Use of surface electromyography to assess and select patients with idiopathic dystonia for bilateral pallidal stimulation

2006 ◽  
Vol 105 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Shouyan Wang ◽  
Xuguang Liu ◽  
John Yianni ◽  
Alex L. Green ◽  
Carole Joint ◽  
...  
Keyword(s):  
Clinical Outcome ◽  
Surface Electromyography ◽  
Surface Emg ◽  
Spasmodic Torticollis ◽  
Rapid Improvement ◽  
Physiological Index ◽  
Pallidal Stimulation ◽  
Generalized Dystonia ◽  
Muscle Groups ◽  
Idiopathic Dystonia

Object The object of this study was to identify a preoperative physiological index by using surface electromyography (EMG) signals that would correlate with clinical outcome in dystonic patients following bilateral pallidal stimulation. Methods In 14 patients with spasmodic torticollis, generalized dystonia, and myoclonic dystonia, surface EMG signals were recorded from the most affected muscle groups. Although the dystonia affected different body segments, the EMG signals in all patients could be decomposed into bursting and sustained components. Subsequently, a ratio of the EMG amplitude was calculated between the two components and then correlated with clinical outcome. Patients who experienced rapid improvement following bilateral pallidal stimulation had a significantly higher EMG ratio compared with those who did not. Furthermore, a significant correlation was found between the EMG ratio and clinical improvement during the 12-month period following pallidal stimulation. Conclusions The authors concluded that surface EMG studies could be used to predict the clinical outcome of and to select patients for pallidal stimulation for dystonia.

scholarly journals Idiopathic dystonia clinical, profile of 76 brazilian patients

1992 ◽  
Vol 50 (4) ◽  
pp. 426-432 ◽  
Author(s):  
Luiz A. F. Andrade ◽  
Henrique B. Ferraz
Keyword(s):  
Age Of Onset ◽  
Spasmodic Torticollis ◽  
Adult Onset ◽  
Racial Origin ◽  
Body Distribution ◽  
Abnormal Movements ◽  
Segmental Dystonia ◽  
Generalized Dystonia ◽  
Male Patients ◽  
Idiopathic Dystonia

Dystonia may be classified by age of onset (childhood, adolescence, adult onset), body distribution of the abnormal movements (focal, segmental, unilateral, multifocal and generalized) and etiology (idiopathic and symptomatic). We studied 76 patients with idiopathic dystonia among 122; cases of dystonic syndrome (62.3% of the total). There were 48 female and 28 male patients. Adult-onset focal dystonia was the most frequent feature (37 patients). The onset of generalized dystonia was more frequently seen under the age of 20, whereas focal and segmental dystonia usually started over this age. Postural tremor of the hands was observed in 19.7% of the patients. Spasmodic torticollis was the most prevalent form of dystonia overall. Except for writer's cramp, which occurred more frequently in males, and generalized dystonia, which was equally divided between sexes, all other forms were more frequent in females. Our data suggest that differences in racial origin, social and economical status and environmental factors do not account for a different manifestation in dystonia pattern.

Severity and DYT1 status predict outcome after chronic bilateral pallidal stimulation in children and adolescents with primary generalized dystonia

2008 ◽  
Vol 39 (05) ◽  
Author(s):  
I Borggraefe ◽  
JH Mehrkens ◽  
M Telegravciska ◽  
S Berweck ◽  
K Bötzel ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
Pallidal Stimulation ◽  
Generalized Dystonia

GPi-pallidal stimulation to treat generalized dystonia in Cockayne syndrome

2010 ◽  
Vol 25 (5) ◽  
pp. 656-658 ◽  
Author(s):  
Kiyotoshi Hamasaki ◽  
Kazumichi Yamada ◽  
Tadashi Hamasaki ◽  
Jun-ichi Kuratsu
Keyword(s):  
Cockayne Syndrome ◽  
Pallidal Stimulation ◽  
Generalized Dystonia

scholarly journals Concurrent surface electromyography and force myography classification during times of prosthetic socket shift and user fatigue

2017 ◽  
Vol 4 ◽  
pp. 205566831770873 ◽  
Author(s):  
Joe Sanford ◽  
Rita Patterson ◽  
Dan O Popa
Keyword(s):  
Surface Electromyography ◽  
Muscle Activation ◽  
Surface Emg ◽  
Training Data ◽  
Control Input ◽  
Prosthetic Devices ◽  
Prosthetic Socket ◽  
User Fatigue ◽  
Force Myography

Objective Surface electromyography has been a long-standing source of signals for control of powered prosthetic devices. By contrast, force myography is a more recent alternative to surface electromyography that has the potential to enhance reliability and avoid operational challenges of surface electromyography during use. In this paper, we report on experiments conducted to assess improvements in classification of surface electromyography signals through the addition of collocated force myography consisting of piezo-resistive sensors. Methods Force sensors detect intrasocket pressure changes upon muscle activation due to changes in muscle volume during activities of daily living. A heterogeneous sensor configuration with four surface electromyography–force myography pairs was investigated as a control input for a powered upper limb prosthetic. Training of two different multilevel neural perceptron networks was employed during classification and trained on data gathered during experiments simulating socket shift and muscle fatigue. Results Results indicate that intrasocket pressure data used in conjunction with surface EMG data can improve classification of human intent and control of a powered prosthetic device compared to traditional, surface electromyography only systems. Significance Additional sensors lead to significantly better signal classification during times of user fatigue, poor socket fit, as well as radial and ulnar wrist deviation. Results from experimentally obtained training data sets are presented.

