Considerations in deep brain stimulation (DBS) for pediatric secondary dystonia
Pediatrics; Surgery; Neurosciences & Neurology; cerebral-palsy; Deep brain stimulation; globus-pallidus internus; hemidystonia; Secondary dystonia; Pediatric neurosurgery; surgical-treatment; tone and motor problems; IND; surgical intervention; deep brain stimulation; dystonia
Purpose There is a paucity of effective long-term medication treatment for secondary dystonias. In situations where significantly impairing secondary dystonias fail to respond to typical enteral medications and intrathecal (or even intraventricular) baclofen, consideration should be given to the use of deep brain stimulation (DBS). While Level I evidence and long-term follow-up clearly demonstrate the efficacy of DBS for primary dystonia, the evidence for secondary dystonia remains mixed and unclear. In this study, we report our experience with pediatric subjects who have undergone DBS for secondary dystonia. Methods We discuss the indications and outcomes of DBS procedures completed at our center. We also present a detailed discussion of the considerations in the management of these patients as well as a literature review. Results Of the four cases retrospectively examined here, all subjects experienced reductions in the severity of their dystonia (ranging from 0 to 100% on both the Barry-Albright Dystonia (BAD) and Burke-Fahn-Marsden Dystonia Rating Scale-Motor (BFMDRS-M) scales). Conclusions Pallidal DBS should be considered among children with functionally debilitating, medication-resistant secondary dystonia. Patients without fixed skeletal deformities who have experienced a short duration of symptoms are most likely to benefit from this intervention.
Tsering D; Tochen L; Lavenstein B; Reddy S K; Granader Y; Keating R F; Oluigbo C O
Childs Nervous System
2017
Article information provided for research and reference use only. PedPalASCNET does not hold any rights over the resource listed here. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1007/s00381-017-3361-x" target="_blank" rel="noreferrer noopener">10.1007/s00381-017-3361-x</a>
An evaluation of rating scales utilized for deep brain stimulation for dystonia
Dystonia; Neurosciences & Neurology; Deep brain stimulation; cervical dystonia; globus-pallidus internus; primary generalized dystonia; electrical-stimulation; Globus pallidus internus; movement-disorders; Outcome; pallidotomy; Rating; scales; secondary dystonia; segmental dystonia; term-follow-up; torsion dystonia; tone and motor problems; unspecified Q3 conditions; Q3 conditions; tool development; scale development; surgical intervention; deep brain stimulation
The objective of this study was to examine globus pallidus internus deep brain stimulation (GPi-DBS) outcomes in primary and secondary dystonia, derived from blinded ratings using two scales and two raters. Twenty-five patients with variable presentations of dystonia were evaluated with videotaped standardized dystonia rating scales at preoperative baseline and at 6 and 12 months following GPi-DBS implantation. These 75 examination videos were retrospectively evaluated, independently and in random order, by two movement disorder neurologists who were blinded to the treatment status. Both neurologists scored each videotaped evaluation using the Burke-Fahn-Marsden Dystonia Rating Scale-motor part (BFMDRS-M) and the Unified Dystonia Rating Scale (UDRS). A final score for each video was assigned by averaging the raters' scores. An intra-class correlation coefficient was used to calculate inter-rater reliability. A linear mixed model was fitted to investigate the time effect and its interaction with type of dystonia (primary versus secondary) for each rating scale. Inter-rater reliability was excellent. Intraclass correlation coefficients ranged from 0.994 to 0.997 for both scales at baseline, 6 and 12 months. The average motor improvement scores after GPi DBS for the entire heterogeneous group of dystonia patients after 6 and 12 months of stimulation was 21.32% (p = 0.0010) and 28.95% (p = 0.0017), respectively, when the UDRS score was used. Similar levels of improvement 20.46% (p = 0.0055) at 6 months and 27.39% (p = 0.00197) at 12 months were found using the BFMDRS-M score. Analysis using unblinded scores from our database revealed a 32.99 and 37.27% UDRS improvement at 6 and 12 months, and an improvement in UDRS score of 38.5 and 43.7% when the analysis was limited to only primary dystonia. If the data were further segregated to include only cases of DYT-1 primary generalized dystonia, the UDRS benefit increased to 48.24%. Our primary dystonia group was diluted by the presence of both old- and young-onset patients, as well as focal, segmental and generalized dystonia. In conclusion, (1) evaluating motor outcomes of DBS therapy for dystonia using independent, randomized retrospective rating by blinded raters' results in lower improvement scores than when outcomes are rated by unblinded treating neurologists. Blinded methodology may be superior and might produce a more realistic assessment of motor outcomes after DBS in patients with dystonia; (2) outcomes were similar whether the BFMDRS-M or UDRS was utilized; (3) GPi-DBS was effective in treating sustained involuntary motor co-contractions in medication refractory dystonia patients, more so in primary dystonia.
