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Wei KC, Wang TG, Hsiao MY. The Cortical and Subcortical Neural Control of Swallowing: A Narrative Review. Dysphagia 2024; 39:177-197. [PMID: 37603047 DOI: 10.1007/s00455-023-10613-x] [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: 09/24/2022] [Accepted: 08/03/2023] [Indexed: 08/22/2023]
Abstract
Swallowing is a sophisticated process involving the precise and timely coordination of the central and peripheral nervous systems, along with the musculatures of the oral cavity, pharynx, and airway. The role of the infratentorial neural structure, including the swallowing central pattern generator and cranial nerve nuclei, has been described in greater detail compared with both the cortical and subcortical neural structures. Nonetheless, accumulated data from analysis of swallowing performance in patients with different neurological diseases and conditions, along with results from neurophysiological studies of normal swallowing have gradually enhanced understanding of the role of cortical and subcortical neural structures in swallowing, potentially leading to the development of treatment modalities for patients suffering from dysphagia. This review article summarizes findings about the role of both cortical and subcortical neural structures in swallowing based on results from neurophysiological studies and studies of various neurological diseases. In sum, cortical regions are mainly in charge of initiation and coordination of swallowing after receiving afferent information, while subcortical structures including basal ganglia and thalamus are responsible for movement control and regulation during swallowing through the cortico-basal ganglia-thalamo-cortical loop. This article also presents how cortical and subcortical neural structures interact with each other to generate the swallowing response. In addition, we provided the updated evidence about the clinical applications and efficacy of neuromodulation techniques, including both non-invasive brain stimulation and deep brain stimulation on dysphagia.
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Affiliation(s)
- Kuo-Chang Wei
- Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, No. 7, Zhongshan South Road, Zhongzheng District, Taipei, 100, Taiwan
- Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital Jinshan Branch, New Taipei City, Taiwan
| | - Tyng-Guey Wang
- Department of Physical Medicine and Rehabilitation, College of Medicine, National Taiwan University, No. 7, Zhongshan South Road, Zhongzheng District, Taipei, 100, Taiwan
- Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, No. 7, Zhongshan South Road, Zhongzheng District, Taipei, 100, Taiwan
| | - Ming-Yen Hsiao
- Department of Physical Medicine and Rehabilitation, College of Medicine, National Taiwan University, No. 7, Zhongshan South Road, Zhongzheng District, Taipei, 100, Taiwan.
- Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, No. 7, Zhongshan South Road, Zhongzheng District, Taipei, 100, Taiwan.
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Zolezzi DM, Larsen DB, McPhee M, Graven-Nielsen T. Effects of pain on cortical homeostatic plasticity in humans: a systematic review. Pain Rep 2024; 9:e1141. [PMID: 38444774 PMCID: PMC10914232 DOI: 10.1097/pr9.0000000000001141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 12/09/2023] [Accepted: 12/28/2023] [Indexed: 03/07/2024] Open
Abstract
Homeostatic plasticity (HP) is a negative feedback mechanism that prevents excessive facilitation or depression of cortical excitability (CE). Cortical HP responses in humans have been investigated by using 2 blocks of noninvasive brain stimulation with a no-stimulation block in between. A healthy HP response is characterized by reduced CE after 2 excitatory stimulation blocks and increased CE when using inhibitory stimulation. Conversely, impaired HP responses have been demonstrated in experimental and chronic pain conditions. Therefore, this systematic review aimed to provide an overview of the effect of pain on cortical HP in humans. Scopus, Embase, and PubMed were searched from inception until November 20, 2023. The included studies (1) compared experimental or clinical pain conditions with healthy controls, (2) induced HP using 2 blocks of stimulation with a no-stimulation interval, and (3) evaluated CE measures such as motor-evoked potentials. Four studies were included, consisting of 5 experiments and 146 participants, of whom 63 were patients with chronic pain and 48 were subjected to an experimental pain model. This systematic review found support for an HP impairment in pain compared with that in pain-free states, reflected by a lack of CE reduction after excitatory-excitatory HP induction over the primary motor cortex. Inhibitory-inhibitory HP induction did not produce a consistent HP response across studies, independent of pain or pain-free states. Standardization of HP induction protocols and outcome calculations is needed to ensure reproducibility and study comparison. Future HP studies may consider investigating sensory domains including nociception, which would further our understanding of abnormal HP regulation in pain conditions.
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Affiliation(s)
- Daniela M. Zolezzi
- Center for Neuroplasticity and Pain (CNAP), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - Dennis B. Larsen
- Center for Neuroplasticity and Pain (CNAP), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - Megan McPhee
- Center for Neuroplasticity and Pain (CNAP), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - Thomas Graven-Nielsen
- Center for Neuroplasticity and Pain (CNAP), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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Bengisu S, Demir N, Krespi Y. Effectiveness of Conventional Dysphagia Therapy (CDT), Neuromuscular Electrical Stimulation (NMES), and Transcranial Direct Current Stimulation (tDCS) in Acute Post-Stroke Dysphagia: A Comparative Evaluation. Dysphagia 2024; 39:77-91. [PMID: 37247074 DOI: 10.1007/s00455-023-10595-w] [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: 10/17/2022] [Accepted: 05/19/2023] [Indexed: 05/30/2023]
Abstract
This study aims to compare the effectiveness of conventional dysphagia therapy (CDT), neuromuscular electrical stimulation (NMES), and transcranial direct current stimulation (tDCS) in the treatment of post-stroke dysphagia. A single-blind randomized controlled trial was conducted with 40 acute stroke patients - 18 females and 22 males with a mean age of 65.8 ± 11.9. The subjects were grouped into 4, with 10 individuals in each. The procedures administered to groups were as follows: the first group, sham tDCS and sham NMES; the second group, tDCS and sham NMES; the third group, NMES and sham tDCS; and the fourth group, all therapy procedures. CDT was applied to all groups either as a standalone procedure or combined with one or two of the instrumental techniques. Gugging Swallowing Screen (GUSS) and Videofluoroscopic Swallowing Study (VFSS) were employed to determine the severity of dysphagia and the effectiveness of treatment modalities. Additionally, the Penetration Aspiration Scale (PAS), Functional Oral Intake Scale (FOIS), and Dysphagia Severity Rating Scale (DSRS) were administered to interpret VFSS data. Pre- and post-treatment comparisons of all groups have revealed a statistically significant difference for all parameters except for the PAS scores at International Dysphagia Diet Standardization Initiative (IDDSI)-Level 4 consistencies. However, the differences between pre- and post-treatment scores of the fourth group across all parameters were significant - GUSS (p = 0.005), FOIS (p = 0.004), DSRS (p = 0.005), PAS IDDSI-4 (p = 0.027), PAS IDDSI-0 (p = 0.004). Inter-group comparisons, on the other hand, pointed out that the difference between pre- and post-treatment GUSS, FOIS, DSRS, and PAS scores at IDDSI Level-0 consistencies was statistically significant for all groups - GUSS (p = 0,009), FOIS (p = 0,004), DSRS (p = 0,002), PAS IDDSI-0 (p = 0,049). Closer examination of treatment groups indicated that the tDCS + CDT group, the NMES + CDT group, and the group that underwent the combination of three modalities made better progress than the one that was treated with only CDT. Though not statistically significant, the NMES + CDT group achieved better improvement than the tDCS + CDT group. This study has yielded that the group in which NMES, tDCS, and CDT were applied in combination has achieved better results than all the other groups. All treatment modalities applied to accelerate the general recovery process in acute stroke patients with dysphagia were found to be effective for the treatment of post-stroke swallowing disorders. The use of instrumental treatments such as NMES and tDCS enhanced the effectiveness of the treatment and provided more significant progress. Furthermore, combining treatment modalities such as NMES and tDCS was more effective when compared to using only conventional therapy. As a result, the most effective treatment outcomes were obtained by the group receiving CDT, NMES, and tDCS in combination. Therefore, the use of combined approaches has been recommended in appropriate patients; yet the provisional results should be tested in randomized trials with more participants.
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Affiliation(s)
- Serkan Bengisu
- Department of Speech and Language Therapy, Faculty of Health Sciences, Fenerbahçe University, Istanbul, Turkey.
| | - Numan Demir
- Faculty of Physical Therapy and Rehabilitation, Hacettepe University, Ankara, Turkey
| | - Yakup Krespi
- Department of Neurology, Faculty of Medicine, Istinye University, Istanbul, Turkey
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Dashtelei AA, Nitsche MA, Salehinejad MA, Habibi AH, Bakhtyiari J, Khatoonabadi AR. Adjunctive transcranial direct current stimulation to improve swallowing functions in Parkinson's disease. EXCLI JOURNAL 2024; 23:95-107. [PMID: 38487086 PMCID: PMC10938234 DOI: 10.17179/excli2023-6496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 01/04/2024] [Indexed: 03/17/2024]
Abstract
Swallowing problems are frequent in Parkinson's disease (PD). The aim of this study was to determine the effectiveness of combined transcranial Direct Current Stimulation (tDCS) and Conventional Dysphagia Therapy (CDT) on dysphagia in PD patients. Twenty PD patients with dysphagia were randomized into two groups: combination therapy (anodal tDCS plus CDT) and sham tDCS combined with CDT. Anodal or sham tDCS, bilaterally over the pharyngeal motor cortex, was applied with one mA during the first 20 min (real) or 30 s (sham) of CDT, which was delivered for 30 min. Both groups received twice-daily treatment sessions within two weeks. Swallowing functions were evaluated before, immediately, and one month after the intervention via the Penetration-Aspiration Scale (PAS), and the Swallowing Disorder Questionnaire (SDQ) as the primary outcome measures, and the Dysphagia Handicap Index (DHI) as the secondary outcome measure. The results showed a significant improvement of PAS scores from baseline to post-intervention and baseline to follow-up in both groups without significant differences between groups (t=0.03, p=0.973, and t=1.27, p=0.22 for post-intervention and follow-up time points, respectively). The results showed a significant reduction of SDQ and DHI scores in both groups after the intervention, but the magnitude of the change was significantly larger in the anodal tDCS group at the post-intervention (ta=2.58, pa=0.019 and tb=2.96, pb=0.008) and follow-up (ta=2.65, pa=0.016 and tb=2.97, pb=0.008) time points. This study provides preliminary evidence that bi-hemispheric anodal tDCS combined with CDT enhances swallowing functions in patients with Parkinson's disease more than CDT alone.
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Affiliation(s)
- Ali Akbar Dashtelei
- Department of Speech Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
| | - Michael A. Nitsche
- Department Psychology and Neurosciences, Leibniz Research Centre for Working Environment and Human Factors, IfADo, Dortmund, Germany
- German Centre for Mental Health (DZPG), Bochum/Marburg, Germany
- Bielefeld University, University Hospital OWL, Protestant Hospital of Bethel Foundation, University Clinic of Psychiatry and Psychotherapy, Bielefeld, Germany
| | - Mohammad Ali Salehinejad
- Department Psychology and Neurosciences, Leibniz Research Centre for Working Environment and Human Factors, IfADo, Dortmund, Germany
| | - Amir Hassan Habibi
- Bielefeld University, University Hospital OWL, Protestant Hospital of Bethel Foundation, University Clinic of Psychiatry and Psychotherapy, Bielefeld, Germany
| | - Jalal Bakhtyiari
- Department of Speech Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
| | - Ahmad R. Khatoonabadi
- Department of Speech Therapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
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Hou M, Zhao Y, Zhao L, Yuan X, Liu Z, Li H. Efficacy of game training combined with surface electromyography biofeedback on post-stroke dysphagia. Geriatr Nurs 2024; 55:255-262. [PMID: 38091711 DOI: 10.1016/j.gerinurse.2023.11.019] [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: 08/30/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 02/06/2024]
Abstract
OBJECTIVE To explore the efficacy of game training combined with surface electromyography biofeedback (sEMG-BF) in the treatment of dysphagia after early stroke. METHODS Ninety patients with early post-stroke dysphagia (PSD), who were diagnosed and treated from March 2021 to December 2022, were divided randomly into a control group (30 cases), experimental group 1 (30 cases) and experimental group 2 (30 cases). The control group received routine swallowing rehabilitation and transcranial direct current stimulation. Experimental group 1 received sEMG-BF in conjunction with the care provided to the control group. Experimental group 2 received sEMG-BF and game training in addition to the care provided to the control group. Before and after treatment, all three patient groups were evaluated using the WADA water swallowing test, the Functional Oral Intake Scale (FOIS), sEMG and a tongue manometer test. RESULTS Before treatment, there was no significant difference (P > 0.05) among the three groups of patients in terms of WADA water swallowing rating, FOIS score, submandibular muscle sEMG peak, swallowing time limit and maximum tongue pressure. After treatment, all three groups exhibited improvements in these indices compared with those before treatment (P < 0.05). Experimental group 1 showed greater improvement than the control group (P < 0.05), and experimental group 2 exhibited greater improvement than experimental group 1 and the control group (P < 0.05). CONCLUSION Game training combined with sEMG-BF can significantly improve the swallowing function of patients with PSD.
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Affiliation(s)
- Mushao Hou
- Department of Rehabilitation, the Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China
| | - Yijie Zhao
- Department of Rehabilitation, the Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China
| | - Long Zhao
- Department of Rehabilitation, the Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China
| | - Xiaokai Yuan
- Department of Rehabilitation, the Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China
| | - Zibo Liu
- Department of Endocrinology, the Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China
| | - Hongling Li
- Department of Rehabilitation, the Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China.