Wrist and Shoulder Muscle Activity Changes Across Computer Tasks

2002 ◽  
Vol 46 (13) ◽  
pp. 1129-1132 ◽  
Author(s):  
Jack Dennerlein ◽  
Maria-Helena DiMarino ◽  
Ted Becker ◽  
Peter Johnson
Keyword(s):  
Muscle Activity ◽  
Maximum Voluntary Contraction ◽  
Trapezius Muscle ◽  
Surface Emg ◽  
Voluntary Contraction ◽  
Office Work ◽  
Shoulder Muscle ◽  
Physical Risk Factors ◽  
Computer Workstation ◽  
Muscle Groups

The computer workstation is a ubiquitous tool in the office work environment; however, its use varies across many different tasks from surfing the Internet to typing. The question, therefore, is how does exposure to different physical risk factors for musculoskeletal disorders vary across tasks? Fifteen adults (10 females, 5 males) completed tasks simulating work at a computer workstation. The tasks were typing text, completing an html-based form, editing a document, a graphics task, and finally navigating through a series of web pages. During these tasks the muscle activity of the wrist prime movers and three shoulder muscle groups were recorded using surface EMG. For the wrist, the extensors were the most active ranging on average from 8 to 25 percent of Maximum Voluntary Contraction amplitude, with the greatest activity occurring in the typing task. The wrist activity decreased when the work changed from a keyboard-based activity to predominantly mouse-based activity. For the shoulder, the greatest activity was in the Trapezius muscle. The shoulder muscles were most active when both the mouse and the keyboard were required by the task. in summary, wrist and shoulder muscle activities at a computer workstation depend upon the type of task at hand.

Co-Contraction Recruitment and Spinal Load during Isometric Pushing Tasks

2005 ◽  
Vol 49 (14) ◽  
pp. 1330-1333 ◽  
Author(s):  
Kevin Granata ◽  
Patrick Lee ◽  
Tim Franklin
Keyword(s):  
Biomechanical Model ◽  
Neuromuscular Control ◽  
Surface Emg ◽  
Trunk Flexion ◽  
Materials Handling ◽  
Manual Materials Handling ◽  
Muscle Groups ◽  
Spinal Load ◽  
Theoretical Analyses ◽  
Flexion And Extension

Pushing and pulling tasks account for 20% of occupational low-back injury claims but few studies have investigated the neuromuscular control of the spine during these tasks. Primary torso muscle groups recruited during pushing tasks include the rectus abdominis and external obliques. However, theoretical analyses suggest that co-contraction of the paraspinal muscles is necessary to stabilize the spine during flexion exertions. A biomechanical model was implemented to estimate co-contraction and spinal load from measured surface EMG and trunk moment data recorded during trunk flexion and extension exertions. Results demonstrate that co-contraction during flexion exertions was approximately twice the value of co-contraction during extension. Co-contraction accounted for up to 47% of the total spinal load during flexion exertions and spinal load attributed to co-contraction was nearly 50% greater during flexion than during extension exertions despite similar levels of trunk moment. Results underscore the need to consider neuromuscular recruitment when evaluating biomechanical risks. Keywords: Spine; Co-contraction; Push; Manual Materials Handling; Biomechanics

DEEP BRAIN STIMULATION OF THE GLOBUS PALLIDUS FOR GENERALIZED DYSTONIA IN GM1 TYPE 3 GANGLIOSIDOSIS

Neurosurgery ◽  
2006 ◽  
Vol 59 (6) ◽  
pp. E1340-E1340 ◽  
Author(s):  
Emmanuel Roze ◽  
Soledad Navarro ◽  
Philippe Cornu ◽  
Marie-Laure Welter ◽  
Marie Vidailhet
Keyword(s):  
Globus Pallidus ◽  
Specific Treatment ◽  
Double Blind ◽  
Gm1 Gangliosidosis ◽  
Functional Benefit ◽  
Pallidal Stimulation ◽  
Independent Expert ◽  
Generalized Dystonia ◽  
Type 3

