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Sandoval-Pistorius SS, Hacker ML, Waters AC, Wang J, Provenza NR, de Hemptinne C, Johnson KA, Morrison MA, Cernera S. Advances in Deep Brain Stimulation: From Mechanisms to Applications. J Neurosci 2023; 43:7575-7586. [PMID: 37940596 PMCID: PMC10634582 DOI: 10.1523/jneurosci.1427-23.2023] [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: 07/27/2023] [Revised: 08/14/2023] [Accepted: 08/15/2023] [Indexed: 11/10/2023] Open
Abstract
Deep brain stimulation (DBS) is an effective therapy for various neurologic and neuropsychiatric disorders, involving chronic implantation of electrodes into target brain regions for electrical stimulation delivery. Despite its safety and efficacy, DBS remains an underutilized therapy. Advances in the field of DBS, including in technology, mechanistic understanding, and applications have the potential to expand access and use of DBS, while also improving clinical outcomes. Developments in DBS technology, such as MRI compatibility and bidirectional DBS systems capable of sensing neural activity while providing therapeutic stimulation, have enabled advances in our understanding of DBS mechanisms and its application. In this review, we summarize recent work exploring DBS modulation of target networks. We also cover current work focusing on improved programming and the development of novel stimulation paradigms that go beyond current standards of DBS, many of which are enabled by sensing-enabled DBS systems and have the potential to expand access to DBS.
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Affiliation(s)
| | - Mallory L Hacker
- Department of Neurology, Vanderbilt University Medical Center, Nashville, Tennessee 37232
| | - Allison C Waters
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, New York 10029
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, New York 10029
| | - Jing Wang
- Department of Neurology, University of Minnesota, Minneapolis, Minnesota 55455
| | - Nicole R Provenza
- Department of Neurosurgery, Baylor College of Medicine, Houston, Texas 77030
| | - Coralie de Hemptinne
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, University of Florida, Gainesville, Florida 32608
| | - Kara A Johnson
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, University of Florida, Gainesville, Florida 32608
| | - Melanie A Morrison
- Department of Radiology and Biomedical Imaging, University of California-San Francisco, San Francisco, California 94143
| | - Stephanie Cernera
- Department of Neurological Surgery, University of California-San Francisco, San Francisco, California 94143
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Najera RA, Mahavadi AK, Khan AU, Boddeti U, Del Bene VA, Walker HC, Bentley JN. Alternative patterns of deep brain stimulation in neurologic and neuropsychiatric disorders. Front Neuroinform 2023; 17:1156818. [PMID: 37415779 PMCID: PMC10320008 DOI: 10.3389/fninf.2023.1156818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 06/06/2023] [Indexed: 07/08/2023] Open
Abstract
Deep brain stimulation (DBS) is a widely used clinical therapy that modulates neuronal firing in subcortical structures, eliciting downstream network effects. Its effectiveness is determined by electrode geometry and location as well as adjustable stimulation parameters including pulse width, interstimulus interval, frequency, and amplitude. These parameters are often determined empirically during clinical or intraoperative programming and can be altered to an almost unlimited number of combinations. Conventional high-frequency stimulation uses a continuous high-frequency square-wave pulse (typically 130-160 Hz), but other stimulation patterns may prove efficacious, such as continuous or bursting theta-frequencies, variable frequencies, and coordinated reset stimulation. Here we summarize the current landscape and potential clinical applications for novel stimulation patterns.
