventeen of 1,073 records were included for data extraction and critical appraisal. Markers of demyelination and axonal damage-most notably, central motor conduction time (CMCT)-were specific, but not sensitive, for MS. Thirteen (76%), two (12%), and two (12%) studies exhibited high, unclear, and low risk of bias, respectively. No study demonstrated validity for TMS techniques as diagnostic biomarkers in MS. Conclusions CMCT has the potential to: (1) enhance the specificity of clinical MS diagnostic criteria by "ruling in" true-positives, or (2) revise a diagnosis from relapsing to progressive forms of MS. However, there is presently insufficient high-quality evidence to recommend any TMS technique in the diagnostic algorithm for MS.
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Affiliation(s)
- Nicholas J. Snow
- Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL, Canada
| | - Hannah M. Murphy
- Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL, Canada
| | - Arthur R. Chaves
- Faculty of Health Sciences, Interdisciplinary School of Health Sciences, University of Ottawa, Ottawa, ON, Canada
- Neuromodulation Research Clinic, The Royal’s Institute of Mental Health Research, Ottawa, ON, Canada
- Département de Psychoéducation et de Psychologie, Université du Québec en Outaouais, Gatineau, QC, Canada
| | - Craig S. Moore
- Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL, Canada
| | - Michelle Ploughman
- Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL, Canada
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Rogić Vidaković M, Ćurković Katić A, Pavelin S, Bralić A, Mikac U, Šoda J, Jerković A, Mastelić A, Dolić K, Markotić A, Đogaš Z, Režić Mužinić N. Transcranial Magnetic Stimulation Measures, Pyramidal Score on Expanded Disability Status Scale and Magnetic Resonance Imaging of Corticospinal Tract in Multiple Sclerosis. Bioengineering (Basel) 2023; 10:1118. [PMID: 37892848 PMCID: PMC10604490 DOI: 10.3390/bioengineering10101118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 09/20/2023] [Accepted: 09/22/2023] [Indexed: 10/29/2023] Open
Abstract
Probing the cortic ospinal tract integrity by transcranial magnetic stimulation (TMS) could help to understand the neurophysiological correlations of multiple sclerosis (MS) symptoms. Therefore, the study objective was, first, to investigate TMS measures (resting motor threshold-RMT, motor evoked potential (MEP) latency, and amplitude) of corticospinal tract integrity in people with relapsing-remitting MS (pwMS). Then, the study examined the conformity of TMS measures with clinical disease-related (Expanded Disability Status Scale-EDSS) and magnetic resonance imaging (MRI) results (lesion count) in pwMS. The e-field navigated TMS, MRI, and EDSS data were collected in 23 pwMS and compared to non-clinical samples. The results show that pwMS differed from non-clinical samples in MEP latency for upper and lower extremity muscles. Also, pwMS with altered MEP latency (prolonged or absent MEP response) had higher EDSS, general and pyramidal, functional scores than pwMS with normal MEP latency finding. Furthermore, the RMT intensity for lower extremity muscles was predictive of EDSS functional pyramidal scores. TMS/MEP latency findings classified pwMS as the same as EDSS functional pyramidal scores in 70-83% of cases and were similar to the MRI results, corresponding to EDSS functional pyramidal scores in 57-65% of cases. PwMS with altered MEP latency differed from pwMS with normal MEP latency in the total number of lesions in the brain corticospinal and cervical corticospinal tract. The study provides preliminary results on the correspondence of MRI and TMS corticospinal tract evaluation results with EDSS functional pyramidal score results in MS.