Abstract OBJECTIVE GM1 Type 3 gangliosidosis is a lysosomal storage disorder for which no specific treatment is available. It is characterized by progressive generalized dystonia, which is refractory to pharmacological treatment and results in severe disability and life-threatening complications. We performed bilateral pallidal stimulation in a patient with GM1 gangliosidosis and report the 12-month postoperative course. CLINICAL PRESENTATION A 24-year old woman presented with genetically confirmed GM1 gangliosidosis, resulting in severe progressive generalized dystonia. INTERVENTION Leads were implanted bilaterally into the internal part of the globus pallidus under stereotactic guidance. At follow-up visits, both the patient and the neurologists who performed the assessment were unaware of whether the neurostimulator was on or off. The patient was videotaped with a standardized protocol and scored by an independent expert. CONCLUSION After 1 year of follow-up, double-blind comparison of the patient's status with and without neurostimulation showed a 20% improvement, with a significant functional benefit, but no change in disease progression. Although further studies are needed to evaluate this therapeutic approach, this report suggests that pallidal stimulation might be a promising treatment for dystonia caused by GM1 Type 3 gangliosidosis.

scholarly journals COMPARATIVE ANALYSIS OF SURFACE ELECTROMYOGRAPHY DATA IN PATIENTS WITH CHRONIC DAILY HEADACHE AFTER BOTULOTOXIN INJECTION TYPE A AND STANDARD MEDICAL THERAPY

InterConf ◽  
2021 ◽  
pp. 377-386
Author(s):  
Anna Prokhorova
Keyword(s):  
Medical Therapy ◽  
Chronic Daily Headache ◽  
Surface Electromyography ◽  
Type A ◽  
Surface Emg ◽  
Standard Medical Therapy ◽  
Group I ◽  
Significant Difference ◽  
Before And After ◽  
Daily Headache

Goal. The aim of the study was to compare the results of surface electromyography after injection of Botulinum toxin type A and standard medical therapy. Material and methods. The study encompassed 62 participants with chronic daily headaches (CDH). Group I included 26 patients with chronic migraine (15 treated with BTX-A injection and 11 treated with standard medical therapy), whilst, Group II comprised of 36 patients with chronic tension type headache (20 treated with BTX-A injection and 16 treated with standard medical therapy) with an average age of 32.1 ± 10.3 (M ± SD) years. Before and after therapy, clinical questionnaires, instrumental data, and headache episode characteristics were collected from all patients. To examine the differences between BTX - A injection and standard medical therapy, we measured muscle activity with surface EMG in patients with chronic daily headache before and after 3 months of treatment. On days when the patients had no headache attacks, the surface EMG was measured. Results. After treatment, surface electromyography data revealed a statistically significant difference in outcomes between the patients who received BTX-A injection and those who received standard medical therapy. Before treatment on surface EMG, all patients with chronic daily headache had high amplitude and velocity in the muscles under study, and there was no statistically significant difference between these groups, where p => 0.05. In this study, it was discovered that there was no statistically significant difference in pericranial and neck muscles dysfunction (before treatment between patients receiving BTX-A injection and standard medical therapy in Group I, patients with CM 95% CI -0.9087 - 0.4887; t = -0.607, df = 40, p = 0.5470 and Group II, patients with CTTH 95 % CI -0.5756 - 0.4356, t = -0.27, After treatment, there was a statistically significant difference between groups treated by BTX- A injection and standard medical therapy, with CM 95% CI 0.3258 - 1.4142, t = 3.231, df = 40, p = 0.0025 and CTTH 95 % CI 0.1020 - 1.1780, t = 2.381, df = 58, p = 0.0206, where p = <0.05. Conclusion. The obtained results testify the effectiveness of BTX-A injections compared to standard medical therapy in patients with CDH.

scholarly journals Could Relative Movement Between the Adductor Muscles and the Skin Invalidate Surface Electromyography Measurement?

2020 ◽  
Vol 36 (5) ◽  
pp. 319-325 ◽  
Author(s):  
Walaa M. Elsais ◽  
Stephen J. Preece ◽  
Richard K. Jones ◽  
Lee Herrington
Keyword(s):  
Surface Electromyography ◽  
Surface Emg ◽  
Ultrasound Measurement ◽  
Relative Movement ◽  
Adductor Muscles ◽  
Flexion Extension ◽  
Close Proximity ◽  
Electrode Positioning ◽  
Hip Flexion ◽  
Emg Electrodes

The superficial hip adductor muscles are situated in close proximity to each other. Therefore, relative movement between the overlying skin and the muscle belly could lead to a shift in the position of surface electromyography (EMG) electrodes and contamination of EMG signals with activity from neighboring muscles. The aim of this study was to explore whether hip movements or isometric contraction could lead to relative movement between the overlying skin and 3 adductor muscles: adductor magnus, adductor longus, and adductor gracilis. The authors also sought to investigate isometric torque–EMG relationships for the 3 adductor muscles. Ultrasound measurement showed that EMG electrodes maintained a position which was at least 5 mm within the muscle boundary across a range of hip flexion–extension angles and across different contraction levels. The authors also observed a linear relationship between torque and EMG amplitude. This is the first study to use ultrasound to track the relative motion between skin and muscle and provides new insight into electrode positioning. The findings provide confidence that ultrasound-based positioning of EMG electrodes can be used to derive meaningful information on output from the adductor muscles and constitute a step toward recognized guidelines for surface EMG measurement of the adductors.

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