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Affiliation(s)
- Ricardo A. Najera
- Department of Neurosurgery, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Anil K. Mahavadi
- Department of Neurosurgery, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Anas U. Khan
- Department of Neurosurgery, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Ujwal Boddeti
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Victor A. Del Bene
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Harrison C. Walker
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - J. Nicole Bentley
- Department of Neurosurgery, University of Alabama at Birmingham, Birmingham, AL, United States
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Huh R, Chung M, Jang I. Outcome of pallidal deep brain stimulation for treating isolated orofacial dystonia. Acta Neurochir (Wien) 2022; 164:2287-2298. [PMID: 35896828 DOI: 10.1007/s00701-022-05320-9] [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: 11/21/2021] [Accepted: 07/15/2022] [Indexed: 12/14/2022]
Abstract
BACKGROUND Isolated orofacial dystonia is a rare segmental neurological disorder that affects the eye, mouth, face, and jaws. Current literature on pallidal surgery for orofacial dystonia is limited to case reports and small-scale studies. This study was to investigate clinical outcomes of deep brain stimulation (DBS) of the globus pallidus internus (GPi) in patients with isolated orofacial dystonia. METHODS Thirty-six patients who underwent GPi DBS at Incheon St. Mary's Hospital, The Catholic University of Korea, between 2014 and 2019 were included in this study. Burke-Fahn-Marsden Dystonia Rating Scale, Unified Dystonia Rating Scale, and Global Dystonia Severity Rating Scale were retrospectively retrieved for analysis before surgery, at 6-month follow-up as short-term outcome, and at follow-up over 1 year (12 months to 69 months) as long-term results. RESULTS Mean total BFMDRS-M scores at the three time points (baseline, 6 months, and over 1 year follow-up) were 11.6 ± 4.9, 6.1 ± 5.2 (50.3 ± 29.9% improvement, p < 0.05), and 4.3 ± 4.2 (65.0 ± 24.2% improvement, p < 0.05), respectively. In terms of UDRS and GDS, improvement rates were 45.1% (p < 0.001) and 47.7% (p < 0.001) at 6 months, and 63.8% (p < 0.001) and 65.7% (p < 0.001) at over 1 year after surgery, respectively. CONCLUSIONS Bilateral GPi DBS in isolated orofacial dystonia can be effective if conservative treatment option fails. Its benefit is not only observed in a short term, but also maintained in a long-term follow-up.
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Affiliation(s)
- Ryoong Huh
- Department of Neurosurgery, College of Medicine, Incheon St. Mary's Hospital, The Catholic University of Korea, 56, Dongsu-ro, Bupyeong-Gu, Incheon, 21431, Republic of Korea
| | - Moonyoung Chung
- Department of Neurosurgery, Soonchunhyang University Bucheon Hospital, Soonchunhyang University, 170 Jomaru-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 14585, Republic of Korea
| | - Il Jang
- Department of Neurosurgery, College of Medicine, Incheon St. Mary's Hospital, The Catholic University of Korea, 56, Dongsu-ro, Bupyeong-Gu, Incheon, 21431, Republic of Korea.
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Lucas J, Kusyk D, Whiting D. Bilateral pallidal DBS for blepharospasm: A case report and review of the literature. Surg Neurol Int 2022; 13:200. [PMID: 35673639 PMCID: PMC9168297 DOI: 10.25259/sni_1234_2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Accepted: 04/21/2022] [Indexed: 11/04/2022] Open
Abstract
Background:
Deep brain stimulation (DBS) of the globus pallidus internus (GPi) in the treatment of craniocervical dystonia often requires an extended period of stimulation parameter manipulations.
Case Description:
We present a patient suffering from debilitating blepharospasm treated with bilateral DBS of the GPi alongside 7 years of stimulation parameter manipulations and a literature review of comparable patients.
Conclusion:
Our literature review suggests that a patient’s specific dystonic symptoms can guide stimulation parameter manipulations. Further research regarding trends in stimulation parameters being used in the field for different dystonic symptoms may expedite the stimulation parameter manipulation process.
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Affiliation(s)
- Joshua Lucas
- MD Program, Drexel University College of Medicine, Philadelphia,
| | - Dorian Kusyk
- Department of Neurosurgery, Allegheny Health Network, Pittsburgh, Pennsylvania, United States
| | - Donald Whiting
- Department of Neurosurgery, Allegheny Health Network, Pittsburgh, Pennsylvania, United States
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Ma H, Qu J, Ye L, Shu Y, Qu Q. Blepharospasm, Oromandibular Dystonia, and Meige Syndrome: Clinical and Genetic Update. Front Neurol 2021; 12:630221. [PMID: 33854473 PMCID: PMC8039296 DOI: 10.3389/fneur.2021.630221] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 03/08/2021] [Indexed: 12/14/2022] Open
Abstract
Meige syndrome (MS) is cranial dystonia characterized by the combination of upper and lower cranial involvement and including binocular eyelid spasms (blepharospasm; BSP) and involuntary movements of the jaw muscles (oromandibular dystonia; OMD). The etiology and pathogenesis of this disorder of the extrapyramidal system are not well-understood. Neurologic and ophthalmic examinations often reveal no abnormalities, making diagnosis difficult and often resulting in misdiagnosis. A small proportion of patients have a family history of the disease, but to date no causative genes have been identified to date and no cure is available, although botulinum toxin A therapy effectively mitigates the symptoms and deep brain stimulation is gaining increasing attention as a viable alternative treatment option. Here we review the history and progress of research on MS, BSP, and OMD, as well as the etiology, pathology, diagnosis, and treatment.