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Gómez-García N, Álvarez-Barrio L, Leirós-Rodríguez R, Soto-Rodríguez A, Andrade-Gómez E, Hernández-Lucas P. Transcranial direct current stimulation for post-stroke dysphagia: a meta-analysis. J Neuroeng Rehabil 2023; 20:165. [PMID: 38082316 PMCID: PMC10712182 DOI: 10.1186/s12984-023-01290-w] [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: 09/30/2023] [Accepted: 11/30/2023] [Indexed: 12/18/2023] Open
Abstract
BACKGROUND Strokes may cause some swallowing difficulty or associated dysphagia in 25-80% of patients. This phenomenon has been linked to increased morbidity and mortality. Therefore, the aim of this study was to evaluate the efficacy of transcranial direct current stimulation in patients with dysphagia in post-stroke patients. METHODS A systematic search in PubMed, Scopus, Web of Science and MEDLINE was conducted. The articles must have to evaluate an intervention that included transcranial direct current stimulation; the sample had to consist exclusively of patients with post-stroke dysphagia; and the experimental design consisted of randomized controlled trial. Difference in mean differences and their 95% confidence interval were calculated as the between-group difference in means divided by the pooled standard deviation. The I2 statistic was used to determine the degree of heterogeneity. RESULTS Of the 9 investigations analyzed, all applied transcranial direct current stimulation in combination with conventional dysphagia therapy to the experimental group. All the studies analyzed identified improvements in swallowing function and meta-analysis confirmed their strong effect on reducing the risk of penetration and aspiration (Hedges's g = 0.55). The results showed that participants who received transcranial direct current stimulation significantly improved swallowing function. CONCLUSIONS Transcranial direct current stimulation has positive effects in the treatment of poststroke dysphagia by improving swallowing function, oral and pharyngeal phase times and the risk of penetration and aspiration. Furthermore, its combination with conventional dysphagia therapy, balloon dilatation with catheter or training of the swallowing muscles ensures improvement of swallowing function. PROSPERO registration ID CRD42022314949.
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Affiliation(s)
- Nerea Gómez-García
- Nursing and Physical Therapy Department, University of Leon, Astorga Ave., 24401, Ponferrada, Spain
| | - Lorena Álvarez-Barrio
- Nursing and Physical Therapy Department, University of Leon, Astorga Ave., 24401, Ponferrada, Spain
| | - Raquel Leirós-Rodríguez
- SALBIS Research Group, Nursing and Physical Therapy Department, University of Leon, Astorga Ave., 24401, Ponferrada, Spain
| | - Anxela Soto-Rodríguez
- Pneumology Service, Ourense Hospital, Galician Health Service, 32005, Ourense, Spain
| | - Elena Andrade-Gómez
- Department of Nursing, University of La Rioja, La Rioja, 26004, Logroño, Spain.
| | - Pablo Hernández-Lucas
- Faculty of Physiotherapy, University of Vigo, Campus A Xunqueira, 36005, Pontevedra, Spain
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Wang L, Shi A, Xue H, Li Q, Wang J, Yang H, Hong H, Lu Q, Cheng J. Efficacy of Transcranial Direct Current Stimulation Combined with Conventional Swallowing Rehabilitation Training on Post-stroke Dysphagia. Dysphagia 2023; 38:1537-1545. [PMID: 37142734 PMCID: PMC10611834 DOI: 10.1007/s00455-023-10581-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 04/20/2023] [Indexed: 05/06/2023]
Abstract
To observe the clinical effects of transcranial direct current stimulation (tDCS) combined with conventional swallowing rehabilitation training on post-stroke dysphagia and explore its long-term efficacy. A total of 40 patients with dysphagia after the first stroke were randomly divided into a treatment group (n = 20) and a conventional group (n = 20). The treatment group received tDCS combined with conventional swallowing rehabilitation training, while the conventional group only received conventional swallowing rehabilitation training. The Standardized Swallowing Assessment (SSA) Scale and the Penetration-Aspiration Scale (PAS) were used to assess dysphagia before and after treatment, at the end of 10 treatments, and at the 3-month follow-up. The changes in infection indicators [the white blood cell (WBC), C-reactive protein (CRP) and procalcitonin (PCT)], the oxygenation indicator [arterial partial pressure of oxygen (PaO2)] and nutrition-related indicators [hemoglobin (Hb) and serum prealbumin (PAB)] were compared before and after treatment. The SSA and PAS scores were lower in both groups after treatment than before treatment, and the difference was statistically significant (P < 0.01). The SSA and PAS scores of the treatment group were lower than those of the conventional group before and after treatment and during follow-up, and the difference was statistically significant (P < 0.05, P < 0.01). A within-group comparison showed that WBC, CRP and PCT after treatment were lower than those before treatment, and the difference was statistically significant (P < 0.05). The PaO2, Hb and serum PAB were higher after treatment than before treatment, with a statistically significant difference (P < 0.05). The WBC, CRP and PCT of the tDCS group were lower than those of the conventional group, and PaO2, Hb and serum PAB were higher in the treatment group than in the conventional group, with a statistically significant difference (P < 0.01). The tDCS combined with conventional swallowing rehabilitation training can improve dysphagia with a better effect than conventional swallowing rehabilitation training and has a certain long-term efficacy. In addition, tDCS combined with conventional swallowing rehabilitation training can improve nutrition and oxygenation and reduce infection levels.
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Affiliation(s)
- Lingyan Wang
- Department of Rehabilitation Medicine, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China.
| | - Aiqun Shi
- Department of Rehabilitation Medicine, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
| | - Hui Xue
- Electroencephalogram Room, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
| | - Qiwei Li
- Department of Rehabilitation Medicine, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
| | - Jiasheng Wang
- Department of Rehabilitation Medicine, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
| | - Heliang Yang
- Department of Rehabilitation Medicine, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
| | - Hong Hong
- Department of Rehabilitation Medicine, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
| | - Qiaomiao Lu
- Department of Rehabilitation Medicine, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
| | - Jiaping Cheng
- Electroencephalogram Room, Jinhua Hospital of TCM Affiliated to Zhejiang University of Traditional Chinese Medicine, 496# Shuangxixi Road, 321017, Jinhua, Zhejiang, China
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Cheng I, Sasegbon A, Hamdy S. Evaluating the Therapeutic Application of Neuromodulation in the Human Swallowing System. Dysphagia 2023; 38:1005-1024. [PMID: 36239821 PMCID: PMC10326109 DOI: 10.1007/s00455-022-10528-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 09/30/2022] [Indexed: 11/03/2022]
Abstract
In the last two decades, the focus of neurogenic dysphagia management has moved from passive compensatory strategies to evidence-based rehabilitative approaches. Advances in technology have enabled the development of novel treatment approaches such as neuromodulation techniques, which target the promotion of neurological reorganization for functional recovery of swallowing. Given the rapid pace of development in the field, this review aims to summarize the current findings on the effects of neuromodulation techniques on the human swallowing system and evaluate their therapeutic potential for neurogenic dysphagia. Implications for future clinical research and practical considerations for using neuromodulation in clinical practice will also be discussed.
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Affiliation(s)
- Ivy Cheng
- Centre for Gastrointestinal Sciences, Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Ayodele Sasegbon
- Centre for Gastrointestinal Sciences, Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Shaheen Hamdy
- Centre for Gastrointestinal Sciences, Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.
- Centre for Gastrointestinal Sciences, University of Manchester, Clinical Sciences Building, Salford Royal Foundation Trust, Eccles Old Road, Salford, M6 8HD, UK.
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Yang S, Park JW, Min K, Lee YS, Song YJ, Choi SH, Kim DY, Lee SH, Yang HS, Cha W, Kim JW, Oh BM, Seo HG, Kim MW, Woo HS, Park SJ, Jee S, Oh JS, Park KD, Jin YJ, Han S, Yoo D, Kim BH, Lee HH, Kim YH, Kang MG, Chung EJ, Kim BR, Kim TW, Ko EJ, Park YM, Park H, Kim MS, Seok J, Im S, Ko SH, Lim SH, Jung KW, Lee TH, Hong BY, Kim W, Shin WS, Lee YC, Park SJ, Lim J, Kim Y, Lee JH, Ahn KM, Paeng JY, Park J, Song YA, Seo KC, Ryu CH, Cho JK, Lee JH, Choi KH. Clinical Practice Guidelines for Oropharyngeal Dysphagia. Ann Rehabil Med 2023; 47:S1-S26. [PMID: 37501570 PMCID: PMC10405672 DOI: 10.5535/arm.23069] [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: 06/08/2023] [Accepted: 06/09/2023] [Indexed: 07/29/2023] Open
Abstract
OBJECTIVE Dysphagia is a common clinical condition characterized by difficulty in swallowing. It is sub-classified into oropharyngeal dysphagia, which refers to problems in the mouth and pharynx, and esophageal dysphagia, which refers to problems in the esophageal body and esophagogastric junction. Dysphagia can have a significant negative impact one's physical health and quality of life as its severity increases. Therefore, proper assessment and management of dysphagia are critical for improving swallowing function and preventing complications. Thus a guideline was developed to provide evidence-based recommendations for assessment and management in patients with dysphagia. METHODS Nineteen key questions on dysphagia were developed. These questions dealt with various aspects of problems related to dysphagia, including assessment, management, and complications. A literature search for relevant articles was conducted using Pubmed, Embase, the Cochrane Library, and one domestic database of KoreaMed, until April 2021. The level of evidence and recommendation grade were established according to the Grading of Recommendation Assessment, Development and Evaluation methodology. RESULTS Early screening and assessment of videofluoroscopic swallowing were recommended for assessing the presence of dysphagia. Therapeutic methods, such as tongue and pharyngeal muscle strengthening exercises and neuromuscular electrical stimulation with swallowing therapy, were effective in improving swallowing function and quality of life in patients with dysphagia. Nutritional intervention and an oral care program were also recommended. CONCLUSION This guideline presents recommendations for the assessment and management of patients with oropharyngeal dysphagia, including rehabilitative strategies.
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Affiliation(s)
- Seoyon Yang
- Department of Rehabilitation Medicine, Ewha Womans University Seoul Hospital, Ewha Womans University College of Medicine, Seoul, Korea
| | - Jin-Woo Park
- Department of Physical Medicine and Rehabilitation, Dongguk University Ilsan Hospital, Goyang, Korea
| | - Kyunghoon Min
- Department of Rehabilitation Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Yoon Se Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Young-Jin Song
- Department of Occupational Therapy, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Seong Hee Choi
- Department Audiology and Speech-Language Pathology, Daegu Catholic University, Gyoungsan, Korea
| | - Doo Young Kim
- Department of Rehabilitation Medicine, International St. Mary’s Hospital, Catholic Kwandong University College of Medicine, Incheon, Korea
| | - Seung Hak Lee
- Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Hee Seung Yang
- Department of Physical Medicine and Rehabilitation, Veterans Health Service Medical Center, Seoul, Korea
| | - Wonjae Cha
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Ji Won Kim
- Department of Otolaryngology, Inha University College of Medicine, Incheon, Korea
| | - Byung-Mo Oh
- Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Han Gil Seo
- Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Min-Wook Kim
- Department of Rehabilitation Medicine, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea
| | - Hee-Soon Woo
- Department of Occupational Therapy, School of Medicine, Wonkwang University, Iksan, Korea
| | - Sung-Jong Park
- Department of Speech Therapy, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sungju Jee
- Department of Rehabilitation Medicine, Chungnam National University Hospital, College of Medicine, Chungnam National University, Daejeon, Korea
| | - Ju Sun Oh
- Department of Rehabilitation Medicine, Seoul Medical Center, Seoul, Korea
| | - Ki Deok Park
- Department of Rehabilitation Medicine, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea
| | - Young Ju Jin
- Department of Otorhinolaryngology-Head and Neck Surgery, Kangwon National University Hospital, Kangwon National University College of Medicine, Chuncheon, Korea
| | - Sungjun Han
- Department of Otolaryngology-Head and Neck Surgery, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - DooHan Yoo
- Department of Occupational Therapy, Konyang University, Daejeon, Korea
| | - Bo Hae Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Dongguk University Ilsan Hospital, Goyang, Korea
| | - Hyun Haeng Lee
- Deptartment of Rehabilitation Medicine, Konkuk University Medical Center, Seoul, Korea
| | - Yeo Hyung Kim
- Department of Rehabilitation Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Min-Gu Kang
- Department of Physical Medicine and Rehabilitation, Dong-A University College of Medicine, Busan, Korea
| | - Eun-Jae Chung
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - Bo Ryun Kim
- Department of Physical Medicine and Rehabilitation, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea
| | - Tae-Woo Kim
- Department of Rehabilitation Medicine, National Traffic Injury Rehabilitation Hospital, Yangpyeong, Korea
- Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Eun Jae Ko
- Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Young Min Park
- Department of Otorhinolaryngology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Hanaro Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
| | - Min-Su Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Jungirl Seok
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul, Korea
| | - Sun Im
- Department of Rehabilitation Medicine, Bucheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea
| | - Sung-Hwa Ko
- Department of Rehabilitation Medicine, Pusan National University & Pusan National University Yangsan Hospital, Yangsan, Korea
| | - Seong Hoon Lim
- Department of Rehabilitation Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Kee Wook Jung
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Tae Hee Lee
- Department of Gastroenterology, Konyang University College of Medicine, Daejeon, Korea
| | - Bo Young Hong
- Department of Rehabilitation Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Woojeong Kim
- Deptartment of Nutrition & Food Control, Gangnam Severance Hospital, Seoul, Korea
| | - Weon-Sun Shin
- Deptartment of Food & Nutrition, College of Human Ecology, Hanyang University, Seoul, Korea
| | - Young Chan Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea
| | - Sung Joon Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University Gwangmyeong Hospital, Chung-Ang University College of Medicine, Gwangmyeong, Korea
| | - Jeonghyun Lim
- Department of Food Service & Nutrition Care, Seoul National University Hospital, Seoul, Korea
| | - Youngkook Kim
- Department of Rehabilitation Medicine, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | | | - Kang-Min Ahn
- Department of Oral and Maxillofacial Surgery, University of Ulsan College of Medicine, Seoul, Korea
| | - Jun-Young Paeng
- Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - JeongYun Park
- Department of Clinical Nursing, University of Ulsan, Seoul, Korea
| | - Young Ae Song
- Department of Nursing, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Kyung Cheon Seo
- Department of Physical Medicine and Rehabilitation, Korea University Anam Hospital, Seoul, Korea
| | - Chang Hwan Ryu
- Department of Otolaryngology-Head and Neck Surgery, Center for Thyroid Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea
| | - Jae-Keun Cho
- Department of Otorhinolaryngology-Head and Neck Surgery, Inje University Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea
| | - Jee-Ho Lee
- Department of Oral and Maxillofacial Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Kyoung Hyo Choi
- Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Vimolratana O, Lackmy-Vallee A, Aneksan B, Hiengkaew V, Klomjai W. Non-linear dose response effect of cathodal transcranial direct current stimulation on muscle strength in young healthy adults: a randomized controlled study. BMC Sports Sci Med Rehabil 2023; 15:10. [PMID: 36717894 PMCID: PMC9887803 DOI: 10.1186/s13102-023-00621-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 01/25/2023] [Indexed: 01/31/2023]
Abstract
BACKGROUND Transcranial direct current stimulation (tDCS) is a technique that modulates brain excitability in humans. Increasing the stimulation intensity or duration within certain limits could enhance tDCS efficacy with a polarity-dependent effect; anodal stimulation increases cortical excitability, whereas cathodal stimulation decreases excitability. However, recent studies have reported a non-linear effect of cathodal tDCS on neuronal excitability in humans, and there is no conclusive result regarding the effect of cathodal tDCS on muscle performance. METHODS Our study aimed to investigate the immediate effects of different intensities (i.e., 1, 1.5, and 2 mA and sham tDCS) of cathodal tDCS on muscle strength in healthy participants. All participants [mean age 23.17 (3.90) years] were recruited and randomly allocated into four groups (1, 1.5, and 2 mA cathodal tDCS and sham tDCS). Muscle strength in bilateral upper and lower extremities was measured before and immediately after tDCS using a handheld dynamometer. RESULTS Our results showed that cathodal tDCS at 1 and 1.5 mA reduced muscle strength bilaterally in upper and lower extremity muscles, whereas stimulation at 2 mA tended to increase muscle strength on the dominant limb. CONCLUSION These findings support the non-linear effects of cathodal tDCS on muscle strength, which should be considered for the clinical use of tDCS in motor rehabilitation. TRIAL REGISTRATION NCT04672122, date of first registration 17/12/2020.
