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https://www.readbyqxmd.com/read/28231479/intermittent-bilateral-coherence-in-physiological-and-essential-hand-tremor
#1
Soma Chakraborty, Jana Kopecká, Otakar Šprdlík, Martina Hoskovcová, Olga Ulmanová, Evžen Růžička, Martin Zapotocky
OBJECTIVE: To investigate the prevalence and the temporal structure of bilateral coherence in physiological (PT) and essential (ET) hand tremor. METHODS: Triaxial accelerometric recordings from both hands in 30 healthy subjects and 34 ET patients were analyzed using spectral coherence and wavelet coherence methods. In 12 additional healthy subjects, the relation between the hand tremor and the chest wall acceleration was evaluated using partial coherence analysis...
January 14, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28229302/tremor-analysis-separates-parkinson-s-disease-and-dopamine-receptor-blockers-induced-parkinsonism
#2
Aasef G Shaikh
Parkinson's disease, the most common cause of parkinsonism is often difficult to distinguish from its second most common etiology due to exposure to dopamine receptor blocking agents such as antiemetics and neuroleptics. Dual axis accelerometry was used to quantify tremor in 158 patients with parkinsonism; 62 had Parkinson's disease and 96 were clinically diagnosed with dopamine receptor blocking agent-induced parkinsonism. Tremor was measured while subjects rested arms (resting tremor), outstretched arms in front (postural tremor), and reached a target (kinetic tremor)...
February 22, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28229063/childhood-laryngeal-dystonia-following-bilateral-globus-pallidus-abnormality-a-case-study-and-review-of-literature
#3
Mohammad Javad Saeedi Borujeni, Ebrahim Esfandiary, Mostafa Almasi-Dooghaee
INTRODUCTION: Dystonia is a disorder of movement caused by various etiologies. Laryngeal dystonia is caused by the spasm of laryngeal muscles. It is a disorder caused by vocal fold movement in which excessive adduction or abduction of the vocal folds occurs during speech. The pathophysiology of this type of dystonia is not fully known. Some researchers have suggested that basal ganglia structures and their connections with cortical areas have been involved in the pathogenesis of dystonia...
January 2017: Iranian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28227972/support-vector-machine-classification-of-parkinson-s-disease-and-essential-tremor-subjects-based-on-temporal-fluctuation
#4
Decho Surangsrirat, Chusak Thanawattano, Ronachai Pongthornseri, Songphon Dumnin, Chanawat Anan, Roongroj Bhidayasiri, Decho Surangsrirat, Chusak Thanawattano, Ronachai Pongthornseri, Songphon Dumnin, Chanawat Anan, Roongroj Bhidayasiri, Ronachai Pongthornseri, Roongroj Bhidayasiri, Songphon Dumnin, Chanawat Anan, Chusak Thanawattano, Decho Surangsrirat
Tremor is a common symptom shared in both Parkinson's disease (PD) and Essential tremor (ET) subjects. The differential diagnosis of PD and ET tremor is important since the realization of treatment depends on specific medication. A novel feature is developed based on a hypothesis that tremor of PD subject has a larger fluctuation during resting than action task. Tremor signal is collected using a triaxial gyroscope sensor attached to subject's finger during kinetic and resting task. The angular velocity signal is analyzed by transforming a one-dimensional to two-dimensional signal using a relation of signal and its delay versions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227918/longitudinal-wearable-tremor-measurement-system-with-activity-recognition-algorithms-for-upper-limb-tremor
#5
Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim
Assessments of tremor characteristics by movement disorder physicians are usually done at single time points in clinic settings, so that the description of the tremor does not take into account the dependence of the tremor on specific behavioral situations. Moreover, treatment-induced changes in tremor or behavior cannot be quantitatively tracked for extended periods of time. We developed a wearable tremor measurement system with tremor and activity recognition algorithms for long-term upper limb behavior tracking, to characterize tremor characteristics and treatment effects in their daily lives...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227851/design-and-validation-of-a-high-order-weighted-frequency-fourier-linear-combiner-based-kalman-filter-for-parkinsonian-tremor-estimation
#6