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Affiliation(s)
- Hongying Ma
- Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Institute for Rational and Safe Medication Practices, Xiangya Hospital, Central South University, Changsha, China
| | - Jian Qu
- Department of Pharmacy, The Second Xiangya Hospital, Central South University, Changsha, China
- Institute of Clinical Pharmacy, Central South University, Changsha, China
| | - Liangjun Ye
- Department of Pharmacy, Hunan Provincial Corps Hospital of Chinese People's Armed Police Force, Changsha, China
| | - Yi Shu
- Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Qiang Qu
- Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Institute for Rational and Safe Medication Practices, Xiangya Hospital, Central South University, Changsha, China
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Wang X, Zhang Z, Mao Z, Yu X. Deep brain stimulation for Meige syndrome: a meta-analysis with individual patient data. J Neurol 2019; 266:2646-2656. [PMID: 31302747 DOI: 10.1007/s00415-019-09462-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 07/02/2019] [Accepted: 07/08/2019] [Indexed: 12/21/2022]
Abstract
BACKGROUND Deep brain stimulation (DBS) is an effective intervention for Meige syndrome, a type of dystonia characterized by blepharospasm, facial, and oromandibular dystonia. This individual patient-level data meta-analysis was to identify the potential outcome predictors, compare the stimulation targets and summarize the efficacy of DBS for Meige syndrome. METHODS Three electronic databases (PubMed, Web of Science and Embase) were searched with no publication data restriction to identify studies regarding DBS for Meige syndrome. The primary outcome was the improvement in BFMDRS-M score. Pearson's correlation coefficients and a stepwise multivariate regression analysis were used to identify the potential prognostic factors. RESULTS Twenty-three studies (115 patients, 94 with pallidal stimulation and 21 with subthalamic stimulation) were eligible. Patients showed significant improvement in Burke-Fahn-Marsden Dystonia Rating Scale movement (BFMDRS-M) (21.5 ± 11.0 vs 8.6 ± 6.9, P < 0.001) and disability (BFMDRS-D) (6.4 ± 5.1 vs 2.9 ± 2.4, P < 0.001) scores at the last follow-up visit (31.9 ± 30.7 months), compared with scores at baseline. Preoperative BFMDRS-M and BFMDRS-D scores were positively correlated with the relative changes in BFMDRS-M score at the last follow-up visit. On the stepwise multivariate regression, only the preoperative BFMDRS remained significant in the best predictive model. CONCLUSIONS Based on the existing evidence, pallidal/subthalamic stimulation is an effective therapy for even the refractory Meige syndrome. Higher preoperative scores probably indicate larger improvement. Stimulation targets or other clinical factors do not constitute the outcome predictive factors.
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Affiliation(s)
- Xin Wang
- School of Medicine, Nankai University, 94 Weijin Road, Naikai District, Tianjin, 300071, China
- Department of Neurosurgery, The First Medical Center of Chinese, PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Zhibin Zhang
- School of Medicine, Nankai University, 94 Weijin Road, Naikai District, Tianjin, 300071, China
- Department of Neurosurgery, The First Medical Center of Chinese, PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Zhiqi Mao
- Department of Neurosurgery, The First Medical Center of Chinese, PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, China
| | - Xinguang Yu
- School of Medicine, Nankai University, 94 Weijin Road, Naikai District, Tianjin, 300071, China.
- Department of Neurosurgery, The First Medical Center of Chinese, PLA General Hospital, 28 Fuxing Road, Haidian District, Beijing, 100853, China.