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Affiliation(s)
- Oranich Vimolratana
- grid.10223.320000 0004 1937 0490Neuro Electrical Stimulation Laboratory (NeuE), Faculty of Physical Therapy, Mahidol University, 999 Phutthamonthon 4 Road, Nakhon Pathom, 73170 Thailand ,grid.10223.320000 0004 1937 0490Faculty of Physical Therapy, Mahidol University, 999 Phutthamonthon 4 Road, Nakhon Pathom, 73170 Thailand
| | - Alexandra Lackmy-Vallee
- grid.462844.80000 0001 2308 1657Laboratoire d’Imagerie Biomédicale, LIB, CNRS, INSERM, Sorbonne Université, 75005 Paris, France
| | - Benchaporn Aneksan
- grid.10223.320000 0004 1937 0490Neuro Electrical Stimulation Laboratory (NeuE), Faculty of Physical Therapy, Mahidol University, 999 Phutthamonthon 4 Road, Nakhon Pathom, 73170 Thailand ,grid.10223.320000 0004 1937 0490Faculty of Physical Therapy, Mahidol University, 999 Phutthamonthon 4 Road, Nakhon Pathom, 73170 Thailand
| | - Vimonwan Hiengkaew
- grid.10223.320000 0004 1937 0490Faculty of Physical Therapy, Mahidol University, 999 Phutthamonthon 4 Road, Nakhon Pathom, 73170 Thailand
| | - Wanalee Klomjai
- grid.10223.320000 0004 1937 0490Neuro Electrical Stimulation Laboratory (NeuE), Faculty of Physical Therapy, Mahidol University, 999 Phutthamonthon 4 Road, Nakhon Pathom, 73170 Thailand ,grid.10223.320000 0004 1937 0490Faculty of Physical Therapy, Mahidol University, 999 Phutthamonthon 4 Road, Nakhon Pathom, 73170 Thailand
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11
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Xie J, Zhou C, Ngaruwenayo G, Wu M, Jiang X, Li X. Dosage consideration for transcranial direct current stimulation in post-stroke dysphagia: A systematic review and network meta-analysis. Front Neurol 2023; 14:1098831. [PMID: 36761340 PMCID: PMC9902951 DOI: 10.3389/fneur.2023.1098831] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/04/2023] [Indexed: 01/25/2023] Open
Abstract
Objective This systematic review and network meta-analysis sought to determine the efficacy of different intensities of transcranial direct current stimulation (tDCS) in patients with dysphagia after stroke to improve swallowing function. Methods Randomized-controlled trials (RCTs) of tDCS in post-stroke dysphagia were searched from Pubmed, EMBASE, Cochrane Library, Web of Science, China National Knowledge Infrastructure (CNKI), Chinese Biomedical Literature Service System (SinoMed), Wanfang database, and Chinese Scientific Journals Database (VIP) from databases' inception to June 22, 2022. Article screening, data extraction, and article quality evaluation were completed by 2 independent researchers. Network meta-analysis was performed using Stata. Results A final total of 20 studies involving 838 stroke patients were included. The included control interventions were sham tDCS and conventional therapy (CT). Network meta-analysis showed that 20 min of 1.2, 1.4, 1.5, 1.6, and 2 mA anodal tDCS and 30 min of 2 mA anodal tDCS significantly improved post-stroke dysphagia compared with CT (all P < 0.05). In addition, 20 min of 1, 1.4, 1.6, and 2 mA anodal tDCS also significantly improved post-stroke dysphagia compared with sham tDCS (all P < 0.05). Our results demonstrated that 20 min of stimulation at 1.4 mA was the optimal parameters for anodal tDCS and exhibited superior efficacy to CT [SMD = 1.08, 95% CI (0.46, 1.69)] and sham tDCS [SMD = 1.45, 95% CI (0.54, 2.36)]. Conclusion Different durations and intensities of anodal tDCS are effective in improving post-stroke dysphagia. However, 20 min of tDCS at 1.4 mA may be the optimal regimen. Systematic review registration https://www.crd.york.ac.uk/PROSPERO/#recordDetails, identifier CRD42022342506.
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Affiliation(s)
- Jianwei Xie
- School of Nursing, China Medical University, Shenyang, China
| | - Chiteng Zhou
- School of Nursing, China Medical University, Shenyang, China
| | | | - Minghui Wu
- General Hospital of Pingmei Shenma Group, Pingdingshan, China
| | - Xiaoyu Jiang
- School of Nursing, China Medical University, Shenyang, China
| | - Xiaohan Li
- School of Nursing, China Medical University, Shenyang, China,*Correspondence: Xiaohan Li ✉
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12
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Cheng I, Hamad A, Sasegbon A, Hamdy S. Advances in the Treatment of Dysphagia in Neurological Disorders: A Review of Current Evidence and Future Considerations. Neuropsychiatr Dis Treat 2022; 18:2251-2263. [PMID: 36268265 PMCID: PMC9578488 DOI: 10.2147/ndt.s371624] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 10/08/2022] [Indexed: 11/19/2022] Open
Abstract
Dysphagia, which refers to difficult and/or disordered swallowing, is a common problem associated with various neurological diseases such as stroke, motor neuron diseases and neurodegenerative diseases. Traditionally, dysphagia treatments are either compensatory, which includes modifications of bolus texture or feeding posture, or rehabilitative, which includes behavioral exercises and sensory stimulation. Despite being widely adopted in clinical practice, recent views have challenged the clinical efficacy of these treatments due to the low level of evidence supported by mainly non-controlled studies. As such, with advancements in technology and scientific research methods, recent times have seen a surge in the development of novel dysphagia treatments and an increasing number of robust randomized controlled clinical trials. In this review, we will review the clinical evidence of several newly introduced treatments for dysphagia in the last two decades, including rehabilitative exercises, biofeedback, pharmacological treatments, neuromodulation treatments and soft robotics. Despite the recent improvements in the quality of evidence for the efficacy of dysphagia treatments, several critical issues, including heterogeneity in treatment regimens, long-term treatment effects, underlying mechanisms of some neuromodulation treatments, and the effects of these techniques in non-stroke dysphagia, remain to be addressed in future clinical trials.
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Affiliation(s)
- Ivy Cheng
- Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Centre for Gastrointestinal Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Adeel Hamad
- Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Centre for Gastrointestinal Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Ayodele Sasegbon
- Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Centre for Gastrointestinal Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Shaheen Hamdy
- Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Centre for Gastrointestinal Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
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13
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Griffin L, Kamarunas E, Kuo C, O'Donoghue C. Comparing amplitudes of transcranial direct current stimulation (tDCS) to the sensorimotor cortex during swallowing. Exp Brain Res 2022; 240:1811-1822. [PMID: 35551431 DOI: 10.1007/s00221-022-06381-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] [Received: 11/11/2021] [Accepted: 04/25/2022] [Indexed: 11/04/2022]
Abstract
PURPOSE Transcranial direct current stimulation (tDCS) can alter cortical excitability, making it a useful tool for promoting neuroplasticity in dysphagia rehabilitation. Clinical trials show functional improvements in swallowing following anodal tDCS despite varying dosing parameters and outcomes. The aim of the current study was to determine the most effective amplitude criterion (e.g., 0 mA [sham/control], 1 mA, 2 mA) of anodal tDCS for upregulating the swallowing sensorimotor cortex. METHOD As a novel paradigm, tDCS, functional near-infrared spectroscopy (fNIRS), and surface electromyography (sEMG) were simultaneously administered while participants completed a swallowing task. This allowed for measurement of the cortical hemodynamic response and submental muscle contraction before, during, and after tDCS. At the conclusion of the study, participants were asked to rate their level of discomfort associated with tDCS using a visual analog scale. RESULTS There was no significant difference in the hemodynamic response by time or amplitude. However, post-hoc analyses indicated that in the post-stimulation period, changes to the hemodynamic response in the left (stimulated) hemisphere were significantly different for the groups receiving 1 mA and 2 mA of tDCS compared to baseline. Participants receiving 1 mA of tDCS demonstrated reduced hemodynamic response. There was no significant difference in submental muscle contraction during or after tDCS regardless of amplitude. Anodal tDCS was well tolerated in healthy adults with no difference among participant discomfort scores across tDCS amplitude. CONCLUSIONS During a swallowing task, healthy volunteers receiving 1 mA of anodal tDCS demonstrated a suppressed hemodynamic response during and after stimulation whereas those receiving 2 mA of anodal tDCS had an increase in the hemodynamic response. tDCS remains a promising tool in dysphagia rehabilitation, but dosing parameters require further clarification.
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Affiliation(s)
- Lindsay Griffin
- School of Communication, Communication Sciences and Disorders, Emerson College, 120 Boylston St., Boston, MA, 02116, USA. .,College of Health and Behavioral Studies, Communication Sciences and Disorders, James Madison University, 235 Martin Luther King Jr. Way, Harrisonburg, VA, 22807, USA.
| | - Erin Kamarunas
- College of Health and Behavioral Studies, Communication Sciences and Disorders, James Madison University, 235 Martin Luther King Jr. Way, Harrisonburg, VA, 22807, USA
| | - Christina Kuo
- College of Health and Behavioral Studies, Communication Sciences and Disorders, James Madison University, 235 Martin Luther King Jr. Way, Harrisonburg, VA, 22807, USA
| | - Cynthia O'Donoghue
- College of Health and Behavioral Studies, Communication Sciences and Disorders, James Madison University, 235 Martin Luther King Jr. Way, Harrisonburg, VA, 22807, USA
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Morin M, St-Gelais R, Ketounou KÉ, d'Assomption RML, Ezzaidi H, Fernandes KBP, da Silva RA, Ngomo S. tDCS Task-Oriented Approach Improves Function in Individuals With Fibromyalgia Pain. A Pilot Study. FRONTIERS IN PAIN RESEARCH 2022; 2:692250. [PMID: 35295530 PMCID: PMC8915725 DOI: 10.3389/fpain.2021.692250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 10/28/2021] [Indexed: 11/13/2022] Open
Abstract
Fibromyalgia (FM) is a complex pain syndrome accompanied by physical disability and loss of daily life activities. Evidences suggest that modulation of the primary motor cortex (M1) by transcranial direct current stimulation (tDCS) improves functional physical capacity in chronic pain conditions. However, the gain on physical function in people living with FM receiving tDCS is still unclear. This study aimed to evaluate whether the tDCS task-oriented approach improves function and reduces pain in a single cohort of 10 FM. A total of 10 women with FM (60.4 ± 15.37 years old) were enrolled in an intervention including anodal tDCS delivered on M1 (2 mA from a constant stimulator for 20 min); simultaneously they performed a functional task. The anode was placed on the contralateral hemisphere of the dominant hand. Outcome assessments were done before the stimulation, immediately after stimulation and 30 min after the end of tDCS. The same protocol was applied in subsequent sessions. A total of five consecutive days of tDCS were completed. The main outcomes were the number of repetitions achieved and time in active practice to evaluate functional physical task performance such as intensity of the pain (visual analog scale) and level of fatigue (Borg scale). After 5 days of tDCS, the number of repetitions achieved significantly increased by 49% (p = 0.012). No change was observed in active practice time. No increase in pain was observed despite the mobility of the painful parts of the body. These results are encouraging since an increase in pain due to the mobilization of painful body parts could have been observed at the end of the 5th day of the experiment. These results support the use of tDCS in task-based rehabilitation.