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Affiliation(s)
- Maja Rogić Vidaković
- Laboratory for Human and Experimental Neurophysiology, Department of Neuroscience, School of Medicine, University of Split, 21000 Split, Croatia; (A.J.); (Z.Đ.)
| | - Ana Ćurković Katić
- Department of Neurology, University Hospital of Split, 21000 Split, Croatia;
| | - Sanda Pavelin
- Department of Neurology, University Hospital of Split, 21000 Split, Croatia;
| | - Antonia Bralić
- Department of Interventional and Diagnostic Radiology, University Hospital of Split, 21000 Split, Croatia; (A.B.); (K.D.)
| | - Una Mikac
- Department of Psychology, Faculty of Humanities and Social Sciences University of Zagreb, 10000 Zagreb, Croatia;
| | - Joško Šoda
- Signal Processing, Analysis, Advanced Diagnostics Research and Education Laboratory (SPAADREL), Faculty of Maritime Studies, Department for Marine Electrical Engineering and Information Technologies, University of Split, 21000 Split, Croatia;
| | - Ana Jerković
- Laboratory for Human and Experimental Neurophysiology, Department of Neuroscience, School of Medicine, University of Split, 21000 Split, Croatia; (A.J.); (Z.Đ.)
| | - Angela Mastelić
- Department of Medical Chemistry and Biochemistry, School of Medicine, University of Split, 21000 Split, Croatia; (A.M.); (A.M.); (N.R.M.)
| | - Krešimir Dolić
- Department of Interventional and Diagnostic Radiology, University Hospital of Split, 21000 Split, Croatia; (A.B.); (K.D.)
- Department of Radiology, School of Medicine, University of Split, 21000 Split, Croatia
| | - Anita Markotić
- Department of Medical Chemistry and Biochemistry, School of Medicine, University of Split, 21000 Split, Croatia; (A.M.); (A.M.); (N.R.M.)
| | - Zoran Đogaš
- Laboratory for Human and Experimental Neurophysiology, Department of Neuroscience, School of Medicine, University of Split, 21000 Split, Croatia; (A.J.); (Z.Đ.)
| | - Nikolina Režić Mužinić
- Department of Medical Chemistry and Biochemistry, School of Medicine, University of Split, 21000 Split, Croatia; (A.M.); (A.M.); (N.R.M.)
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3
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Šoda J, Pavelin S, Vujović I, Rogić Vidaković M. Assessment of Motor Evoked Potentials in Multiple Sclerosis. SENSORS (BASEL, SWITZERLAND) 2023; 23:s23010497. [PMID: 36617096 PMCID: PMC9824873 DOI: 10.3390/s23010497] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 12/28/2022] [Accepted: 12/29/2022] [Indexed: 06/01/2023]
Abstract
Transcranial magnetic stimulation (TMS) is a noninvasive technique mainly used for the assessment of corticospinal tract integrity and excitability of the primary motor cortices. Motor evoked potentials (MEPs) play a pivotal role in TMS studies. TMS clinical guidelines, concerning the use and interpretation of MEPs in diagnosing and monitoring corticospinal tract integrity in people with multiple sclerosis (pwMS), were established almost ten years ago and refer mainly to the use of TMS implementation; this comprises the magnetic stimulator connected to a standard EMG unit, with the positioning of the coil performed by using the external landmarks on the head. The aim of the present work was to conduct a narrative literature review on the MEP assessment and outcome measures in clinical and research settings, assessed by TMS Methodological characteristics of different TMS system implementations (TMS without navigation, line-navigated TMS and e-field-navigated TMS); these were discussed in the context of mapping the corticospinal tract integrity in MS. An MEP assessment of two case reports, by using an e-field-navigated TMS, was presented; the results of the correspondence between the e-field-navigated TMS with MRI, and the EDSS classifications were presented. Practical and technical guiding principles for the improvement of TMS studies in MEP assessment for MS are discussed, suggesting the use of e-field TMS assessment in the sense that it can improve the accuracy of corticospinal tract integrity testing by providing a more objective correspondence of the neurophysiological (e-field-navigated TMS) and clinical (Expanded Disability Status Scale-EDSS) classifications.