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Wang X, Mao Z, Cui Z, Xu X, Pan L, Liang S, Ling Z, Yu X. Predictive factors for long-term clinical outcomes of deep brain stimulation in the treatment of primary Meige syndrome. J Neurosurg 2019; 132:1367-1375. [PMID: 30952124 DOI: 10.3171/2019.1.jns182555] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 01/14/2019] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Primary Meige syndrome is characterized by blepharospasm and orofacial-cervical dystonia. Deep brain stimulation (DBS) is recognized as an effective therapy for patients with this condition, but previous studies have focused on clinical effects. This study explored the predictors of clinical outcome in patients with Meige syndrome who underwent DBS. METHODS Twenty patients who underwent DBS targeting the bilateral subthalamic nucleus (STN) or globus pallidus internus (GPi) at the Chinese People's Liberation Army General Hospital from August 2013 to February 2018 were enrolled in the study. Their clinical outcomes were evaluated using the Burke-Fahn-Marsden Dystonia Rating Scale at baseline and at the follow-up visits; patients were accordingly divided into a good-outcome group and a poor-outcome group. Putative influential factors, such as age and course of disease, were examined separately, and the factors that reached statistical significance were subjected to logistic regression analysis to identify predictors of clinical outcomes. RESULTS Four factors showed significant differences between the good- and poor-outcome groups: 1) the DBS target (STN vs GPi); 2) whether symptoms first appeared at multiple sites or at a single site; 3) the sub-item scores of the mouth at baseline; and 4) the follow-up period (p < 0.05). Binary logistic regression analysis revealed that initial involvement of multiple sites and the mouth score were the only significant predictors of clinical outcome. CONCLUSIONS The severity of the disease in the initial stage and presurgical period was the only independent predictive factor of the clinical outcomes of DBS for the treatment of patients with Meige syndrome.
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Affiliation(s)
- Xin Wang
- 1School of Medicine, Nankai University, Tianjin; and.,2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
| | - Zhiqi Mao
- 2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
| | - Zhiqiang Cui
- 2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
| | - Xin Xu
- 2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
| | - Longsheng Pan
- 2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
| | - Shuli Liang
- 2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
| | - Zhipei Ling
- 2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
| | - Xinguang Yu
- 1School of Medicine, Nankai University, Tianjin; and.,2Department of Neurosurgery, Chinese PLA General Hospital, Beijing, China
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The impact of deep brain stimulation on health related quality of life and disease-specific disability in Meige Syndrome (MS). Clin Neurol Neurosurg 2018; 171:53-57. [DOI: 10.1016/j.clineuro.2018.05.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 03/06/2018] [Accepted: 05/10/2018] [Indexed: 12/21/2022]
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9
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Bilateral pallidotomy for Meige syndrome. Acta Neurochir (Wien) 2017; 159:1359-1363. [PMID: 28424916 DOI: 10.1007/s00701-017-3178-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 03/30/2017] [Indexed: 10/19/2022]
Abstract
Meige syndrome (MS) is usually described as a combination of blepharospasm with oromandibular dystonia. There are a large number of case reports of deep brain stimulation (DBS) of the globus pallidus internus (GPI) for MS and only one report of unilateral pallidotomy (PT). We report the first case of staged bilateral PT for treatment of a patient with MS using intraoperative high-frequency stimulation in order to predict and prevent postoperative deficit. There was a significant improvement of the Burk-Fahn-Marsden dystonia rating scale from 26 to 3. There were no adverse postoperative neurological and neuropsychological events.
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Pandey S, Sharma S. Meige's syndrome: History, epidemiology, clinical features, pathogenesis and treatment. J Neurol Sci 2017; 372:162-170. [DOI: 10.1016/j.jns.2016.11.053] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 10/31/2016] [Accepted: 11/21/2016] [Indexed: 10/20/2022]
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Wang X, Zhang C, Wang Y, Liu C, Zhao B, Zhang JG, Hu W, Shao X, Zhang K. Deep Brain Stimulation for Craniocervical Dystonia (Meige Syndrome): A Report of Four Patients and a Literature-Based Analysis of Its Treatment Effects. Neuromodulation 2015; 19:818-823. [DOI: 10.1111/ner.12345] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 06/20/2015] [Accepted: 07/16/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Xiu Wang
- Department of Neurosurgery; Beijing Tiantan Hospital; Capital Medical University; Beijing China
- Beijing Key Laboratory of Neurostimulation; Beijing China
| | - Chao Zhang