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Affiliation(s)
- Marika Morin
- Laboratoire de recherche Lab BioNR, Physical Therapy Program, Health Sciences Department, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
| | - Raphaël St-Gelais
- École de Réadaptation, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Kossi Épiphane Ketounou
- Laboratoire de recherche Lab BioNR, Physical Therapy Program, Health Sciences Department, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
| | - Régis M-L d'Assomption
- Laboratoire de recherche Lab BioNR, Physical Therapy Program, Health Sciences Department, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
| | - Hassan Ezzaidi
- Department of Applied Sciences, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
| | | | - Rubens A da Silva
- Laboratoire de recherche Lab BioNR, Physical Therapy Program, Health Sciences Department, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
| | - Suzy Ngomo
- Laboratoire de recherche Lab BioNR, Physical Therapy Program, Health Sciences Department, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
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Role of Catechol-O-methyltransferase Val158Met Polymorphism on Transcranial Direct Current Stimulation in Swallowing. J Pers Med 2022; 12:jpm12030488. [PMID: 35330487 PMCID: PMC8949172 DOI: 10.3390/jpm12030488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 03/11/2022] [Accepted: 03/15/2022] [Indexed: 12/13/2022] Open
Abstract
Transcranial direct current stimulation (tDCS) is one of the latest post-stroke dysphagia treatment modalities, and the effect of tDCS is known to be affected by various factors including genetic polymorphisms. However, the role of catechol-O-methyltransferase (COMT) polymorphisms on tDCS in swallowing is unclear. In this prospective pilot study, we aim to explore the effect of tDCS on the swallowing cortex and subsequent swallowing motor function according to COMT polymorphism. Twenty-four healthy participants received either anodal tDCS or sham mode tDCS on the mylohyoid motor cortex at random order, after inhibitory repetitive transcranial magnetic stimulation (rTMS) for preconditioning. The primary outcome was the changes of mylohyoid-motor-evoked potentials (MH-MEP) amplitude in each COMT polymorphism group, from the post-inhibitory rTMS baseline state to immediate, 30, and 60 min after tDCS. The secondary outcomes were the changes in swallowing function. The results showed that COMT Val/Val polymorphism showed improvement across time in the MH-MEP amplitudes and triggering time of swallowing after tDCS, whereas COMT Met carrier group did not show significant changes of MH-MEP or swallowing function across time. This therapeutic response variability of tDCS in the mylohyoid motor system according to COMT polymorphism support the importance of genetic analysis in individualized dysphagia treatment.
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Metaplasticity in the human swallowing system: clinical implications for dysphagia rehabilitation. Neurol Sci 2021; 43:199-209. [PMID: 34654983 PMCID: PMC8724108 DOI: 10.1007/s10072-021-05654-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 10/05/2021] [Indexed: 02/03/2023]
Abstract
Dysphagia is a common and devastating complication following brain damage. Over the last 2 decades, dysphagia treatments have shifted from compensatory to rehabilitative strategies that facilitate neuroplasticity, which is the reorganization of neural networks that is essential for functional recovery. Moreover, there is growing interest in the application of cortical and peripheral neurostimulation to promote such neuroplasticity. Despite some preliminary positive findings, the variability in responsiveness toward these treatments remains substantial. The purpose of this review is to summarize findings on the effects of neurostimulation in promoting neuroplasticity for dysphagia rehabilitation and highlight the need to develop more effective treatment strategies. We then discuss the role of metaplasticity, a homeostatic mechanism of the brain to regulate plasticity changes, in helping to drive neurorehabilitation. Finally, a hypothesis on how metaplasticity could be applied in dysphagia rehabilitation to enhance treatment outcomes is proposed.
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Cheng I, Hamdy S. Current perspectives on the benefits, risks, and limitations of noninvasive brain stimulation (NIBS) for post-stroke dysphagia. Expert Rev Neurother 2021; 21:1135-1146. [PMID: 34530656 DOI: 10.1080/14737175.2021.1974841] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 08/27/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Studies have shown that noninvasive brain stimulation (NIBS), including repetitive transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS), can promote neuroplasticity, which is considered important for functional recovery of swallowing after stroke. Despite extensive studies on NIBS, there remains a gap between research and clinical practice. AREAS COVERED In this article, we update the current knowledge on the benefits and challenges of rTMS and tDCS for post-stroke dysphagia. We identify some key limitations of these techniques that hinder the translation from clinical trials to routine practice. Finally, we discuss the future of NIBS as a treatment for post-stroke dysphagia in real-world settings. EXPERT OPINION Current evidence suggests that rTMS and tDCS show promise as a treatment for post-stroke dysphagia. However, these techniques are limited by the response variability, uncertainty on the safety in patients with comorbidities and difficulties in clinical study designs. Such limitations call for further work to enhance their utility through individualized approaches. Despite this, the last decade has seen a growing acceptance toward these techniques among clinical personnel. As such, we advocate caution but support optimism that NIBS will gradually be recognized as a mainstream treatment approach for post-stroke dysphagia in the future.
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Affiliation(s)
- Ivy Cheng
- Centre for Gastrointestinal Sciences, Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Shaheen Hamdy
- Centre for Gastrointestinal Sciences, Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
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Zhang M, Cheng I, Sasegbon A, Dou Z, Hamdy S. Exploring parameters of gamma transcranial alternating current stimulation (tACS) and full-spectrum transcranial random noise stimulation (tRNS) on human pharyngeal cortical excitability. Neurogastroenterol Motil 2021; 33:e14173. [PMID: 34081376 DOI: 10.1111/nmo.14173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 04/25/2021] [Accepted: 04/28/2021] [Indexed: 02/08/2023]
Abstract
BACKGROUND Transcranial alternating current stimulation (tACS) and transcranial random noise stimulation (tRNS) have been shown to have physiological and functional effects on brain excitability and motor behavior. Yet, little is known about their effects in the swallowing system. AIM To examine the effects and optimal stimulation parameters of tACS and tRNS for modulating excitability of human pharyngeal motor cortex. METHODS 10 Hz (alpha), 20 Hz (beta), 70 Hz (gamma) tACS, 0.1-640 Hz (full-spectrum) tRNS, and sham were applied over pharyngeal motor cortices at 1.5 mA current intensity for 10 min in 15 healthy participants. Pharyngeal motor-evoked and thenar motor-evoked potentials (PMEPs and TMEPs) were assessed before and up to 2 h after stimulation with single-pulse transcranial magnetic stimulation. Averaged MEP amplitude and latency changes were analyzed using repeated measures ANOVA (rmANOVA). KEY RESULTS Two-way rmANOVA across all active interventions demonstrated a significant MEP interaction both in the stimulated pharyngeal cortex (F (4, 56) = 1.731, p = 0.038) and in the ipsilateral thenar cortex (F (4, 56) = 1.506, p = 0.048). Compared to sham, subsequent post hoc tests showed site-specific and sustained (60-120 min) increases in PMEPs with gamma tACS and tRNS (p = 0.005, p = 0.027, respectively) and for TMEPs with beta tACS (p = 0.006). CONCLUSIONS AND INFERENCES Our findings suggest that the effects of tACS and tRNS are frequency-dependent and cortical (representation) site-specific with both gamma tACS and full-spectrum tRNS enhancing human pharyngeal cortical excitability. These techniques hold promise as potential treatments for neurological dysphagia.
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Affiliation(s)
- Mengqing Zhang
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Division of Diabetes, Endocrinology and Gastroenterology, Faculty of Biology, Medicine and Health, Centre for Gastrointestinal Sciences, Clinical Sciences Building, Salford Royal NHS Foundation Trust, School of Medical Sciences, The University of Manchester, Manchester, UK
| | - Ivy Cheng
- Division of Diabetes, Endocrinology and Gastroenterology, Faculty of Biology, Medicine and Health, Centre for Gastrointestinal Sciences, Clinical Sciences Building, Salford Royal NHS Foundation Trust, School of Medical Sciences, The University of Manchester, Manchester, UK
| | - Ayodele Sasegbon
- Division of Diabetes, Endocrinology and Gastroenterology, Faculty of Biology, Medicine and Health, Centre for Gastrointestinal Sciences, Clinical Sciences Building, Salford Royal NHS Foundation Trust, School of Medical Sciences, The University of Manchester, Manchester, UK
| | - Zulin Dou
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Shaheen Hamdy
- Division of Diabetes, Endocrinology and Gastroenterology, Faculty of Biology, Medicine and Health, Centre for Gastrointestinal Sciences, Clinical Sciences Building, Salford Royal NHS Foundation Trust, School of Medical Sciences, The University of Manchester, Manchester, UK
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Sawan SAE, Reda AM, Kamel AH, Ali MAM. Transcranial direct current stimulation (tDCS): its effect on improving dysphagia in stroke patients. THE EGYPTIAN JOURNAL OF NEUROLOGY, PSYCHIATRY AND NEUROSURGERY 2020. [DOI: 10.1186/s41983-020-00246-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Transcranial direct current stimulation (tDCS) may have a potential for improving post-stroke dysphagia.
Objective
The purpose of this study was to examine the effect of tDCS on improving dysphagia in stroke patients.
Patients and methods
Forty stroke patients were divided randomly into two equal groups (the study (group A) and control groups (group B). Group A received a physical therapy program and active (tDCS), and group B received the same physical therapy program and sham (tDCS). The Dysphagia Outcome and Severity Scale (DOSS) and videofluoroscopy were performed in all patients before and after 2 weeks of the treatment program.
Results
Before treatment, there were no significant differences between the two groups for DOSS score or digital fluoroscopic findings. After treatment, there were significant differences between the study and control group for DOSS score and digital fluoroscopic findings.
Conclusion
Anodal tDCS is effective in improving dysphagia in stroke patients.
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20
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Transcranial direct current stimulation for post-stroke dysphagia: a systematic review and meta-analysis of randomized controlled trials. J Neurol 2020; 268:293-304. [PMID: 32797300 DOI: 10.1007/s00415-020-10142-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 08/03/2020] [Accepted: 08/05/2020] [Indexed: 01/25/2023]
Abstract
BACKGROUND Transcranial direct current stimulation (tDCS) has been investigated as a tool for dysphagia recovery after stroke in several single-center randomized controlled trials (RCT). OBJECTIVE The aim of this investigation was to quantitatively evaluate the effect of tDCS on dysphagia recovery after a stroke utilizing a systematic review and meta-analysis. METHODS Major databases were searched through October 2019 using a pre-defined set of criteria. Any RCT investigating the efficacy of tDCS in post-stroke dysphagia using a standardized dysphagia scale as outcome measure was included. Studies were assessed for risk of bias and quality using the Physiotherapy Evidence Database (PEDro) scale. Effect sizes were calculated from extracted data and entered into a random effects analysis to obtain pooled estimates of the effect. RESULTS Seven RCTs with a total sample size of 217 patients fulfilled the criteria and were included in the analysis. The overall results revealed a small but statistically significant pooled effect size (0.31; CI 0.03, 0.59; p = 0.03). The subgroup which explored the stimulation intensity yielded a moderately significant effect size for the low-intensity stimulation group (g = 0.44; CI = 0.08, 0.81 vs. g = 0.15, CI - 0.30, 0.61). For the other subgroup analyses, neither comparisons of affected vs. unaffected hemisphere or acute vs. chronic stroke phase revealed a significant result. CONCLUSION This meta-analysis demonstrates a modest but significant beneficial effect of tDCS on improving post-stroke dysphagia. Whether benefits from this intervention are more pronounced in certain patient subgroups and with specific stimulation protocols requires further investigation.