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Affiliation(s)
- Joško Šoda
- Signal Processing, Analysis, and Advanced Diagnostics Research and Education Laboratory (SPAADREL), Faculty of Maritime Studies, University of Split, 21000 Split, Croatia
| | - Sanda Pavelin
- Department of Neurology, University Hospital of Split, 21000 Split, Croatia
| | - Igor Vujović
- Signal Processing, Analysis, and Advanced Diagnostics Research and Education Laboratory (SPAADREL), Faculty of Maritime Studies, University of Split, 21000 Split, Croatia
| | - Maja Rogić Vidaković
- Laboratory for Human and Experimental Neurophysiology, Department of Neuroscience, School of Medicine, University of Split, 21000 Split, Croatia
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Novel Drugs in a Pipeline for Progressive Multiple Sclerosis. J Clin Med 2022; 11:jcm11123342. [PMID: 35743410 PMCID: PMC9225445 DOI: 10.3390/jcm11123342] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/27/2022] [Accepted: 06/08/2022] [Indexed: 02/01/2023] Open
Abstract
Multiple sclerosis (MS) is a widely known inflammatory, demyelinating disease of the central nervous system. The pathogenesis of progressive multiple sclerosis (PMS) is a complex, multi-level process that causes therapeutic difficulties. Along with variables such as age and duration of the disease, pathogenetic mechanisms change from inflammatory to neurodegenerative processes. Therefore, the efficacy of available anti-inflammatory drugs approved for the treatment of PMS, such as ocrelizumab or siponimod, is limited in time. In search of innovative solutions, several research studies have been conducted to evaluate the effectiveness of drugs with neuroprotective or remyelinating effects in PMS, including biotin, ibudilast, simvastatin, alpha-lipoic acid, clemastine, amiloride, fluoxetine, riluzole, masitinib, opicinumab, and lamotrigine. The current review includes those compounds, which have entered the clinical phase of assessment, and the authors discuss future prospects for successful PMS treatment.
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Dubbioso R, Bove M, Boccia D, D'Ambrosio V, Nolano M, Manganelli F, Iodice R. Neurophysiological and behavioural correlates of ocrelizumab therapy on manual dexterity in patients with primary progressive multiple sclerosis. J Neurol 2022; 269:4791-4801. [PMID: 35419681 PMCID: PMC9363320 DOI: 10.1007/s00415-022-11114-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 12/20/2022]
Abstract
Background Hand dexterity impairment is a key feature of disability in people with primary progressive multiple sclerosis (PPMS). So far, ocrelizumab, a recombinant humanized monoclonal antibody that selectively depletes CD20-expressing B cells, is the only therapy approved for PPMS and recent analysis reported its ability to reduce the risk of upper limb disability progression. However, the neural mechanisms underlying hand impairment in PPMS and the brain networks behind the effect of ocrelizumab on manual dexterity are not fully understood. Objective Main aims of our study were: (i) to investigate neurophysiological and behavioural correlates of hand function impairment in subjects with PPMS, and (ii) to use neurophysiologic and behavioural measures to track the effects of ocrelizumab therapy on manual dexterity. Methods Seventeen PPMS patients and 17 healthy-controls underwent routine neurophysiological protocols assessing the integrity of cortico-spinal and somatosensory pathways and advanced transcranial magnetic stimulation (TMS) protocols evaluating inhibitory (short and long interval intracortical inhibition, short-latency afferent inhibition) and facilitatory (motor thresholds, intracortical facilitation, short-interval intracortical facilitation) circuits in the primary motor cortex. All subjects also underwent behavioural analysis of hand dexterity by means of nine-hole peg test and finger movement analysis, and hand strength with handgrip and three-point pinch test. Neurophysiological and clinical assessments of hand functionality were also performed after 1 year of ocrelizumab therapy. Results At baseline PPMS patients displayed a significant impairment of hand dexterity and strength compared to healthy controls (all p < 0.03). Neurophysiological study disclosed prolonged latencies of standard somatosensory and motor evoked potentials (all p < 0.025) and an overall reduction of intracortical excitability at TMS protocols, involving both excitatory and inhibitory circuits. Importantly, hand dexterity impairment, indexed by delayed 9HPT, correlated with TMS protocols investigating cortical sensorimotor integration (short-latency afferent inhibition, SAI), p = 0.009. Both parameters, 9HPT (p = 0.01) and SAI (p = 0.01), displayed a significant improvement after 1 year of therapy with ocrelizumab. Conclusion Intracortical sensorimotor networks are involved in hand dexterity dysfunction of PPMS. Ocrelizumab therapy displays a beneficial effect on hand dexterity impairment most likely through intracortical networks implicated in fast sensorimotor integration.