Y Zhou, M E Jenkins, M D Naish, A L Trejos, Y Zhou, M E Jenkins, M D Naish, A L Trejos, M E Jenkins, M D Naish, Y Zhou, A L Trejos
The design of a tremor estimator is an important part of designing mechanical tremor suppression orthoses. A number of tremor estimators have been developed and applied with the assumption that tremor is a mono-frequency signal. However, recent experimental studies have shown that Parkinsonian tremor consists of multiple frequencies, and that the second and third harmonics make a large contribution to the tremor. Thus, the current estimators may have limited performance on estimation of the tremor harmonics...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227685/graphical-user-interface-for-a-robotic-workstation-in-a-surgical-environment
#7
A Bielski, C P Lohmann, M Maier, D Zapp, M A Nasseri, A Bielski, C P Lohmann, M Maier, D Zapp, M A Nasseri, M A Nasseri, M Maier, D Zapp, C P Lohmann, A Bielski
Surgery using a robotic system has proven to have significant potential but is still a highly challenging task for the surgeon. An eye surgery assistant has been developed to eliminate the problem of tremor caused by human motions endangering the outcome of ophthalmic surgery. In order to exploit the full potential of the robot and improve the workflow of the surgeon, providing the ability to change control parameters live in the system as well as the ability to connect additional ancillary systems is necessary...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227636/a-system-to-monitor-tremors-in-patients-with-parkinson-s-disease
#8
A Bermeo, M Bravo, M Huerta, A Soto, A Bermeo, M Bravo, M Huerta, A Soto, A Bermeo, M Huerta, A Soto, M Bravo
In this work the design and development of a system to monitor tremors in patients with Parkinson's disease based on Arduino open-source prototyping platform is presented. For processing data tremors acquired by the sensor device we have developed an Android application which allows an evaluation of the state of PD patients based on three types of tests that are in the Unified Parkinson's Disease Rating Scale recommended by the Movement Disorder Society (MDS-UPDRS); the tests performed in the application are: postural tremor of the hands, kinetic tremors of the hands and resting tremor amplitude...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227320/three-dimensional-modeling-of-physiological-tremor-for-hand-held-surgical-robotic-instruments
#9
Sivanagaraja Tatinati, Yan Naing Aye, Anand Pual, Wei Tech Ang, Kalyana C Veluvolu, Sivanagaraja Tatinati, Yan Naing Aye, Anand Pual, Wei Tech Ang, Kalyana C Veluvolu, Sivanagaraja Tatinati, Anand Pual, Wei Tech Ang, Yan Naing Aye, Kalyana C Veluvolu
Hand-held robotic instruments are developed to compensate physiological tremor in real-time while augmenting the required precision and dexterity into normal microsurgical work-flow. The hardware (sensors and actuators) and software (causal linear filters) employed for tremor identification and filtering introduces time-varying unknown phase-delay that adversely affects the device performance. The current techniques that focus on three-dimensions (3D) tip position control involves modeling and canceling the tremor in 3-axes (x, y, and z axes) separately...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227304/tremor-updrs-estimation-in-home-environment
#10
George Rigas, Dimitris Gatsios, Dimitrios I Fotiadis, Maria Chondrogiorgi, Christos Tsironis, Spyridon Konitsiotis, Giovanni Gentile, Andrea Marcante, Angelo Antonini, George Rigas, Dimitris Gatsios, Dimitrios I Fotiadis, Maria Chondrogiorgi, Christos Tsironis, Spyridon Konitsiotis, Giovanni Gentile, Andrea Marcante, Angelo Antonini, Giovanni Gentile, Andrea Marcante, Dimitrios I Fotiadis, Dimitris Gatsios, Angelo Antonini, Christos Tsironis, Spyridon Konitsiotis, George Rigas, Maria Chondrogiorgi
In this paper, a method for the assessment of the Unified Parkinson Disease Rating scale (UPDRS) related to tremor is presented. The method described consists of hand resting and posture state detection, tremor detection and tremor quantification based on accelerometer and gyroscope readings from a wrist worn sensor. The initial results on PD patient recordings on home environment indicate the feasibility of the proposed method in monitoring UPDRS tremor in patient home environment.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226979/quantitative-assessment-of-arm-tremor-in-people-with-neurological-disorders
#11
Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim