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21
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Amaral MS, Furlan RMMM, de Las Casas EB, Motta AR. The influence of tongue mobility on children's performance in computer games that depend on lingual movements. J Oral Rehabil 2020; 47:1233-1241. [PMID: 33464606 DOI: 10.1111/joor.13050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 06/01/2020] [Accepted: 06/23/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND Alteration in tongue mobility requires rehabilitation work through oral motor exercises. These exercises can be integrated with computer games to increase the patient's motivation during treatment. OBJECTIVE To investigate the influence of tongue mobility on children's motor performance in a computer game reliant on lingual movements. METHODS A cross-sectional descriptive observational study was carried out with 16 children with altered tongue mobility and 16 children with normal tongue mobility. The subjects were between 8 and 12 years of age. They underwent a clinical evaluation of the tongue and performed an activity using an intra-oral joystick controlled by the tongue to play a simple computer game. The game consisted of targets appearing on the screen that the participants had to reach by moving the joystick control rod. Afterward, the participants answered a feedback questionnaire. Motor performance in the game, measured by the number of reached targets and by the time to reach the targets, was compared between groups and across directions of tongue movement and order of appearance of the targets. RESULTS The group with altered tongue mobility presented a higher time to reach the target in the downward direction and in the first and last 12 targets and a lower number of targets reached in the left direction, upward direction, and in the first 12 targets than the control group. The direction of the movement influenced tongue performance in both groups. CONCLUSION Children with altered tongue mobility exhibited a worse performance than those with normal tongue mobility.
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Affiliation(s)
- Mariana S Amaral
- Graduate Program in Speech Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Renata M M M Furlan
- Department of Speech Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Estevam B de Las Casas
- Department of Structural Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Andréa R Motta
- Department of Speech Language Pathology and Audiology, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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22
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Cosentino G, Tassorelli C, Prunetti P, Bertino G, De Icco R, Todisco M, Di Marco S, Brighina F, Schindler A, Rondanelli M, Fresia M, Mainardi L, Restivo DA, Priori A, Sandrini G, Alfonsi E. Anodal transcranial direct current stimulation and intermittent theta-burst stimulation improve deglutition and swallowing reproducibility in elderly patients with dysphagia. Neurogastroenterol Motil 2020; 32:e13791. [PMID: 31975493 DOI: 10.1111/nmo.13791] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 11/24/2019] [Accepted: 12/13/2019] [Indexed: 02/08/2023]
Abstract
BACKGROUND Dysphagia in the elderly, known as presbydysphagia, has become a relevant public health problem in several countries. Swallowing disorders may be a consequence of different neurological disorders (secondary presbydysphagia) or the expression of the aging process itself (primary presbydysphagia). We aimed to test the therapeutic potential of two different non-invasive brain stimulation (NIBS) techniques in subjects with primary or secondary presbydysphagia. METHODS A blinded randomized controlled trial with crossover design was carried out in 42 patients, randomly assigned to anodal transcranial direct current stimulation (tDCS) or intermittent theta-burst stimulation (TBS) group. Both tDCS and TBS were applied for 5 consecutive days over the right swallowing motor cortex. The swallowing function was assessed before and 1 and 3 months after the stimulation using the Dysphagia Outcome and Severity Scale (DOSS), scored based on clinical assessment and fiberoptic endoscopic evaluation of swallowing. An electrophysiological method was also applied to evaluate changes in the reproducibility of the swallowing behavior. KEY RESULTS Both real tDCS and TBS had beneficial effects on the swallowing function in patients with primary and secondary presbydysphagia. Anodal tDCS resulted in an improvement of 0.5 points in DOSS at 1-month follow-up (P = .014), whereas intermittent TBS induced an increase of 0.7 and 0.6 points at 1- and 3-month follow-up evaluations, respectively (P = .0001 and P = .005, respectively). Reproducibility of both the oral and pharyngeal phases of swallowing significantly increased at 1-month follow-up. CONCLUSIONS AND INFERENCES Our results suggest that non-invasive cortical stimulation may be useful for dysphagia recovery in elderly patients.
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Affiliation(s)
- Giuseppe Cosentino
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy.,Clinical Neurophysiology Unit, IRCCS Mondino Foundation, Pavia, Italy
| | - Cristina Tassorelli
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy.,Neurorehabilitation Unit, IRCCS Mondino Foundation, Pavia, Italy
| | - Paolo Prunetti
- Clinical Neurophysiology Unit, IRCCS Mondino Foundation, Pavia, Italy
| | - Giulia Bertino
- Department of Otolaryngology, University of Pavia, IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
| | - Roberto De Icco
- Neurorehabilitation Unit, IRCCS Mondino Foundation, Pavia, Italy
| | | | - Salvatore Di Marco
- Department of Biomedicine Neuroscience and Advanced Diagnostics, University of Palermo, Palermo, Italy
| | - Filippo Brighina
- Department of Biomedicine Neuroscience and Advanced Diagnostics, University of Palermo, Palermo, Italy
| | - Antonio Schindler
- Department of Clinical Sciences "Luigi Sacco", University of Milan, Milan, Italy
| | - Mariangela Rondanelli
- Section of Human Nutrition and Dietetics, Department of Public Health and Experimental and Forensic Medicine, University of Pavia, Pavia, Italy
| | - Mauro Fresia
- Clinical Neurophysiology Unit, IRCCS Mondino Foundation, Pavia, Italy
| | - Luca Mainardi
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milan, Italy
| | | | - Alberto Priori
- Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, University of Milan, Milan, Italy
| | - Giorgio Sandrini
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Enrico Alfonsi
- Clinical Neurophysiology Unit, IRCCS Mondino Foundation, Pavia, Italy
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23
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Maezawa H, Vicario CM, Kuo MF, Hirata M, Mima T, Nitsche MA. Effects of bilateral anodal transcranial direct current stimulation over the tongue primary motor cortex on cortical excitability of the tongue and tongue motor functions. Brain Stimul 2019; 13:270-272. [PMID: 31628077 DOI: 10.1016/j.brs.2019.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 10/04/2019] [Accepted: 10/06/2019] [Indexed: 10/25/2022] Open
Affiliation(s)
- Hitoshi Maezawa
- Department of Psychology and Neurosciences, Leibniz Research Center for Working Environment and Human Factors, Ardeystr. 67, 44139, Dortmund, Germany; Department of Oral Physiology, Graduate School of Dental Medicine, Hokkaido University, Kita-ku, Sapporo, 060-8586, Japan; Department of Neurological Diagnosis and Restoration, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka, 565-0871, Japan.
| | - Carmelo Mario Vicario
- Department of Psychology and Neurosciences, Leibniz Research Center for Working Environment and Human Factors, Ardeystr. 67, 44139, Dortmund, Germany; Department of Scienze Cognitive, Psycologiche, Pedagogiche e Degli Studi Culturali, University of Messina, 98121, Messina, ME, Italy
| | - Min-Fang Kuo
- Department of Psychology and Neurosciences, Leibniz Research Center for Working Environment and Human Factors, Ardeystr. 67, 44139, Dortmund, Germany
| | - Masayuki Hirata
- Department of Neurological Diagnosis and Restoration, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka, 565-0871, Japan
| | - Tatsuya Mima
- Graduate School of Core Ethics and Frontier Sciences, Ritsumeikan University, Kita-ku, Kyoto, 603-8577, Japan
| | - Michael A Nitsche
- Department of Psychology and Neurosciences, Leibniz Research Center for Working Environment and Human Factors, Ardeystr. 67, 44139, Dortmund, Germany; Department of Neurology, University Medical Hospital Bergmannsheil, Bürkle de La Camp-Platz 1, 44789, Bochum, Germany
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24
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Restivo DA, Alfonsi E, Casabona A, Hamdy S, Tassorelli C, Panebianco M, Marchese-Ragona R, Quartarone A, Centonze D, Pavone A, Stampanoni Bassi M. A pilot study on the efficacy of transcranial direct current stimulation applied to the pharyngeal motor cortex for dysphagia associated with brainstem involvement in multiple sclerosis. Clin Neurophysiol 2019; 130:1017-1024. [PMID: 31009904 DOI: 10.1016/j.clinph.2019.04.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 03/14/2019] [Accepted: 04/02/2019] [Indexed: 01/29/2023]
Abstract
OBJECTIVE we investigated the effect of anodal transcranial direct current stimulation (tDCS) applied over the pharyngeal motor area in dysphagia associated with multiple sclerosis (MS). METHODS Eighteen MS patients with dysphagia associated with brainstem involvement were randomized to receive either "real" or "sham" tDCS. PRIMARY OUTCOME The Penetration/Aspiration Scale (PAS). SECONDARY OUTCOMES changes in electromyographic (EMG) parameters and pharyngeal cortical motor evoked potentials (MEPs). Patients were evaluated at baseline (T0), at the end of 5-session cycle of tDCS stimulations (T1), after two (T2), and four (T3) weeks. RESULTS the PAS values were significantly lower in the active group than in "sham" group at T1, and at T3. Over the post-stimulation periods, PAS significantly improved only in the "real" group. As regards the secondary outcomes, we observed a statistically significant difference between the 2 groups only in the MEPs amplitude at T1. The comparison between baseline and each of the post-stimulation times showed significant differences only of the "real" group across all the secondary parameters. CONCLUSIONS Our findings support a beneficial effect of anodal tDCS applied to the pharyngeal motor cortex in MS-associated dysphagia. SIGNIFICANCE Considering its safety and efficacy, tDCS may represent an important resource in MS-associated dysphagia.
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Affiliation(s)
| | - Enrico Alfonsi
- Neurophysiological Unit, IRCCS "Fondazione Casimiro Mondino", Pavia, Italy
| | - Antonino Casabona
- Department of Biomedical and Biotechnological Sciences, Section of Physiology, University of Catania, Catania, Italy
| | - Shaheen Hamdy
- School of Translational Medicine-Inflammation Sciences, Faculty of Medical and Human Sciences, University of Manchester (part of the Manchester Academic Health Sciences Centre MAHSC), Salford Royal Hospital, Eccles Old Road, Salford M6 8HD, UK
| | | | - Mariangela Panebianco
- Neurological Unit, "Garibaldi" Hospital, Catania, Italy; Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Clinical Sciences Centre for Research and Education, Lower Lane, L9 7LJ Liverpool, UK
| | | | - Angelo Quartarone
- IRCCS Centro Neurolesi "Bonibo-Pulejo", via Provinciale Palermo, Contrada Casazza 95124, Messina, Italy
| | - Diego Centonze
- Laboratory of Synaptic Immunopathology, Department of Systems Medicine, Tor Vergata University, Via Montpellier 1, 00133 Rome, Italy; Unit of Neurology and Neurorehabilitation, IRCCS Neuromed, Via Atinense 18, 86077 Pozzilli, IS, Italy
| | | | - Mario Stampanoni Bassi
- Unit of Neurology and Neurorehabilitation, IRCCS Neuromed, Via Atinense 18, 86077 Pozzilli, IS, Italy
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Neurophysiological Adaptation and Neuromodulatory Treatment Approaches in Patients Suffering from Post-stroke Dysphagia. CURRENT PHYSICAL MEDICINE AND REHABILITATION REPORTS 2018. [DOI: 10.1007/s40141-018-0201-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Doeltgen SH, Rigney L, Cock C, Omari T. Effects of cortical anodal transcranial direct current stimulation on swallowing biomechanics. Neurogastroenterol Motil 2018; 30:e13434. [PMID: 30101445 DOI: 10.1111/nmo.13434] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 06/27/2018] [Accepted: 06/28/2018] [Indexed: 02/08/2023]
Abstract
BACKGROUND Anodal transcranial direct current stimulation (tDCS) has demonstrated effects on corticobulbar excitability and swallowing function as assessed via clinical rating scales in stroke cohorts. Biomechanical effects of anodal tDCS on swallowing remain largely unexplored. We investigated how anodal tDCS applied over the floor of mouth (FOM) representation on the primary motor cortex affects swallowing biomechanics in healthy participants. METHODS Anodal and sham tDCS were applied for 20 minutes at 1.5 mA. Corticobulbar excitability was assessed using motor evoked potentials at baseline and 0, 15, 30 and 45 minutes post-tDCS, as assessed by transcranial magnetic stimulation. Swallowing function was assessed pre- and post-tDCS using routine clinical assessments (Study 1) and pharyngeal high resolution impedance manometry (Study 2). KEY RESULTS Study 1 (n = 17) showed increased corticobulbar excitability and performance on a skilled swallowing task following anodal wetDCS, but not sham tDCS. In Study 2 (n = 10) anodal tDCS resulted in increased bolus admittance across the upper esophageal sphincter, but decreased pharyngeal and upper esophageal contractile vigor. CONCLUSIONS Clinical improvements of dietary intake are likely driven by swallowing neuroplastic reorganization which improves bolus admittance across the upper esophageal sphincter (UES). INFERENCES The documented changes make motor cortical application of anodal tDCS a promising adjunct to swallowing rehabilitation practice.