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Affiliation(s)
- Raffaele Dubbioso
- Department of Neurosciences, Reproductive Sciences and Odontostomatology, University of Naples Federico II, Via Sergio Pansini, 5. 80131, Napoli, Italy.
| | - Marco Bove
- IRCCS Ospedale Policlinico San Martino, Genova, Italy.,Section of Human Physiology, Department of Experimental Medicine, Università Degli Studi Di Genova, 16132, Genoa, Italy
| | - Daniele Boccia
- IRCCS Ospedale Policlinico San Martino, Genova, Italy.,Department of Neuroscience Genetics, Maternal and Child Health (DINOGMI)Center of Excellence for Biomedical Research (CEBR), University of Genoa, RehabilitationGenoa, Ophthalmology, Italy
| | - Vincenzo D'Ambrosio
- Department of Advanced Biomedical Sciences, University of Naples Federico II, Naples, Italy
| | - Maria Nolano
- Department of Neurosciences, Reproductive Sciences and Odontostomatology, University of Naples Federico II, Via Sergio Pansini, 5. 80131, Napoli, Italy.,Department of Neurology, Istituti Clinici Scientifici Maugeri IRCCS, 27100, Pavia, Italy
| | - Fiore Manganelli
- Department of Neurosciences, Reproductive Sciences and Odontostomatology, University of Naples Federico II, Via Sergio Pansini, 5. 80131, Napoli, Italy
| | - Rosa Iodice
- Department of Neurosciences, Reproductive Sciences and Odontostomatology, University of Naples Federico II, Via Sergio Pansini, 5. 80131, Napoli, Italy
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6
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Prognostic biomarkers in primary progressive multiple sclerosis: validating and scrutinizing multimodal evoked potentials. Clin Neurophysiol 2022; 137:152-158. [DOI: 10.1016/j.clinph.2022.02.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 02/07/2022] [Accepted: 02/23/2022] [Indexed: 11/20/2022]
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7
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Neurophysiological outcomes following mesenchymal stem cell therapy in multiple sclerosis. Clin Neurophysiol 2022; 136:69-81. [DOI: 10.1016/j.clinph.2022.01.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/22/2021] [Accepted: 01/05/2022] [Indexed: 11/18/2022]
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8
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Chen Y, Wei QC, Zhang MZ, Xie YJ, Liao LY, Tan HX, Guo QF, Gao Q. Cerebellar Intermittent Theta-Burst Stimulation Reduces Upper Limb Spasticity After Subacute Stroke: A Randomized Controlled Trial. Front Neural Circuits 2021; 15:655502. [PMID: 34776874 PMCID: PMC8578104 DOI: 10.3389/fncir.2021.655502] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 09/22/2021] [Indexed: 02/05/2023] Open
Abstract
Objective: This study aims to explore the efficacy of cerebellar intermittent theta-burst stimulation (iTBS) on upper limb spasticity in subacute stroke patients. Methods: A total of 32 patients with upper limb spasticity were enrolled and randomly assigned to treatment with cerebellar iTBS or sham stimulation before conventional physical therapy daily for 2 weeks. The primary outcomes included the modified Ashworth scale (MAS), the modified Tardieu scale (MTS), and the shear wave velocity (SWV). The secondary outcomes were the H-maximum wave/M-maximum wave amplitude ratio (Hmax/Mmax ratio), motor-evoked potential (MEP) latency and amplitude, central motor conduction time (CMCT), and the Barthel Index (BI). All outcomes were evaluated at baseline and after 10 sessions of intervention. Results: After the intervention, both groups showed significant improvements in the MAS, MTS, SWV, and BI. In addition, patients treated with cerebellar iTBS had a significant increase in MEP amplitude, and patients treated with sham stimulation had a significant decrease in Hmax/Mmax ratio. Compared with the sham stimulation group, the MAS, MTS, and SWV decreased more in the cerebellar iTBS group. Conclusion: Cerebellar iTBS is a promising adjuvant tool to reinforce the therapeutic effect of conventional physical therapy in upper limb spasticity management after subacute stroke (Chinese Clinical Trial Registry: ChiCTR1900026516).
