Deep brain stimulation in patients with long history of drug resistant epilepsy and poor functional status: Outcomes based on the different targets.

BACKGROUND: Deep brain stimulation (DBS) is a widely used surgical procedure for the treatment of patients with drug resistant epilepsy (DRE) and several anatomical target have been described. Indications for DBS includes patients with focal, partial seizure and those for which resective or disconnective surgery are contraindicated, such as involvement of eloquent cortex or significant comorbidities. Despite the SANTE trial has clearly indicated the efficacy of DBS of anterior nucleus of the thalamus (ANT), specific indications regarding the best anatomical target and outcome in patients with severe disability are lacking. Here we described our case series of patients underwent DBS of three different target including ANT, centromedian thalamic nucleus (CMN) and subthalamic nucleus (STN). METHOD: Six patients with DRE have been treated with DBS of ANT (n = 3), STN (n = 2) and CMN (n = 1). Outcome has been expressed as seizures frequency reduction and patients functional status after surgery with a follow-up of 5-11 years. RESULTS: Four out of six patients show no reduction of seizures frequency after DBS implant with one case of increasing atypical absence. Two cases, one ANT and one CMN, show a significant reduction of seizures frequency of 50-60%. No patients improve relative to functional outcome and one showed psychiatric symptoms worsening. CONCLUSIONS: For patients with DRE and severe functional disability, DBS may reduce seizure frequency in some cases, but it does not improve functional outcome.

Accuracy evaluation of the Kinect v2 sensor during dynamic movements in a rehabilitation scenario.

In this paper, the accuracy evaluation of the Kinect v2 sensor is investigated in a rehabilitation scenario. The accuracy analysis is provided in terms of joint positions and angles during dynamic postures used in low-back pain rehabilitation. Although other studies have focused on the validation of the accuracy in terms of joint angles and positions, they present results only considering static postures whereas the rehabilitation exercise monitoring involves to consider dynamic movements with a wide range of motion and issues related to the joints tracking. In this work, joint positions and angles represent clinical features, chosen by medical staff, used to evaluate the subject's movements. The spatial and temporal accuracy is investigated with respect to the gold standard, represented by a stereophotogrammetric system, characterized by 6 infrared cameras. The results provide salient information for evaluating the reliability of Kinect v2 sensor for dynamic postures.

Features and predictors of activity limitations and participation restriction 2 years after intensive rehabilitation following first-ever stroke.

BACKGROUND: Although stroke-related disability has been extensively studied, only few studies have investigated Participation restriction in chronic stroke survivors. AIM: To identify features and predictors of Activity limitation and Participation restriction in the chronic phase of a first-ever stroke. DESIGN: Cross-sectional observational study. SETTING: Comprehensive stroke unit with outpatient rehabilitation facility. POPULATION: Subjects submitted to intensive rehabilitation after first-ever stroke, from 1st January 2009 to 31st December 2010. METHODS: Participation was investigated through the Frenchay Activity Index (FAI) and the Functional Status Questionnaire (FSQ) at 2.4±0.5 years after the event. Basic activities of daily living (ADL) and mood were also assessed through the Modified Barthel Index (MBI) and the Beck Depression Inventory (BDI). A retrospective search of the medical records looked for: type/side of brain lesion, stroke clinical syndromes, comorbidities and functional condition at discharge from intensive rehabilitation (upper limb motricity index-ULMI-, Functional Ambulation Category-FAC, MBI, cognitive deficits). RESULTS: Forty-five subjects (17 female, age 70.1±11.5 years) were enrolled. They showed a striking restriction in their Participation, mainly for FAI-outdoor activities (median FAI score was <50% of the theoretical maximum). A poor gait function (FAC) and an impaired mood (BDI) were the only independent predictors of FAI indoor (F=6.1; p=,005; R^2= 64%) and outdoor activities (F=4.1; P=0.01; R^2=48%), respectively. The univariate analysis showed a strong dependence of all FSQ scores from global disability (MBI), motor function impairment (ULMI and FAC) and cognitive deficits. Depression influenced "psychological function" score, whereas gait capacity was the only factor significantly associated with the "work performance" score. The gait function level, achieved after intensive rehabilitation, was extrapolated by the multivariate analysis, as the most powerful independent predictor of the chronic activity limitations, as measured by MBI (F=33.8, P<0.0001, R2=0.539). CONCLUSION: Gait dysfunction is the main factor of Activity limitations and Participation restriction in chronic stroke. Participation is restricted by global disability, depression, older age and dementia. More than 50% variance of Participation measures cannot be explained by the quoted factors. CLINICAL REHABILITATION IMPACT: The study results support the need to integrate the standard rehabilitation approach with vocational rehabilitation in order to reduce Participation restriction.