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Affiliation(s)
- Sebastian H Doeltgen
- Speech Pathology, Swallowing Neurorehabilitation Research Laboratory, College of Nursing and Health Sciences, Flinders University, Bedford Park, SA, Australia.,Centre for Neuroscience, College of Medicine and Public Health, Flinders University, Bedford Park, SA, Australia
| | - Lakkari Rigney
- Speech Pathology, Swallowing Neurorehabilitation Research Laboratory, College of Nursing and Health Sciences, Flinders University, Bedford Park, SA, Australia
| | - Charles Cock
- Gastroenterology, College of Medicine and Public Health, Flinders University, Bedford Park, SA, Australia
| | - Taher Omari
- Centre for Neuroscience, College of Medicine and Public Health, Flinders University, Bedford Park, SA, Australia.,Human Physiology, College of Medicine and Public Health, Flinders University, Bedford Park, SA, Australia
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27
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Cosentino G, Gargano R, Bonura G, Realmuto S, Tocco E, Ragonese P, Gangitano M, Alfonsi E, Fierro B, Brighina F, Salemi G. Anodal tDCS of the swallowing motor cortex for treatment of dysphagia in multiple sclerosis: a pilot open-label study. Neurol Sci 2018; 39:1471-1473. [DOI: 10.1007/s10072-018-3443-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 05/08/2018] [Indexed: 11/29/2022]
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28
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Suntrup-Krueger S, Ringmaier C, Muhle P, Wollbrink A, Kemmling A, Hanning U, Claus I, Warnecke T, Teismann I, Pantev C, Dziewas R. Randomized trial of transcranial direct current stimulation for poststroke dysphagia. Ann Neurol 2018; 83:328-340. [PMID: 29350775 DOI: 10.1002/ana.25151] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 01/16/2018] [Accepted: 01/17/2018] [Indexed: 11/12/2022]
Abstract
OBJECTIVE We evaluated whether transcranial direct current stimulation (tDCS) is able to enhance dysphagia rehabilitation following stroke. Besides relating clinical effects with neuroplastic changes in cortical swallowing processing, we aimed to identify factors influencing treatment success. METHODS In this double-blind, randomized study, 60 acute dysphagic stroke patients received contralesional anodal (1mA, 20 minutes) or sham tDCS on 4 consecutive days. Swallowing function was thoroughly assessed before and after the intervention using the validated Fiberoptic Endoscopic Dysphagia Severity Scale (FEDSS) and clinical assessment. In 10 patients, swallowing-related brain activation was recorded applying magnetoencephalography before and after the intervention. Voxel-based statistical lesion pattern analysis was also performed. RESULTS Study groups did not differ according to demographic data, stroke characteristics, or baseline dysphagia severity. Patients treated with tDCS showed greater improvement in FEDSS than the sham group (1.3 vs 0.4 points, mean difference = 0.9, 95% confidence interval [CI] = 0.4-1.4, p < 0.0005). Functional recovery was accompanied by a significant increase of activation (p < 0.05) in the contralesional swallowing network after real but not sham tDCS. Regarding predictors of treatment success, for every hour earlier that treatment was initiated, there was greater improvement on the FEDSS (adjusted odds ratio = 0.99, 95% CI = 0.98-1.00, p < 0.05) in multivariate analysis. Stroke location in the right insula and operculum was indicative of worse response to tDCS (p < 0.05). INTERPRETATION Application of tDCS over the contralesional swallowing motor cortex supports swallowing network reorganization, thereby leading to faster rehabilitation of acute poststroke dysphagia. Early treatment initiation seems beneficial. tDCS may be less effective in right-hemispheric insulo-opercular stroke. Ann Neurol 2018;83:328-340.
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Affiliation(s)
- Sonja Suntrup-Krueger
- Department of Neurology, University Hospital Münster, Albert Schweitzer Campus 1 Münster.,Institute for Biomagnetism and Biosignal Analysis, University Hospital Münster, Münster
| | | | - Paul Muhle
- Department of Neurology, University Hospital Münster, Albert Schweitzer Campus 1 Münster.,Institute for Biomagnetism and Biosignal Analysis, University Hospital Münster, Münster
| | - Andreas Wollbrink
- Institute for Biomagnetism and Biosignal Analysis, University Hospital Münster, Münster
| | - Andre Kemmling
- Institute of Neuroradiology, University Hospital Lübeck, Lübeck
| | - Uta Hanning
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg
| | - Inga Claus
- Department of Neurology, University Hospital Münster, Albert Schweitzer Campus 1 Münster
| | - Tobias Warnecke
- Department of Neurology, University Hospital Münster, Albert Schweitzer Campus 1 Münster
| | - Inga Teismann
- Department of Neurology, University Hospital Münster, Albert Schweitzer Campus 1 Münster
| | - Christo Pantev
- Institute for Biomagnetism and Biosignal Analysis, University Hospital Münster, Münster
| | - Rainer Dziewas
- Department of Neurology, University Hospital Münster, Albert Schweitzer Campus 1 Münster
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29
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Direct and Indirect Therapy: Neurostimulation for the Treatment of Dysphagia After Stroke. Dysphagia 2018. [DOI: 10.1007/174_2017_147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Kothari M, Stubbs PW, Figlewski K, Pedersen AR, Jensen J, Baad-Hansen L, Svensson P, Nielsen JF. Effect of transcranial direct current stimulation on neuroplasticity in corticomotor pathways of the tongue muscles. J Oral Rehabil 2017; 44:691-701. [DOI: 10.1111/joor.12529] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2017] [Indexed: 11/29/2022]
Affiliation(s)
- M. Kothari
- Hammel Neurorehabilitation Centre and University Research Clinic; Aarhus University; Hammel Denmark
| | - P. W. Stubbs
- Hammel Neurorehabilitation Centre and University Research Clinic; Aarhus University; Hammel Denmark
| | - K. Figlewski
- Hammel Neurorehabilitation Centre and University Research Clinic; Aarhus University; Hammel Denmark
| | - A. R. Pedersen
- Hammel Neurorehabilitation Centre and University Research Clinic; Aarhus University; Hammel Denmark
| | - J. Jensen
- Hammel Neurorehabilitation Centre and University Research Clinic; Aarhus University; Hammel Denmark
| | - L. Baad-Hansen
- Section of Orofacial Pain and Jaw Function, Department of Odontology and Oral Health; Aarhus University; Hammel
- Scandinavian Center for Orofacial Neurosciences (SCON); Aarhus Denmark
| | - P. Svensson
- Section of Orofacial Pain and Jaw Function, Department of Odontology and Oral Health; Aarhus University; Hammel
- Scandinavian Center for Orofacial Neurosciences (SCON); Aarhus Denmark
- Department of Dental Medicine; Karolinska Institutet; Huddinge Sweden
| | - J. F. Nielsen
- Hammel Neurorehabilitation Centre and University Research Clinic; Aarhus University; Hammel Denmark
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Yuan Y, Wang J, Wu D, Huang X, Song W. Effect of transcranial direct current stimulation on swallowing apraxia and cortical excitability in stroke patients. Top Stroke Rehabil 2017; 24:503-509. [PMID: 28476095 DOI: 10.1080/10749357.2017.1322250] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Swallowing apraxia is characterized by impaired volitional swallowing but relatively preserved reflexive swallowing. Few studies are available on the effectiveness of behavioral therapy and management of the condition. OBJECTIVE This study aimed to investigate the effect of transcranial direct current stimulation (tDCS) on swallowing apraxia and cortical activation in stroke patients. METHODS The study included three inpatients (age 48-70 years; 1 male, 2 females; duration of stroke, 35-55 d) with post-stroke swallowing apraxia and six age-matched healthy subjects (age 45-65 years; 3 males, 3 females). Treatments were divided into two phases: Phase A and Phase B. During Phase A, the inpatients received three weeks of sham tDCS and conventional treatments. During Phase B, these patients received three weeks of anodal tDCS over the bilateral primary sensorimotor cortex (S1M1) of swallowing and conventional treatments. Swallowing apraxia assessments were measured in three inpatients before Phase A, before Phase B, and after Phase B. The electroencephalography (EEG) nonlinear index of approximate entropy (ApEn) was calculated for three patients and six healthy subjects. RESULTS After tDCS, scores of swallowing apraxia assessments increased, and ApEn indices increased in both stimulated and non-stimulated areas. CONCLUSIONS Anodal tDCS might provide a useful means for recovering swallowing apraxia, and the recovery could be related to increased excitability of the swallowing cortex. Further investigations should explore the relationship between lesion size and/or lesion site and the prognosis of swallowing apraxia. Clinical trial registry: http://www.chictr.org Registration Number: ChiCTR-TRC-14004955.
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Affiliation(s)
- Ying Yuan
- a Department of Rehabilitation , Xuanwu Hospital Capital Medical University , Beijing , China
| | - Jie Wang
- a Department of Rehabilitation , Xuanwu Hospital Capital Medical University , Beijing , China
| | - Dongyu Wu
- b Department of Rehabilitation , Wangjing Hospital of China Academy of Chinese Medical Science, Wangjing Hospital , Beijing , China
| | - Xiaobo Huang
- c Department of Traditional Chinese Medicine , Xuanwu Hospital Capital Medical University , Beijing , China
| | - Weiqun Song
- a Department of Rehabilitation , Xuanwu Hospital Capital Medical University , Beijing , China
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Abstract
Dysphagia is common sequela of brain injury with as many as 50% of patients suffering from dysphagia following stroke. Currently, the majority of guidelines for clinical practice in the management of dysphagia focus on the prevention of complications while any natural recovery takes place. Recently, however, non-invasive brain stimulation (NIBS) techniques like transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS) have started to attract attention and are applied to investigate both the physiology of swallowing and influences on dysphagia. TMS allows for painless stimulation of the brain through an intact skull—an effect which would normally be impossible with electrical currents due to the high resistance of the skull. By comparison, tDCS involves passing a small electric current (usually under 2 mA) produced by a current generator over the scalp and cranium external to the brain. Initial studies used these techniques to better understand the physiological mechanisms of swallowing in healthy subjects. More recently, a number of studies have investigated the efficacy of these techniques in the management of neurogenic dysphagia with mixed results. Controversy still exists as to which site, strength and duration of stimulation yields the greatest improvement in dysphagia. And while multiple studies have suggested promising effects of NIBS, more randomised control trials with larger sample sizes are needed to investigate the short- and long-term effects of NIBS in neurogenic dysphagia.
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33
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Application of noninvasive brain stimulation for post-stroke dysphagia rehabilitation. Kaohsiung J Med Sci 2017; 33:55-61. [DOI: 10.1016/j.kjms.2016.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/20/2016] [Accepted: 11/09/2016] [Indexed: 11/15/2022] Open
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34
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Manoli Z, Parazzini M, Ravazzani P, Samaras T. The electric field distributions in anatomical head models during transcranial direct current stimulation for post-stroke rehabilitation. Med Phys 2017; 44:262-271. [DOI: 10.1002/mp.12006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 11/01/2016] [Accepted: 11/12/2016] [Indexed: 11/10/2022] Open
Affiliation(s)
- Zoi Manoli
- Department of Physics; Aristotle University of Thessaloniki; Thessaloniki 54124 Greece
- THESS S.A.; Thessaloniki 57001 Greece
| | - Marta Parazzini
- National Research Council (CNR); Institute of Electronics; Computer and Telecommunication Engineering; Milano 20133 Italy
| | - Paolo Ravazzani
- National Research Council (CNR); Institute of Electronics; Computer and Telecommunication Engineering; Milano 20133 Italy
| | - Theodoros Samaras
- Department of Physics; Aristotle University of Thessaloniki; Thessaloniki 54124 Greece
- Department of Physics; University of Malta; Msida MSD 2080 Malta
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Karuza EA, Balewski ZZ, Hamilton RH, Medaglia JD, Tardiff N, Thompson-Schill SL. Mapping the Parameter Space of tDCS and Cognitive Control via Manipulation of Current Polarity and Intensity. Front Hum Neurosci 2016; 10:665. [PMID: 28082886 PMCID: PMC5187365 DOI: 10.3389/fnhum.2016.00665] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 12/14/2016] [Indexed: 11/18/2022] Open
Abstract
In the cognitive domain, enormous variation in methodological approach prompts questions about the generalizability of behavioral findings obtained from studies of transcranial direct current stimulation (tDCS). To determine the impact of common variations in approach, we systematically manipulated two key stimulation parameters—current polarity and intensity—and assessed their impact on a task of inhibitory control (the Eriksen Flanker). Ninety participants were randomly assigned to one of nine experimental groups: three stimulation conditions (anode, sham, cathode) crossed with three intensity levels (1.0, 1.5, 2.0 mA). As participants performed the Flanker task, stimulation was applied over left dorsolateral prefrontal cortex (DLPFC; electrode montage: F3-RSO). The behavioral impact of these manipulations was examined using mixed effects linear regression. Results indicate a significant effect of stimulation condition (current polarity) on the magnitude of the interference effect during the Flanker; however, this effect was specific to the comparison between anodal and sham stimulation. Inhibitory control was therefore improved by anodal stimulation over the DLPFC. In the present experimental context, no reliable effect of stimulation intensity was observed, and we found no evidence that inhibitory control was impeded by cathodal stimulation. Continued exploration of the stimulation parameter space, particularly with more robustly powered sample sizes, is essential to facilitating cross-study comparison and ultimately working toward a reliable model of tDCS effects.