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Affiliation(s)
- Yi Chen
- Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Rehabilitation Medicine in Sichuan Province, Chengdu, China
| | - Qing-Chuan Wei
- Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Rehabilitation Medicine in Sichuan Province, Chengdu, China
| | - Ming-Zhi Zhang
- Department of Ultrasound Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Yun-Juan Xie
- Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Rehabilitation Medicine in Sichuan Province, Chengdu, China
| | - Ling-Yi Liao
- Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Rehabilitation Medicine in Sichuan Province, Chengdu, China.,Daping Hospital, Third Military Medical University, Chongqing, China
| | - Hui-Xin Tan
- Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Rehabilitation Medicine in Sichuan Province, Chengdu, China
| | - Qi-Fan Guo
- Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Rehabilitation Medicine in Sichuan Province, Chengdu, China
| | - Qiang Gao
- Department of Rehabilitation Medicine, West China Hospital, Sichuan University, Chengdu, China.,Key Laboratory of Rehabilitation Medicine in Sichuan Province, Chengdu, China
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Multimodal Evoked Potentials as Candidate Prognostic and Response Biomarkers in Clinical Trials of Multiple Sclerosis. J Clin Neurophysiol 2021; 38:171-180. [PMID: 33958567 DOI: 10.1097/wnp.0000000000000723] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
SUMMARY Evoked potentials (EPs) measure quantitatively and objectively the alterations of central signal propagation in multiple sclerosis and have long been used for diagnosis. More recently, their utility for prognosis has been demonstrated in several studies, summarizing multiple EP modalities in a single score. In particular, visual, somatosensory, and motor EPs are useful because of their sensitivity to pathology in the frequently affected optic nerve, somatosensory tract, and pyramidal system. Quantitative EP scores show higher sensitivity to change than clinical assessment and may be used to monitor disease progression. Visual EP and the visual system have served as a model to study remyelinating therapies in the setting of acute and chronic optic neuritis. This review presents rationale and evidence for using multimodal EP as prognostic and response biomarkers in clinical trials, targeting remyelination or halting disease progression in multiple sclerosis.
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Pisa M, Chieffo R, Congiu M, Dalla Costa G, Esposito F, Romeo M, Comola M, Comi G, Leocani L. Intracortical motor conduction is associated with hand dexterity in progressive multiple sclerosis. Mult Scler 2020; 27:1222-1229. [PMID: 32975472 DOI: 10.1177/1352458520960374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Hand dexterity dysfunction is a key feature of disability in people with progressive multiple sclerosis (PMS). It underlies corticospinal tract (CST) and cerebellar integrity, as well as disruption of cortical networks, which are hardly assessed by standard techniques. Transcranial magnetic stimulation is a promising tool for evaluating the integrity of intracortical motor pathways. OBJECTIVE To investigate neurophysiological correlates of motor hand impairment in PMS. METHODS Antero-posterior (AP) stimulation of the primary motor cortex activates the CST indirectly through polysynaptic pathways, while a direct CST activation occurs with latero-medial (LM) directed current. Thirty PMS and 15 healthy controls underwent dominant hand motor evoked potentials (MEP) using AP and LM-directed stimulation, and a clinical assessment of dexterity (nine-hole peg test) and strength (MRC scale, grip and pinch). RESULTS PMS with AP-LM latency difference 2.5 standard deviation above the mean of controls (33%) showed worse dexterity but no difference in upper limb strength. Accordingly, AP-LM latency shortening predicted dexterity (R2 = 0.538, p < 0.001), but not strength impairment. On the contrary, absolute MEP latencies only correlated with strength (grip: R2 = 0.381, p = 0.014; MRC: R2 = 0.184, p = 0.041). CONCLUSION AP-LM latency shortening may be used to assess the integrity polysynaptic intracortical networks implicated in dexterity impairment.