A stereophotogrammetric-based method to assess spatio-temporal gait parameters on healthy and Parkinsonian subjects.

Generally, the study of gait requires the detection of successive heel contacts and toe-off instants. Traditional gait analysis methods obtain these gait events using dynamometric platforms together with stereophotogrammetric data. Usually, are kept valid only those walking trials where the subjects step on each platform by only one foot. For subjects suffering from walking impairments it is very difficult or sometimes impossible to walk naturally and step properly on the dynamometric platforms. The aim of the present study is to propose a new method to identify, in an automatic manner, the initial contact (IC) and the toe-off (TO) time instants using only stereophotogrammetric data and a classic gait analysis protocol. The assessment of spatio-temporal gait variables during natural walking is also performed. The study consisted in analyzing healthy and Parkinsonian elderly subjects. The reliability of the proposed stereophotogrammetric-based method was tested by direct comparison with the IC and TO instants determined by the dynamometric platform data. The absence of any statistically significant differences between the values estimated by the two different modalities, highlights the reliability of the proposed method in the assessment of these two gait events. Results underline, as expected, the reduction of walking velocity in pathological patients during free ambulation. The present study proposes this method as a valid alternative to the traditional technique that use dynamometric platforms to identify main gait events, for subjects unable to walk naturally and to step properly on the platforms.

A tool for home-based rehabilitation allowing for clinical evaluation in a visual markerless scenario.

This work deals with the design of an interactive monitoring tool for home-based physical rehabilitation. The software platform includes a video processing stage and the exercise performance evaluation. Image features are extracted by a Kinect v2 sensor and elaborated to return the exercises score. Furthermore the tool provides to physiotherapists a quantitative exercise evaluation of subject's performances. The proposed tool for home rehabilitation has been tested on 5 subjects and 5 different exercises and results are presented. In particular both exercises and relative evaluation indexes were selected by specialists in neurorehabilitation.

A randomised controlled cross-over trial of aerobic training versus Qigong in advanced Parkinson's disease.