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Affiliation(s)
- Elisabeth A Karuza
- Department of Psychology, University of Pennsylvania, Philadelphia PA, USA
| | - Zuzanna Z Balewski
- Department of Psychology, University of Pennsylvania, Philadelphia PA, USA
| | - Roy H Hamilton
- Department of Neurology, University of Pennsylvania, Philadelphia PA, USA
| | - John D Medaglia
- Department of Psychology, University of Pennsylvania, Philadelphia PA, USA
| | - Nathan Tardiff
- Department of Psychology, University of Pennsylvania, Philadelphia PA, USA
| | - Sharon L Thompson-Schill
- Department of Psychology, University of Pennsylvania, PhiladelphiaPA, USA; Department of Neurology, University of Pennsylvania, PhiladelphiaPA, USA
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Horvath JC, Carter O, Forte JD. No significant effect of transcranial direct current stimulation (tDCS) found on simple motor reaction time comparing 15 different simulation protocols. Neuropsychologia 2016; 91:544-552. [PMID: 27664296 DOI: 10.1016/j.neuropsychologia.2016.09.017] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Revised: 08/05/2016] [Accepted: 09/20/2016] [Indexed: 11/25/2022]
Abstract
BACKGROUND Research exploring the behavioral impact of transcranial direct current stimulation (tDCS) over M1 has produced homogenous results. The most common explanations to address this homogeneity concerns the differential impact of varied tDCS parameters (such as stimulation intensity or electrode montage). To explore this, we systematically examined the effects of 15 different tDCS protocols on a well-elucidated neurobehavioral system: simple visual motor reaction time (smRT). METHODS For the initial phase of this study, 150 healthy participants were randomly assigned to one of 5 experimental groups (2mA anodal, 2mA cathodal, 1mA anodal, 1mA cathodal, or sham) across 3 different conditions (orbitofrontal, bilateral, or extracephalic reference electrode location). The active electrode was always placed over M1 and tDCS lasted for 20min. Starting ~5min prior to stimulation and running continuously for ~30min, participants were repeatedly presented with a visual cue centered on a computer monitor and asked to press a response button as quickly as possible at stimulus onset (stimuli number: 100 pre-, 400 during-, and 100-post stimulation - interstimulus interval: 1-3s). Ex-gaussian distribution curves, miss, and error rates were determined for each normalized batch of 100 RTs and compared using a two-way ANOVA. As the largest group differences were seen with 2mA anodal (compared to sham) stimulation using an orbitofrontal montage, an additional 60 healthy participants were recruited to further test for significance in this condition. RESULTS No significant impact of tDCS was seen on any parameter of smRT distribution, error rate, or miss rate, regardless of polarity, stimulation intensity, electrode montage, or stimulation-to-task relationship. CONCLUSION Our results suggest that tDCS over M1 might not have a predictable or reliable effect on short duration smRT. Our results raise interesting questions regarding the mechanisms by which tDCS might modulate more complex motor behaviors. Additional research utilizing multiple tDCS protocols as undertaken here will help address and clarify these concerns.
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Affiliation(s)
- Jared Cooney Horvath
- University of Melbourne, School of Psychological Sciences, Melbourne, VIC, Australia.
| | - Olivia Carter
- University of Melbourne, School of Psychological Sciences, Melbourne, VIC, Australia
| | - Jason D Forte
- University of Melbourne, School of Psychological Sciences, Melbourne, VIC, Australia
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Wirth R, Dziewas R, Beck AM, Clavé P, Hamdy S, Heppner HJ, Langmore S, Leischker AH, Martino R, Pluschinski P, Rösler A, Shaker R, Warnecke T, Sieber CC, Volkert D. Oropharyngeal dysphagia in older persons - from pathophysiology to adequate intervention: a review and summary of an international expert meeting. Clin Interv Aging 2016; 11:189-208. [PMID: 26966356 PMCID: PMC4770066 DOI: 10.2147/cia.s97481] [Citation(s) in RCA: 273] [Impact Index Per Article: 34.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Oropharyngeal dysphagia (OD) is a highly prevalent and growing condition in the older population. Although OD may cause very severe complications, it is often not detected, explored, and treated. Older patients are frequently unaware of their swallowing dysfunction which is one of the reasons why the consequences of OD, ie, aspiration, dehydration, and malnutrition, are regularly not attributed to dysphagia. Older patients are particularly vulnerable to dysphagia because multiple age-related changes increase the risk of dysphagia. Physicians in charge of older patients should be aware that malnutrition, dehydration, and pneumonia are frequently caused by (unrecognized) dysphagia. The diagnosis is particularly difficult in the case of silent aspiration. In addition to numerous screening tools, videofluoroscopy was the traditional gold standard of diagnosing OD. Recently, the fiberoptic endoscopic evaluation of swallowing is increasingly utilized because it has several advantages. Besides making a diagnosis, fiberoptic endoscopic evaluation of swallowing is applied to evaluate the effectiveness of therapeutic maneuvers and texture modification of food and liquids. In addition to swallowing training and nutritional interventions, newer rehabilitation approaches of stimulation techniques are showing promise and may significantly impact future treatment strategies.
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Affiliation(s)
- Rainer Wirth
- Department for Internal Medicine and Geriatrics, St Marien-Hospital Borken, Borken, Germany; Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
| | - Rainer Dziewas
- Department of Neurology, University Hospital Münster, Münster, Germany
| | - Anne Marie Beck
- Department of Nutrition and Health, Faculty of Health and Technology, Metropolitan University College, Copenhagen, Denmark
| | - Pere Clavé
- Centro de Investigación Biomédica en Red de enfermadades Hepáticas y Digestivas (CIBERehd), Hospital de Mataró, Universitat Autònoma de Barcelona, Mataró, Spain
| | - Shaheen Hamdy
- Centre for Gastrointestinal Sciences, Institute of Inflammation and Repair, University of Manchester, Salford Royal Hospital, Salford, UK
| | - Hans Juergen Heppner
- Department of Geriatrics, Witten- Herdecke University, Schwelm, Germany; Helios Clinic Schwelm, Schwelm, Germany
| | - Susan Langmore
- Department of Speech, Language and Hearing Sciences, Boston University School of Medicine, Boston, MA, USA
| | | | - Rosemary Martino
- Department of Speech-Language Pathology, University of Toronto, Toronto, Canada
| | - Petra Pluschinski
- Department of Phoniatrics and Pediatric Audiology, University of Marburg, Marburg, Germany
| | - Alexander Rösler
- Department of Geriatrics, Marien Hospital Hamburg, Hamburg, Germany
| | - Reza Shaker
- Division of Gastroenterology and Hepatology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Tobias Warnecke
- Department of Neurology, University Hospital Münster, Münster, Germany
| | - Cornel Christian Sieber
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany; Department of General Internal Medicine and Geriatrics, St John of God Hospital Regensburg, Regensburg, Germany
| | - Dorothee Volkert
- Institute for Biomedicine of Aging, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nürnberg, Germany
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Zhao S, Dou Z, Wei X, Li J, Dai M, Wang Y, Yang Q, He H. Task-concurrent anodal tDCS modulates bilateral plasticity in the human suprahyoid motor cortex. Front Hum Neurosci 2015; 9:370. [PMID: 26157383 PMCID: PMC4478379 DOI: 10.3389/fnhum.2015.00370] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 06/11/2015] [Indexed: 12/11/2022] Open
Abstract
Transcranial direct current stimulation (tDCS) is a non-invasive method to modulate cortical excitability in humans. Here, we examined the effects of anodal tDCS on suprahyoid motor evoked potentials (MEP) when applied over the hemisphere with stronger and weaker suprahyoid/submental projections, respectively, while study participants performed a swallowing task. Thirty healthy volunteers were invited to two experimental sessions and randomly assigned to one of two different groups. While in the first group stimulation was targeted over the hemisphere with stronger suprahyoid projections, the second group received stimulation over the weaker suprahyoid projections. tDCS was applied either as anodal or sham stimulation in a random cross-over design. Suprahyoid MEPs were assessed immediately before intervention, as well as 5, 30, 60, and 90 min after discontinuation of stimulation from both the stimulated and non-stimulated contralateral hemisphere. We found that anodal tDCS (a-tDCS) had long-lasting effects on suprahyoid MEPs on the stimulated side in both groups (tDCS targeting the stronger projections: F(1,14) = 96.2, p < 0.001; tDCS targeting the weaker projections: F(1,14) = 37.45, p < 0.001). While MEPs did not increase when elicited from the non-targeted hemisphere after stimulation of the stronger projections (F(1,14) = 0.69, p = 0.42), we found increased MEPs elicited from the non-targeted hemisphere after stimulating the weaker projections (at time points 30–90 min) (F(1,14) = 18.26, p = 0.001). We conclude that anodal tDCS has differential effects on suprahyoid MEPs elicited from the targeted and non-targeted hemisphere depending on the site of stimulation. This finding may be important for the application of a-tDCS in patients with dysphagia, for example after stroke.
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Affiliation(s)
- Shaofeng Zhao
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University Guangzhou, China ; Department of Rehabilitation Medicine, The First Affiliated Hospital of Soochow University Suzhou, China
| | - Zulin Dou
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University Guangzhou, China
| | - Xiaomei Wei
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University Guangzhou, China
| | - Jin Li
- Department of Neurology, The Third Affiliated Hospital, Sun Yat-sen University Guangzhou, China
| | - Meng Dai
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University Guangzhou, China
| | - Yujue Wang
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University Guangzhou, China
| | - Qinglu Yang
- Department of Rehabilitation Medicine, The Third Affiliated Hospital, Sun Yat-sen University Guangzhou, China
| | - Huai He
- Department of Rehabilitation Medicine, The First Affiliated Hospital of Soochow University Suzhou, China
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Doeltgen SH, Bradnam LV, Young JA, Fong E. Transcranial non-invasive brain stimulation in swallowing rehabilitation following stroke — A review of the literature. Physiol Behav 2015; 143:1-9. [DOI: 10.1016/j.physbeh.2015.02.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 02/11/2015] [Accepted: 02/16/2015] [Indexed: 01/20/2023]
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40
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Horvath JC, Forte JD, Carter O. Evidence that transcranial direct current stimulation (tDCS) generates little-to-no reliable neurophysiologic effect beyond MEP amplitude modulation in healthy human subjects: A systematic review. Neuropsychologia 2015; 66:213-36. [PMID: 25448853 DOI: 10.1016/j.neuropsychologia.2014.11.021] [Citation(s) in RCA: 347] [Impact Index Per Article: 38.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 10/25/2014] [Accepted: 11/14/2014] [Indexed: 12/12/2022]
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Marchina S, Schlaug G, Kumar S. Study design for the fostering eating after stroke with transcranial direct current stimulation trial: a randomized controlled intervention for improving Dysphagia after acute ischemic stroke. J Stroke Cerebrovasc Dis 2014; 24:511-20. [PMID: 25534369 DOI: 10.1016/j.jstrokecerebrovasdis.2014.09.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 09/18/2014] [Accepted: 09/24/2014] [Indexed: 01/14/2023] Open
Abstract
GOAL Dysphagia is a major stroke complication but lacks effective therapy that can promote recovery. Noninvasive brain stimulation with and without peripheral sensorimotor activities may be an attractive treatment option for swallowing recovery but has not been systematically investigated in the stroke population. This article describes the study design of the first prospective, single-center, double-blinded trial of anodal versus sham transcranial direct current stimulation (tDCS) used in combination with swallowing exercises in patients with dysphagia from an acute ischemic stroke. The aim of this study is to gather safety data on cumulative sessions of tDCS in acute-subacute phases of stroke, obtain information about effects of this intervention on important physiologic and clinically relevant swallowing parameters, and examine possible dose effects. METHODS Ninety-nine consecutive patients with dysphagia from an acute unilateral hemispheric infarction with a Penetration and Aspiration Scale (PAS) score of 4 or more and without other confounding reasons for dysphagia will be enrolled at a single tertiary care center. Subjects will be randomized to either a high or low dose tDCS or a sham group and will undergo 10 sessions over 5 consecutive days concomitantly with effortful swallowing maneuvers. The main efficacy measures are a change in the PAS score before and after treatment; the main safety measures are mortality, seizures, neurologic, motor, and swallowing deterioration. CONCLUSIONS The knowledge gained from this study will help plan a larger confirmatory trial for treating stroke-related dysphagia and advance our understanding of important covariates influencing swallowing recovery and response to the proposed intervention.
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Affiliation(s)
- Sarah Marchina
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Gottfried Schlaug
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts
| | - Sandeep Kumar
- Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts.
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Cosentino G, Alfonsi E, Brighina F, Fresia M, Fierro B, Sandrini G, Schindler A, Valentino F, Fontana D, Priori A. Transcranial direct current stimulation enhances sucking of a liquid bolus in healthy humans. Brain Stimul 2014; 7:817-22. [PMID: 25301763 DOI: 10.1016/j.brs.2014.09.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 09/09/2014] [Accepted: 09/10/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Transcranial direct current stimulation (tDCS) is a non-invasive technique used for modulating cortical excitability in vivo in humans. Here we evaluated the effect of tDCS on behavioral and electrophysiological aspects of physiological sucking and swallowing. METHODS Twelve healthy subjects underwent three tDCS sessions (anodal, cathodal and sham stimulation) on separate days in a double-blind randomized order. The active electrode was placed over the right swallowing motor cortex. Repeated sucking and swallowing acts were performed at baseline and at 15 and 60 min after each tDCS session and the mean liquid bolus volume ingested at each time point was measured. We also calculated average values of the following electrophysiological parameters: 1) area and 2) duration of the rectified EMG signal from the suprahyoid/submental muscles related to the sucking and swallowing phases; 3) EMG peak amplitude for the sucking and swallowing phases; 4) area and peak amplitude of the laryngeal-pharyngeal mechanogram; 5) oropharyngeal delay. RESULTS The volume of the ingested bolus significantly increased (by an average of about 30% compared with the baseline value) both at 15 and at 60 min after the end of anodal tDCS. The electrophysiological evaluation after anodal tDCS showed a significant increase in area and duration of the sucking phase-related EMG signal. CONCLUSIONS Anodal tDCS leads to stronger sucking of a liquid bolus in healthy subjects, likely by increasing recruitment of cortical areas of the swallowing network. This finding might open up interesting perspectives for the treatment of patients suffering from dysphagia due to various pathological conditions.