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Affiliation(s)
- Marco Pisa
- University Vita-Salute San Raffaele, Milan, Italy/Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy/Experimental Neurophysiology Unit, The Institute of Experimental Neurology (INSPE), IRCCS Ospedale San Raffaele, Milan, Italy
| | - Raffaella Chieffo
- Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy/Experimental Neurophysiology Unit, The Institute of Experimental Neurology (INSPE), IRCCS Ospedale San Raffaele, Milan, Italy
| | - Martina Congiu
- Experimental Neurophysiology Unit, The Institute of Experimental Neurology (INSPE), IRCCS Ospedale San Raffaele, Milan, Italy
| | - Gloria Dalla Costa
- University Vita-Salute San Raffaele, Milan, Italy/Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Federica Esposito
- Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Marzia Romeo
- Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Mauro Comola
- Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Giancarlo Comi
- University Vita-Salute San Raffaele, Milan, Italy/Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy/Experimental Neurophysiology Unit, The Institute of Experimental Neurology (INSPE), IRCCS Ospedale San Raffaele, Milan, Italy
| | - Letizia Leocani
- University Vita-Salute San Raffaele, Milan, Italy/Department of Neurorehabilitation, IRCCS Ospedale San Raffaele, Milan, Italy/Experimental Neurophysiology Unit, The Institute of Experimental Neurology (INSPE), IRCCS Ospedale San Raffaele, Milan, Italy
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11
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Hardmeier M, Schindler C, Kuhle J, Fuhr P. Validation of Quantitative Scores Derived From Motor Evoked Potentials in the Assessment of Primary Progressive Multiple Sclerosis: A Longitudinal Study. Front Neurol 2020; 11:735. [PMID: 32793104 PMCID: PMC7393441 DOI: 10.3389/fneur.2020.00735] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 06/15/2020] [Indexed: 11/13/2022] Open
Abstract
Objective: To evaluate the sensitivity to change of differently calculated quantitative scores from motor evoked potentials (MEP) in patients with primary progressive multiple sclerosis (PPMS). Methods: Twenty patients with PPMS had MEP to upper and lower limbs at baseline, years 1 and 2 measured in addition to clinical assessment [Expanded Disability Status Scale (EDSS), ambulation score]; a subsample (n = 9) had a nine-hole peg test (NHPT) and a timed 25-foot walk (T25FW). Quantitative MEP scores for upper limbs (qMEP-UL), lower limbs (qMEP-LL), and all limbs (qMEP) were calculated in three different ways, based on z-transformed central motor conduction time (CMCT), shortest corticomuscular latency (CxM-sh), and mean CxM (CxM-mn). Changes in clinical measures and qMEP metrics were analyzed by repeated-measures analysis of variance (rANOVA), and a factor analysis was performed on change in qMEP metrics. Results: Expanded Disability Status Scale and ambulation score progressed in the rANOVA model (p < 0.05; post-hoc comparison baseline-year 2, p < 0.1). Lower limb and combined qMEP scores showed significant deterioration of latency (p < 0.01, MEP-LL_CxM-sh: p < 0.05) and in post-hoc comparisons (baseline-year 2, p < 0.05), qMEP_CxM-mn even over 1 year (p < 0.05). Effect sizes were higher for qMEP scores than for clinical measures, and slightly but consistently higher when based on CxM-mn compared to CxM-sh or CMCT. Subgroup analysis yielded no indication of higher sensitivity of timed clinical measures over qMEP scores. Two independent factors were detected, the first mainly associated with qMEP-LL, the second with qMEP-UL, explaining 65 and 29% of total variability, respectively. Conclusions: Deterioration in qMEP scores occurs earlier than EDSS progression in patients with PPMS. Upper and lower limb qMEP scores contribute independently to measuring change, and qMEP scores based on mean CxM are advantageous. The capability to detect subclinical changes longitudinally is a unique property of EP and complementary to clinical assessment. These features underline the role of EP as candidate biomarkers to measure effects of therapeutic interventions in PPMS.
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Affiliation(s)
- Martin Hardmeier
- Department of Neurology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Christian Schindler
- Swiss Tropical and Public Health Institute (Swiss TPH), University of Basel, Basel, Switzerland
| | - Jens Kuhle
- Department of Neurology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Peter Fuhr
- Department of Neurology, University Hospital Basel, University of Basel, Basel, Switzerland
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