Abnormal oscillatory movement (i.e. tremor) is usually evaluated with qualitative assessment by clinicians, and quantified with subjective scoring methods. These methods are often inaccurate. We utilized a quantitative and standardized task based on the Fitts' law to assess the performance of arm movement with tremor by controlling a gyration mouse on a computer. The experiment included the center-out tapping (COT) and rectangular track navigation (RTN) tasks. We report the results of a pilot study in which we collected the performance for healthy participants in whom tremor was simulated by imposing oscillatory movements to the arm with a vibration motor...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226950/prediction-of-posture-dependent-tremor-by-the-calculation-of-the-endpoint-compliance
#12
Takuya Murata, Kouhei Sakurada, Toshio Tsuji, Yuichi Kurita, Takuya Murata, Kouhei Sakurada, Toshio Tsuji, Yuichi Kurita, Kouhei Sakurada, Takuya Murata, Toshio Tsuji, Yuichi Kurita
This paper proposes to use the analysis of human mechanical impedance to predict spatial behavior of tremor. Traditional studies have revealed that the variability in force is proportional to the mean level of force generated, which is described as signal dependent noise. The variability in force sometimes generates unintentional and uncontrollable rhythmic muscle movements, called tremor. Tremor appears most commonly on arms and hands due to not only a symptom of a neurological disorder, but also when we tighten our muscles...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226867/qapd-an-integrated-system-to-quantify-symptoms-of-parkinson-s-disease
#13
Vrajeshri Patel, Martin Burns, Michael Pourfar, Alon Mogilner, Douglas Kondziolka, Ramana Vinjamuri, Vrajeshri Patel, Martin Burns, Michael Pourfar, Alon Mogilner, Douglas Kondziolka, Ramana Vinjamuri, Douglas Kondziolka, Ramana Vinjamuri, Martin Burns, Alon Mogilner, Michael Pourfar, Vrajeshri Patel
The complex prevalence of Parkinson's disease (PD) symptoms has pushed research towards assessment tools that can assist in their quantification. There remains a need for a system capable of measuring symptoms during various tasks at multiple motor levels (kinematics and electromyography). In this paper, we present the development and initial validation of a quantitative assessment tool for Parkinson's disease (QAPD), a system designed to assist researchers and clinicians in the study of PD. The system integrates motion tracking, data gloves, and electromyography to collect movement related data from multiple body parts...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226861/improved-electrode-material-for-deep-brain-stimulation
#14
A Petrossians, J J Whalen, J D Weiland, A Petrossians, J J Whalen, J D Weiland, J J Whalen, A Petrossians, J D Weiland
Deep brain stimulation (DBS) devices have been implanted for treatment of basic tremor, Parkinson's disease and dystonia. These devices use electrodes in contact with tissue to deliver electrical pulses to targeted cells, to elicit specific therapeutic responses. In general, the neuromodulation industry has been evolving towards smaller, less invasive electrodes. However, current electrode materials do not support small sizes without severely restricting the stimulus output. Hence, an improved electrode material will benefit present and future DBS systems...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226857/development-of-a-closed-loop-system-for-tremor-suppression-in-patients-with-parkinson-s-disease
#15
F L Xu, M Z Hao, S Q Xu, Z X Hu, Q Xiao, N Lan, F L Xu, M Z Hao, S Q Xu, Z X Hu, Q Xiao, N Lan, S Q Xu, Z X Hu, Q Xiao, M Z Hao, N Lan, F L Xu
More than 70% of patients suffering Parkinson's disease (PD) exhibit resting tremor in their extremities, hampering their ability to perform daily activities. Based on our earlier studies on corticospinal transmission of tremor signals [10,11], we hypothesize that cutaneous afferents evoked by surface stimulation can produce an inhibitory effect on propriospinal neurons (PN), which in turn will suppress tremor signals passing through the PN. This paper presents the development of a closed-loop system for tremor suppression by transcutaneous electrical nerve stimulation (TENS) of sensory fibers beneath the skin...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226587/combined-accelerometer-and-emg-analysis-to-differentiate-essential-tremor-from-parkinson-s-disease
#16