- Department of Neurosurgery; Beijing Tiantan Hospital; Capital Medical University; Beijing China
- Beijing Key Laboratory of Neurostimulation; Beijing China
| | - Yao Wang
- Department of Neurosurgery; Beijing Tiantan Hospital; Capital Medical University; Beijing China
- Beijing Key Laboratory of Neurostimulation; Beijing China
| | - Chang Liu
- Department of Neurosurgery; Beijing Tiantan Hospital; Capital Medical University; Beijing China
- Beijing Key Laboratory of Neurostimulation; Beijing China
| | - Baotian Zhao
- Department of Neurosurgery; Beijing Tiantan Hospital; Capital Medical University; Beijing China
- Beijing Key Laboratory of Neurostimulation; Beijing China
| | - Jian-guo Zhang
- Department of Neurosurgery; Beijing Tiantan Hospital; Capital Medical University; Beijing China
- Beijing Key Laboratory of Neurostimulation; Beijing China
| | - Wenhan Hu
- Beijing Key Laboratory of Neurostimulation; Beijing China
- Beijing Neurosurgical Institute; Beijing China
| | - Xiaoqiu Shao
- Beijing Key Laboratory of Neurostimulation; Beijing China
- Department of Neurology; Beijing Tiantan Hospital; Capital Medical University; Beijing China
| | - Kai Zhang
- Department of Neurosurgery; Beijing Tiantan Hospital; Capital Medical University; Beijing China
- Beijing Key Laboratory of Neurostimulation; Beijing China
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Abstract
The few controlled studies that have been carried out have shown that bilateral internal globus pallidum stimulation is a safe and long-term effective treatment for hyperkinetic disorders. However, most recent published data on deep brain stimulation (DBS) for dystonia, applied to different targets and patients, are still mainly from uncontrolled case reports (especially for secondary dystonia). This precludes clear determination of the efficacy of this procedure and the choice of the 'good' target for the 'good' patient. We performed a literature analysis on DBS for dystonia according to the expected outcome. We separated those with good evidence of favourable outcome from those with less predictable outcome. In the former group, we review the main results for primary dystonia (generalised/focal) and highlight recent data on myoclonus-dystonia and tardive dystonia (as they share, with primary dystonia, a marked beneficial effect from pallidal stimulation with good risk/benefit ratio). In the latter group, poor or variable results have been obtained for secondary dystonia (with a focus on heredodegenerative and metabolic disorders). From this overview, the main results and limits for each subgroup of patients that may help in the selection of dystonic patients who will benefit from DBS are discussed.
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Affiliation(s)
- Marie Vidailhet
- AP-HP, Department of Neurology, Groupe Hospitalier Pitié-Salpêtrière, Paris, France.
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Vidailhet M, Jutras MF, Roze E, Grabli D. Deep brain stimulation for dystonia. HANDBOOK OF CLINICAL NEUROLOGY 2013; 116:167-187. [PMID: 24112893 DOI: 10.1016/b978-0-444-53497-2.00014-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The few reported controlled studies show that bilateral stimulation of the globus pallidus interna (GPi) is a safe and effective long-term treatment for hyperkinetic disorders. However, the recently published data on deep brain stimulation (DBS) applied to different targets or patients (especially those with secondary dystonia) are mainly uncontrolled case reports, precluding a clear determination of its efficacy, and providing little guidance as to the choice of a "good" target in a "good" patient. This chapter reviews the literature on DBS in primary dystonia, paying particular attention to the risk:benefit ratio in focal and segmental dystonias (cervical dystonia, cranial dystonia) and to the predictive factors for a good outcome. The chapter also highlights recent data on the marked benefits of the technique in myoclonus dystonia (in which pallidal, as opposed to thalamic, stimulation is more effective) and in tardive dystonia-dyskinesia. Although, the decision to treat appears relatively straightforward in patients with primary dystonia, myoclonus-dystonia, and tardive dystonia who have a normal findings on magnetic resonance imaging and normal cognitive function, there are still no reliable tools to help predict the timescale of postoperative benefit. This chapter provides a comprehensive analysis of the use of the treatment in various types of secondary dystonia, with little to moderate benefit in most cases, based on single cases or small series. Beyond the reduction in the severity of dystonia, the global motor and functional outcome is difficult to determine owing to the paucity of adequate evaluation tools. Because of the large interpatient variability, different targets may be effective depending on the symptoms in each individual.
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Affiliation(s)
- Marie Vidailhet
- Department of Neurology, Groupe Hospitalier Pitié-Salpêtrière, Paris, France; Research Center of the Brain and Spinal Cord Institute, Université Paris 6/Inserm UMR S975, Paris, France; Pierre et Marie Curie Paris-6 University, Paris, France
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