Deep Brain Stimulation of Anteromedial Globus Pallidus Interna for Severe Tourette's Syndrome
ABSTRACT Multiple anatomical targets for deep brain stimulation (DBS) have been proposed for the treatment of severe Tourette's syndrome. In this open study, the authors evaluated the effectiveness of DBS of the anteromedial globus pallidus interna on tic severity and common comorbidities.
Eleven patients (eight of them men, mean age=39 years) with severe and medically intractable Tourette's syndrome underwent implantation of Medtronic quadripolar electrodes in the globus pallidus interna bilaterally. The primary outcome measure was the Yale Global Tic Severity Scale. Secondary outcome measures included the Yale-Brown Obsessive Compulsive Scale, the Hamilton Depression Rating Scale, the Gilles de la Tourette Syndrome-Quality of Life Scale, and the Global Assessment of Functioning Scale. Follow-up occurred at 1 month and then at a mean of 14 months after surgery (range=4-30 months).
Ten patients (91%) reported improvement in tic severity soon after DBS. Overall, there was a 48% reduction in motor tics and a 56.5% reduction in phonic tics at final follow-up. Six patients (54.5%) had a more than 50% reduction, sustained for at least 3 months, in Yale Global Tic Severity Scale score. Only two patients required ongoing pharmacotherapy for tics after surgery, and patients improved significantly on all secondary measures. One patient did not tolerate DBS and discontinued treatment after 3 months. Greater anxiety in two patients and hardware malfunction in three patients were noteworthy adverse outcomes.
The results suggest anteromedial globus pallidus interna DBS for Tourette's syndrome is an effective and well-tolerated treatment for a subgroup of patients with severe Tourette's syndrome.
- SourceAvailable from: Perminder S Sachdev
[Show abstract] [Hide abstract]
- "factor analysis and acceptable correlations with other rating scales and clinical variables (Cavanna et al., 2008). The scale has been used widely in the assessment of HR-QoL since its development across a number of contexts and by different research teams, including follow-up from deep brain stimulation (Cannon et al., 2012). "
ABSTRACT: Tourette syndrome is often associated with attention deficit hyperactivity disorder, obsessive compulsive disorder and other co-morbidities, the presence of which can reduce health-related quality of life. The relationship between the number and type of co-morbidities and tic severity upon health-related quality of life has been insufficiently examined in Tourette syndrome populations and not at all in the Australian context. We hypothesised that an increased number of co-morbid diagnoses would be inversely related to health-related quality of life and that the presence of attention deficit hyperactivity disorder and obsessive compulsive disorder in particular would negatively impact health-related quality of life. In all, 83 people with a previously established diagnosis of Tourette syndrome, who responded to a letter of invitation sent to the Tourette Syndrome Association of Australia past-member database, formed the study sample. Participants completed the Gilles de la Tourette Syndrome-Quality of Life Scale and a short form of the National Hospital Interview Schedule to assess tics and related behaviours. Participants with pure-Tourette syndrome had significantly better health-related quality of life than those with Tourette syndrome and three or more co-morbid diagnoses. Few differences were observed between the pure-Tourette syndrome and Tourette syndrome and one or two co-morbid diagnoses groups. Analysis of the impact of individual co-morbid disorders and Tourette syndrome symptoms on health-related quality of life indicated that attention deficit hyperactivity disorder exerted a significant negative effect, as did the presence of complex tics, especially coprolalia and copropraxia. When these variables were examined in multiple regression analysis, number of co-morbidities and the presence of coprophenomena emerged as significant predictors of health-related quality of life. While tics are the defining feature of Tourette syndrome, it appears to be the presence of co-morbidities, attention deficit hyperactivity disorder, in particular, and coprophenomena that have the greater impact on health-related quality of life. This has implications for symptom-targeting in the treatment of Tourette syndrome since all available treatments are symptomatic and not disease modifying. © The Royal Australian and New Zealand College of Psychiatrists 2015.Australian and New Zealand Journal of Psychiatry 07/2015; DOI:10.1177/0004867415594429 · 3.77 Impact Factor
[Show abstract] [Hide abstract]
- "Today the field of application of DBS is expanding. For instance, DBS has recently been evaluated in clinical trials in patients suffering from treatment-resistant depression, and first-in-man studies have been conducted for the treatment of Tourette's syndrome (Anderson et al., 2012; Cannon et al., 2012). Despite positive clinical results, the understanding of the mechanisms of action underlying the therapeutic effects of DBS is still a matter of debate (Grill and McIntyre, 2001; Volkmann, 2004; Anderson et al., 2012). "
ABSTRACT: Synchronization of populations of neurons is a hallmark of several brain diseases. Coordinated reset (CR) stimulation is a model-based stimulation technique which specifically counteracts abnormal synchrony by desynchronization. Electrical CR stimulation, e.g., for the treatment of Parkinson's disease (PD), is administered via depth electrodes. In order to get a deeper understanding of this technique, we extended the top-down approach of previous studies and constructed a large-scale computational model of the respective brain areas. Furthermore, we took into account the spatial anatomical properties of the simulated brain structures and incorporated a detailed numerical representation of 2 · 10(4) simulated neurons. We simulated the subthalamic nucleus (STN) and the globus pallidus externus (GPe). Connections within the STN were governed by spike-timing dependent plasticity (STDP). In this way, we modeled the physiological and pathological activity of the considered brain structures. In particular, we investigated how plasticity could be exploited and how the model could be shifted from strongly synchronized (pathological) activity to strongly desynchronized (healthy) activity of the neuronal populations via CR stimulation of the STN neurons. Furthermore, we investigated the impact of specific stimulation parameters especially the electrode position on the stimulation outcome. Our model provides a step forward toward a biophysically realistic model of the brain areas relevant to the emergence of pathological neuronal activity in PD. Furthermore, our model constitutes a test bench for the optimization of both stimulation parameters and novel electrode geometries for efficient CR stimulation.Frontiers in Computational Neuroscience 11/2014; 8:154. DOI:10.3389/fncom.2014.00154 · 2.23 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: Deep brain stimulation (DBS) remains an experimental but promising treatment for patients with severe refractory Gilles de la Tourette syndrome (TS). Controversial issues include the selection of patients (age and clinical presentation), the choice of brain targets to obtain optimal patient-specific outcomes, and the risk of surgery- and stimulation-related serious adverse events. This report describes our open-label experience with eight patients with severe refractory malignant TS treated with DBS. The electrodes were placed in the midline thalamic nuclei or globus pallidus, pars internus, or both. Tics were clinically assessed in all patients pre- and postoperatively using the Modified Rush Video Protocol and the Yale Global Tic Severity Scale (YGTSS). Although three patients had marked postoperative improvement in their tics (>50% improvement on the YGTSS), the majority did not reach this level of clinical improvement. Two patients had to have their DBS leads removed (one because of postoperative infection and another because of lack of benefit). Our clinical experience supports the urgent need for more data and refinements in interventions and outcome measurements for severe, malignant, and medication-refractory TS. Because TS is not an etiologically homogenous clinical entity, the inclusion criteria for DBS patients and the choice of brain targets will require more refinement.11/2013; 3.