AIM: To investigate the effects of an aerobic training in subjects with Parkinson's disease (PD) as compared to a medical Chinese exercise (Qigong). DESIGN: randomized controlled trial with a cross over design. SETTING: PD out-patients referred to a Neurorehabilitation facility for the management of motor disability. SUBJECTS: 26 PD patients in Hoehn and Yahr stage II to III under stable medication were randomly allocated to either Group AT1+QG2 (receiving 20 aerobic training sessions followed by 20 ''Qigong'' group sessions with 2 month interval between the interventions), or Group QG1+AT2 (performing the same treatments with an inverted sequence). MAIN OUTCOME MEASURES: clinical effects of treatment were sought through the Unified Parkinson's Disease Rating Scale (UPDRS), Brown's Disability Scale (B'DS), six-Minute Walking Test (6MWT), Borg scale for breathlessness, Beck Depression Inventory (BDI) and Parkinson's Disease Questionnaire-39 items (PDQ-39). A spirometry test and maximum cardiopulmonary exercise test (CPET) were also performed to determine the pulmonary function, the metabolic and cardio-respiratory requests at rest and under exercise. All measures were taken immediately before and at the completion of each treatment phase. RESULTS: The statistical analysis focusing on the evolution of motor disability and quality of life revealed a significant interaction effect between group and time for the 6MWT (time x group effect: F: 5.4 P=0.002) and the Borg scale (time x group effect: F: 4.2 P=0.009). Post hoc analysis showed a significant increase in 6MWT and a larger decrease in Borg score after aerobic training within each subgroup, whereas no significant changes were observed during Qigong. No significant changes over time were detected through the analysis of UPDRS, B'DS, BDI and PDQ-39 scores. The analysis of cardiorespiratory parameters showed significant interaction effects between group and time for the Double Productpeak (time x group effect: F: 7.7 P=0.0003), the VO(2peak) (time x group effect: F: 4.8 P=0.007), and the VO(2)/kg ratio (time x group effect: F: 4.3 P=0.009), owing to their decrease after aerobic training to an extent that was never observed after Qigong treatment. CONCLUSIONS: Aerobic training exerts a significant impact on the ability of moderately disabled PD patients to cope with exercise, although it does not improve their self-sufficiency and quality of life.

Functional improvement after subthalamic stimulation in Parkinson's disease: a non-equivalent controlled study with 12-24 month follow up.

OBJECTIVE: This study aimed to assess the effectiveness of chronic bilateral STN-S in improving the functional status of PD patients compared with patients treated with drugs alone. METHODS: Controlled study of disability index changes over 12 and 24 month chronic STN stimulation. Of 39 patients with advanced PD meeting CAPSIT criteria for STN-S, 23 underwent surgery; 16 patients decided against surgery and continued on drug schedule adjustments. Functional status was measured using the Activities of Daily Living section of the Unified Parkinson's Disease Rating Scale (UPDRS-ADL), Brown's Disability Scale, and Functional Independence Measure. UPDRS motor score and subscores for selected items, levodopa equivalent daily dose, and Beck Depression Inventory scores were also monitored. RESULTS: T12 follow up data were available for all 39 patients and T24 data for 13 STN-S and 8 control subjects. Compared with controls, STN-S patients experienced significant or highly significant improvements in all independence measures at both 12 and 24 months (time x treatment effect T12: F = 19.5, p = 0.00008; T24: F = 6.2, p = 0.005). Forward stepwise regression for independent predictors of the yearly rate of UPDRS-ADL score modification in the entire sample showed that treatment was the only factor significantly associated with functional status change (beta coefficient -0.54, t value -2.5, p = 0.02), whereas other variables-UPDRS motor score, BDI, and age at disease onset and enrolment-were not in the equation. CONCLUSION: STN-S is an effective therapeutic option in advanced PD. It induced a consistent improvement of functional abilities over two years to an extent that was not achieved with drug therapy alone.

Functional changes of the primary somatosensory cortex in patients with unilateral cerebellar lesions.

Although cerebellar lesions do not cause evident sensory deficits, it has been suggested recently that the cerebellum might play a role in sensory acquisition and discrimination. To determine whether the cerebellum influences the early phases of cortical somatosensory processing, we recorded cortical somatosensory evoked potentials after median nerve stimulation in five patients with unilateral cerebellar damage. We also performed a dipolar source analysis of traces by means of brain electrical source analysis. In all patients, the amplitude of the frontal N24 and parietal P24 components, as well as the strength of the corresponding dipolar sources, were significantly smaller after stimulation of the symptomatic side. These neurophysiological findings indicate that the primary somatosensory cortical processing is altered after contralateral cerebellar damage. They represent the first indication of a possible substrate for the reduction in cerebral blood flow observed in the parietal cortex after cerebellar lesion. Furthermore, the present data allow characterization of the functional influence of the cerebellar input to the primary somatosensory cortex as specifically acting over the inhibitory components of somatosensory processing.