Nooshin Haji Ghassemi, Franz Marxreiter, Cristian F Pasluosta, Patrick Kugler, Johannes Schlachetzki, Axel Schramm, Bjoern M Eskofier, Jochen Klucken, Nooshin Haji Ghassemi, Franz Marxreiter, Cristian F Pasluosta, Patrick Kugler, Johannes Schlachetzki, Axel Schramm, Bjoern M Eskofier, Jochen Klucken, Johannes Schlachetzki, Nooshin Haji Ghassemi, Cristian F Pasluosta, Patrick Kugler, Franz Marxreiter, Axel Schramm, Bjoern M Eskofier, Jochen Klucken
In this study, we intended to differentiate patients with essential tremor (ET) from tremor dominant Parkinson disease (PD). Accelerometer and electromyographic signals of hand movement from standardized upper extremity movement tests (resting, holding, carrying weight) were extracted from 13 PD and 11 ET patients. The signals were filtered to remove noise and non-tremor high frequency components. A set of statistical features was then extracted from the discrete wavelet transformation of the signals. Principal component analysis was utilized to reduce dimensionality of the feature space...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224712/a-novel-astrovirus-associated-with-encephalitis-and-ganglionitis-in-domestic-sheep
#17
F Pfaff, K Schlottau, S Scholes, A Courtenay, B Hoffmann, D Höper, M Beer
In June 2013, a 4-year-old Welsh Mountain ewe and in March 2014 a 10-day-old lamb of the same breed and the same flock presented progressive neurological signs including depressed sensorium, tremor, and unusual behaviour. Neuropathological examination of the brain and spinal cord detected non-suppurative polioencephalomyelitis and dorsal root ganglionitis, characteristic of a neurotropic viral agent in both sheep. Metagenomic analysis of different tissue samples from both animals identified a novel Ovine Astrovirus (OvAstV)...
February 22, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28220747/three-cases-of-neurologic-syndrome-caused-by-donor-derived-microsporidiosis
#18
Rachel M Smith, Atis Muehlenbachs, Joanna Schaenmann, Sanjiv Baxi, Sophia Koo, Dianna Blau, Peter Chin-Hong, Anna R Thorner, Matthew J Kuehnert, Kristina Wheeler, Alexis Liakos, Jonathan W Jackson, Theresa Benedict, Alexandre J da Silva, Jana M Ritter, Dominique Rollin, Maureen Metcalfe, Cynthia S Goldsmith, Govinda S Visvesvara, Sridhar V Basavaraju, Sherif Zaki
In April 2014, a kidney transplant recipient in the United States experienced headache, diplopia, and confusion, followed by neurologic decline and death. An investigation to evaluate the possibility of donor-derived infection determined that 3 patients had received 4 organs (kidney, liver, heart/kidney) from the same donor. The liver recipient experienced tremor and gait instability; the heart/kidney and contralateral kidney recipients were hospitalized with encephalitis. None experienced gastrointestinal symptoms...
March 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28219749/behavioral-phenotypes-associated-with-mptp-induction-of-partial-lesions-in-common-marmosets-callithrix-jacchus
#19
Kimberley A Phillips, Corinna N Ross, Jennifer Spross, Catherine J Cheng, Alyssa Izquierdo, K C Biju, Cang Chen, Senlin Li, Suzette D Tardif
Parkinson's disease is a chronic neurodegenerative disorder with the core motor features of resting tremor, bradykinesia, rigidity, and postural instability. Non-motor symptoms also occur, and include cognitive dysfunction, mood disorders, anosmia (loss of smell), and REM sleep disturbances. As the development of medications and other therapies for treatment of non-motor symptoms is ongoing, it is essential to have animal models that aid in understanding the neural changes underlying non-motor PD symptoms and serve as a testing ground for potential therapeutics...
February 17, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28218270/magma-plumbing-system-and-seismicity-of-an-active-mid-ocean-ridge-volcano
#20
Florian Schmid, Vera Schlindwein, Ivan Koulakov, Aline Plötz, John-Robert Scholz
At mid-ocean ridges volcanism generally decreases with spreading rate but surprisingly massive volcanic centres occur at the slowest spreading ridges. These volcanoes can host unexpectedly strong earthquakes and vigorous, explosive submarine eruptions. Our understanding of the geodynamic processes forming these volcanic centres is still incomplete due to a lack of geophysical data and the difficulty to capture their rare phases of magmatic activity. We present a local earthquake tomographic image of the magma plumbing system beneath the Segment 8 volcano at the ultraslow-spreading Southwest Indian Ridge...
February 20, 2017: Scientific Reports
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