Susatia F; Malaty I A; Foote K D; Wu S S; Zeilman P R; Mishra M; Rodriguez R L; ul Haq I; Jacobson C E; Sun A Q; Okun M S
Journal of Neurology
2010
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<a href="http://doi.org/10.1007/s00415-009-5261-9" target="_blank" rel="noreferrer noopener">10.1007/s00415-009-5261-9</a>
Deep brain stimulation for dystonia: A meta-analysis
meta-analysis; Neurosciences & Neurology; dystonia; movement disorders; follow-up; scale; cervical dystonia; deep brain stimulation; electric stimulation therapy; globus-pallidus internus; hemidystonia; meige-syndrome; primary generalized dystonia; Research & Experimental Medicine; severe tardive; spasmodic torticollis; stereotaxic techniques; thalamic-stimulation; tone and motor problems; IND; surgical intervention; deep brain stimulation; BFMDRS
Objective. To use a meta-analysis on all reported cases of deep brain stimulation (DBS) for dystonia to determine which factors significantly influence outcome. The Burke-Fahn-Marsden (BFM) movement scale, the most reported measure, was chosen as the primary outcome measure for this analysis. Methods. A MEDLINE search identified 137 patients who underwent DBS for dystonia in 24 studies that had individual BFM scores. Individual patient data, including age at onset of dystonia, age at surgery, gender, distribution of dystonia, etiology of dystonia, presence of associated features, abnormality of preoperative imaging, prior stereotactic surgeries, nucleus stimulated, type of anesthesia used, use of physiologic monitoring, type of imaging used for localization, stimulation parameters used, time of response to stimulation, and timing of outcome assessment were entered into an SPSS database for statistical analysis. Results. The mean BFM percentage change (improvement in postoperative score from baseline) was 51.8% (range -34% to 100%). Significantly better outcomes were achieved with stimulation of the globus pallidus internus (GPi) than with stimulation of the posterior portion of the ventral lateral (VLp) nucleus of the thalamus (p = 0.0001). The etiology of the dystonia also had a significant effect on outcomes. Statistically significant improvements in outcomes were seen for all etiologic categories, except encephalitis. Dystonia due to birth injury and encephalitis had significantly worse outcomes when compared to other etiologies. However, there were no significant differences in the outcomes of patients who were DYT1 (DYT1 is the gene associated with the disorder Dystonia Musculorum Deformans) gene positive, DYT1 gene negative, or had pantothenate kinase-associated neurodegeneration (PKAN), tardive dyskinesia, and idiopathic and posttraumatic dystonias. Longer duration of dystonia symptoms correlated negatively with surgical outcome. A regression model using the three variables-stimulation site, etiology of dystonia, and duration of dystonia symptoms-explained 51% of the variance in outcomes. Conclusion. Deep brain stimulation of the GPi provides significant improvement in BFM scores in a variety of dystonic conditions.
Holloway K L; Baron M S; Brown R; Cifu D X; Carne W; Ramakrishnan V
Neuromodulation
2006
Article information provided for research and reference use only. PedPalASCNET does not hold any rights over the resource listed here. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1111/j.1525-1403.2006.00067.x" target="_blank" rel="noreferrer noopener">10.1111/j.1525-1403.2006.00067.x</a>
Beyond the Burke-Fahn-Marsden Dystonia Rating Scale: Deep brain stimulation in childhood secondary dystonia
children; Pediatrics; Goals; Disability; reliability; Outcomes; patient selection; validity; Neurosciences & Neurology; cerebral-palsy; follow-up; rehabilitation; globus-pallidus internus; primary generalized dystonia; (DBS); Childhood dystonia; Paediatric deep brain stimulation; pediatric movement-disorders; Secondary dystonia; tone and motor problems; Glutaric acidemia type I; surgical intervention; Deep brain stimulation; BFMDRS
Purpose: Deep brain stimulation is now widely accepted as an effective treatment for children with primary generalized dystonia. More variable results are reported in secondary dystonias and its efficacy in this heterogeneous group has not been fully elucidated. Deep brain stimulation outcomes are typically reported using impairment-focused measures, such as the Burke-Fahn-Marsden Dystonia Rating Scale, which provide little information about function and participation outcomes or changes in non-motor areas. The aim is to demonstrate that in some cases of secondary dystonia, the sole use of impairment level measures, such as the Burke-Fahn-Marsden Dystonia Rating Scale, may be insufficient to fully evaluate outcome following deep brain stimulation. Methods: Six paediatric cases who underwent deep brain stimulation surgery with a minimum of one year follow up were selected on the basis of apparent non-response to deep brain stimulation, defined as a clinically insignificant change in the Burke-Fahn-Marsden Dystonia Movement Scale (<20%), but where other evaluation measures demonstrated clinical efficacy across several domains. Results: Despite no significant change in Burke-Fahn-Marsden Dystonia Rating Scale scores following deep brain stimulation, parallel outcome measures demonstrated significant benefit in a range of child and family-centred goal areas including: pain and comfort, school attendance, seating tolerance, access to assistive technology and in some cases carer burden. Conclusions: Sole use of impairment-focused measures, are limited in scope to evaluate outcome following deep brain stimulation, particularly in secondary dystonias. Systematic study of effects across multiple dimensions of disability is needed to determine what deep brain stimulation offers patients in terms of function, participation, care, comfort and quality of life. Deep brain stimulation may offer meaningful change across multiple domains of functioning, disability and health even in the absence of significant change in dystonia rating scales. (c) 2012 European Paediatric Neurology Society. Published by Elsevier Ltd. All rights reserved.
Gimeno H; Tustin K; Selway R; Lin J P
European Journal of Paediatric Neurology
2012
Article information provided for research and reference use only. PedPalASCNET does not hold any rights over the resource listed here. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1016/j.ejpn.2011.12.014" target="_blank" rel="noreferrer noopener">10.1016/j.ejpn.2011.12.014</a>