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Affiliation(s)
- Giuseppe Cosentino
- Department of Experimental Biomedicine and Clinical Neurosciences (BioNeC), University of Palermo, Italy
| | - Enrico Alfonsi
- Department of Neurophysiopathology, C. Mondino National Institute of Neurology Foundation, IRCCS, Pavia, Italy.
| | - Filippo Brighina
- Department of Experimental Biomedicine and Clinical Neurosciences (BioNeC), University of Palermo, Italy
| | - Mauro Fresia
- Department of Neurophysiopathology, C. Mondino National Institute of Neurology Foundation, IRCCS, Pavia, Italy
| | - Brigida Fierro
- Department of Experimental Biomedicine and Clinical Neurosciences (BioNeC), University of Palermo, Italy
| | - Giorgio Sandrini
- Department of Neurophysiopathology, C. Mondino National Institute of Neurology Foundation, IRCCS, Pavia, Italy; Department of Brain and Behaviour, University of Pavia, Italy
| | - Antonio Schindler
- Department of Clinical Sciences "L. Sacco", University of Milan, Italy
| | - Francesca Valentino
- Department of Experimental Biomedicine and Clinical Neurosciences (BioNeC), University of Palermo, Italy
| | - Danilo Fontana
- Department of Neurophysiopathology, C. Mondino National Institute of Neurology Foundation, IRCCS, Pavia, Italy
| | - Alberto Priori
- Department of Neurological Sciences, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, University of Milan, Italy
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Effects of transcranial direct current stimulation on esophageal motility in patients with gastroesophageal reflux disease. Clin Neurophysiol 2014; 125:1840-6. [DOI: 10.1016/j.clinph.2013.12.110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 12/19/2013] [Accepted: 12/24/2013] [Indexed: 12/18/2022]
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Macrae PR, Jones RD, Huckabee ML. The effect of swallowing treatments on corticobulbar excitability: a review of transcranial magnetic stimulation induced motor evoked potentials. J Neurosci Methods 2014; 233:89-98. [PMID: 24932964 DOI: 10.1016/j.jneumeth.2014.06.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 06/07/2014] [Accepted: 06/09/2014] [Indexed: 10/25/2022]
Abstract
Transcranial magnetic stimulation (TMS) has been used extensively as a method of investigating the corticomotor physiology of many motor tasks, including healthy and disordered swallowing. Changes in excitability of cortical projections to various swallowing muscles have been documented in response to treatments with TMS induced motor evoked potentials (MEPs). These studies have provided valuable insight into CNS response to swallowing impairment, and more importantly, the adaptations associated with functional recovery. However, unique obstacles are presented when investigating corticobulbar neurophysiology associated with the complex task of swallowing. Stringent methodological control and supplementary outcome measures are required to ensure robust and clinically applicable findings. This article offers a tutorial for the researcher who may be considering the use of TMS for investigating changes in cortical excitability associated with various swallowing paradigms. Included is a review of the mechanisms of TMS and what can be measured with this technique, a summary of existing research using MEPs to investigate swallowing, a review of methodological factors that may influence outcomes, and proposed directions for new areas of research.
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Affiliation(s)
- Phoebe R Macrae
- New Zealand Brain Research Institute, 66 Stewart Street, Christchurch, New Zealand; Department of Communication Disorders, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
| | - Richard D Jones
- New Zealand Brain Research Institute, 66 Stewart Street, Christchurch, New Zealand; Department of Communication Disorders, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; Department of Medicine, University of Otago, Private Bag 4710, Christchurch, New Zealand; Department of Medical Physics and Bioengineering, Canterbury District Health Board, Private Bag 4710, Christchurch, New Zealand.
| | - Maggie-Lee Huckabee
- New Zealand Brain Research Institute, 66 Stewart Street, Christchurch, New Zealand; Department of Communication Disorders, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
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Huckabee ML, Macrae P. Rethinking Rehab: Skill-Based Training for Swallowing Impairment. ACTA ACUST UNITED AC 2014. [DOI: 10.1044/sasd23.1.46] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Current rehabilitation approaches for swallowing impairment are limited by a general lack of specificity to associated pathophysiology, with many of our practices focusing on increasing strength of muscle activation. However, alternative rehabilitative options are emerging. One of these speculates on the concept of “skill training” for swallowing rehabilitation in neurogenic dysphagia. The presumed intent of this approach is to modulate neural substrates and refine motor planning for swallowing using intrinsically generated cortical modulation and adaptive practice. This manuscript provides a discussion of skill training in the context of physical rehabilitation, illustrating how this information may translate to the diagnosis and remediation of swallowing impairment. This information prompts the consideration of more diverse swallowing pathophysiologies, beyond peripheral muscle weakness. The focus on skill training approaches provides a pathway by which greater specificity of diagnosis and treatment can occur.
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Affiliation(s)
- Maggie-Lee Huckabee
- Department of Communication Disorders, University of CanterburyChristchurch, New Zealand
| | - Phoebe Macrae
- Department of Physical Medicine and Rehabilitation, Johns Hopkins School of MedicineBaltimore, MD
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Macrae P, Humbert I. Exploiting Experience-Dependent Plasticity in Dysphagia Rehabilitation: Current Evidence and Future Directions. CURRENT PHYSICAL MEDICINE AND REHABILITATION REPORTS 2013. [DOI: 10.1007/s40141-013-0025-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Vasant DH, Mistry S, Michou E, Jefferson S, Rothwell JC, Hamdy S. Transcranial direct current stimulation reverses neurophysiological and behavioural effects of focal inhibition of human pharyngeal motor cortex on swallowing. J Physiol 2013; 592:695-709. [PMID: 24247983 PMCID: PMC3934709 DOI: 10.1113/jphysiol.2013.263475] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The human cortical swallowing system exhibits bilateral but functionally asymmetric representation in health and disease as evidenced by both focal cortical inhibition (pre-conditioning with 1 Hz repetitive transcranial magnetic stimulation; rTMS) and unilateral stroke, where disruption of the stronger (dominant) pharyngeal projection alters swallowing neurophysiology and behaviour. Moreover, excitatory neurostimulation protocols capable of reversing the disruptive effects of focal cortical inhibition have demonstrated therapeutic promise in post-stroke dysphagia when applied contralaterally. In healthy participants (n = 15, 8 males, mean age (±SEM) 35 ± 9 years), optimal parameters of transcranial direct current stimulation (tDCS) (anodal, 1.5 mA, 10 min) were applied contralaterally after 1 Hz rTMS pre-conditioning to the strongest pharyngeal projection. Swallowing neurophysiology was assessed in both hemispheres by intraluminal recordings of pharyngeal motor-evoked responses (PMEPs) to single-pulse TMS as a measure of cortical excitability. Swallowing behaviour was examined using a pressure-based reaction time protocol. Measurements were made before and for up to 60 min post intervention. Subjects were randomised to active or sham tDCS after 1 Hz rTMS on separate days and data were compared using repeated measures ANOVA. Active tDCS increased PMEPs bilaterally (F1,14 = 7.4, P = 0.017) reversing the inhibitory effects of 1 Hz rTMS in the pre-conditioned hemisphere (F1,14 = 10.1, P = 0.007). Active tDCS also enhanced swallowing behaviour, increasing the number of correctly timed challenge swallows compared to sham (F1,14 = 6.3, P = 0.025). Thus, tDCS to the contralateral pharyngeal motor cortex reverses the neurophysiological and behavioural effects of focal cortical inhibition on swallowing in healthy individuals and has therapeutic potential for dysphagia rehabilitation.
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Affiliation(s)
- Dipesh H Vasant
- Gastrointestinal Centre, Institute of Inflammation and Repair, University of Manchester, Manchester Academic Health Sciences Centre (MAHSC), Salford Royal NHS Foundation Trust, Salford M6 8HD, UK.
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Michou E, Mistry S, Jefferson S, Tyrrell P, Hamdy S. Characterizing the mechanisms of central and peripheral forms of neurostimulation in chronic dysphagic stroke patients. Brain Stimul 2013; 7:66-73. [PMID: 24314909 PMCID: PMC3893483 DOI: 10.1016/j.brs.2013.09.005] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 09/12/2013] [Accepted: 09/17/2013] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Swallowing problems following stroke may result in increased risk of aspiration pneumonia, malnutrition, and dehydration. OBJECTIVE/HYPOTHESIS Our hypothesis was that three neurostimulation techniques would produce beneficial effects on chronic dysphagia following stroke through a common brain mechanism that would predict behavioral response. METHODS In 18 dysphagic stroke patients (mean age: 66 ± 3 years, 3 female, time-post-stroke: 63 ± 15 weeks [±SD]), pharyngeal electromyographic responses were recorded after single-pulse transcranial magnetic stimulation (TMS) over the pharyngeal motor cortex, to measure corticobulbar excitability before, immediately, and 30 min, after real and sham applications of neurostimulation. Patients were randomized to a single session of either: pharyngeal electrical stimulation (PES), paired associative stimulation (PAS) or repetitive TMS (rTMS). Penetration-aspiration scores and bolus transfer timings were assessed before and after both real and sham interventions using videofluoroscopy. RESULTS Corticobulbar excitability of pharyngeal motor cortex was beneficially modulated by PES, PAS and to a lesser extent by rTMS, with functionally relevant changes in the unaffected hemisphere. Following combining the results of real neurostimulation, an overall increase in corticobulbar excitability in the unaffected hemisphere (P = .005, F1,17 = 10.6, ANOVA) with an associated 15% reduction in aspiration (P = .005, z = -2.79) was observed compared to sham. CONCLUSIONS In this mechanistic study, an increase in corticobulbar excitability the unaffected projection was correlated with the improvement in swallowing safety (P = .001, rho = -.732), but modality-specific differences were observed. Paradigms providing peripheral input favored change in neurophysiological and behavioral outcome measures in chronic dysphagia patients. Further larger cohort studies of neurostimulation in chronic dysphagic stroke are imperative.
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Affiliation(s)
- Emilia Michou
- Gastrointestinal Centre, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester (Part of the Manchester Academic Health Sciences Centre [MAHSC]), Salford Royal Hospital, Clinical Sciences Building, Salford M6 8HD, UK
| | - Satish Mistry
- Gastrointestinal Centre, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester (Part of the Manchester Academic Health Sciences Centre [MAHSC]), Salford Royal Hospital, Clinical Sciences Building, Salford M6 8HD, UK
| | - Samantha Jefferson
- Gastrointestinal Centre, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester (Part of the Manchester Academic Health Sciences Centre [MAHSC]), Salford Royal Hospital, Clinical Sciences Building, Salford M6 8HD, UK
| | - Pippa Tyrrell
- Stroke Medicine, Institute of Cardiovascular Sciences, University of Manchester (Part of the Manchester Academic Health Sciences Centre [MAHSC]), Salford Royal Hospital Foundation Trust, Salford M6 8HD, UK
| | - Shaheen Hamdy
- Gastrointestinal Centre, Institute of Inflammation and Repair, Faculty of Medical and Human Sciences, University of Manchester (Part of the Manchester Academic Health Sciences Centre [MAHSC]), Salford Royal Hospital, Clinical Sciences Building, Salford M6 8HD, UK.
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Neurostimulation as an Approach to Dysphagia Rehabilitation: Current Evidence. CURRENT PHYSICAL MEDICINE AND REHABILITATION REPORTS 2013. [DOI: 10.1007/s40141-013-0034-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Suntrup S, Teismann I, Wollbrink A, Winkels M, Warnecke T, Flöel A, Pantev C, Dziewas R. Magnetoencephalographic evidence for the modulation of cortical swallowing processing by transcranial direct current stimulation. Neuroimage 2013; 83:346-54. [PMID: 23800793 DOI: 10.1016/j.neuroimage.2013.06.055] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Revised: 05/25/2013] [Accepted: 06/17/2013] [Indexed: 12/12/2022] Open
Abstract
Swallowing is a complex neuromuscular task that is processed within multiple regions of the human brain. Rehabilitative treatment options for dysphagia due to neurological diseases are limited. Because the potential for adaptive cortical changes in compensation of disturbed swallowing is recognized, neuromodulation techniques like transcranial direct current stimulation (tDCS) are currently considered as a treatment option. Here we evaluate the effect of tDCS on cortical swallowing network activity and behavior. In a double-blind crossover study, anodal tDCS (20 min, 1 mA) or sham stimulation was administered over the left or right swallowing motor cortex in 21 healthy subjects in separate sessions. Cortical activation was measured using magnetoencephalography (MEG) before and after tDCS during cued "simple", "fast" and "challenged" swallow tasks with increasing levels of difficulty. Swallowing response times and accuracy were measured. Significant bilateral enhancement of cortical swallowing network activation was found in the theta frequency range after left tDCS in the fast swallow task (p=0.006) and following right tDCS in the challenged swallow task (p=0.007), but not after sham stimulation. No relevant behavioral effects were observed on swallow response time, but swallow precision improved after left tDCS (p<0.05). Anodal tDCS applied over the swallowing motor cortex of either hemisphere was able to increase bilateral swallow-related cortical network activation in a frequency specific manner. These neuroplastic effects were associated with subtle behavioral gains during complex swallow tasks in healthy individuals suggesting that tDCS deserves further evaluation as a treatment tool for dysphagia.
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Affiliation(s)
- Sonja Suntrup
- Institute for Biomagnetism and Biosignal Analysis, University of Muenster, Malmedyweg 15, 48149 Muenster, Germany; Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149 Münster, Germany.
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