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https://www.readbyqxmd.com/read/28813815/how-do-strength-and-coordination-recovery-interact-after-stroke-a-computational-model-for-informing-robotic-training
#1
Sumner L Norman, Joan Lobo-Prat, David J Reinkensmeyer
Robotic devices can train strength, coordination, or a combination of both. If a robotic device focuses on coordination, what happens to strength recovery, and vice versa? Understanding this interaction could help optimize robotic training. We developed a computational neurorehabilitation model to gain insight into the interaction between strength and coordination recovery after stroke. In the model, the motor system recovers by optimizing the activity of residual corticospinal cells (focally connected, excitatory and inhibitory) and reticulospinal cells (diffusely connected and excitatory) to achieve a motor task...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813809/development-of-elbow-spasticity-model-for-objective-training-of-spasticity-assessment-of-patients-post-stroke
#2
Jeong-Ho Park, Kwang-Jae Lee, Yong-Soon Yoon, Eun-Ji Son, Ji-Sun Oh, Si Hyun Kang, Heesang Kim, Hyung-Soon Park
Reliable assessment is essential for the management of spasticity, one of the most frequent complication of various neurological diseases. For the spasticity assessment, several clinical tools have been developed and widely used in clinics. The most popular one is modified Ashworth scale (MAS). It has a simple protocol, but is subjective and qualitative. To improve its reliability, quantitative measurement and consistent training would be needed. This study presents an elbow spasticity simulator which mimics spastic response of adult post stroke survivors...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812990/human-leukocyte-antigen-c-12-02-02-and-killer-immunoglobulin-like-receptor-2dl5-are-distinctly-associated-with-ankylosing-spondylitis-in-the-taiwanese
#3
Chin-Man Wang, Sheng-Hung Wang, Yeong-Jian Jan Wu, Jing-Chi Lin, Jianming Wu, Ji-Yih Chen
Human leukocyte antigen (HLA) class I ligands and Killer immunoglobulin-like receptors (KIRs) regulate the cytolytic activity of natural killer (NK) cells and certain T cells. We examined their genetic predisposition to disease susceptibility and clinical phenotypes in Taiwanese ankylosing spondylitis (AS) patients. KIR genotyping and Human Leucocyte Antigen C (HLA-C) sequencing were performed in 653 Taiwanese AS patients and 952 healthy controls. KIR genotype distributions and HLA-C allele frequencies were compared in patients and controls and among patients with and without HLA-B27 positivity, early age onset and spinal syndesmophytes...
August 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28812573/adjusting-diet-outcome-associations-for-random-error-comparison-of-associations-based-on-observed-and-estimated-usual-intakes
#4
E Verly-Jr, R Sichieri, V T Baltar
BACKGROUND/OBJECTIVES: To compare linear regression coefficients adjusted for random errors with true coefficients. SUBJECTS/METHODS: Three hundred and two individuals from the city of Rio de Janeiro, Brazil answered 20 non-consecutive 24-hr. Means of 20 24-hr were used as an approximation of the usual dietary intakes. It was simulated outcomes with pre-defined linear regression coefficient (β=1.0, referred as 'true coefficient') for usual coffee and soft-drink intakes as explanatory variables controlled for sex and age...
August 16, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28812230/simulation-of-left-ventricular-dynamics-using-a-low-order-mathematical-model
#5
Michael J Moulton, Brian D Hong, Timothy W Secomb
The eventual goal of this study is to develop methods for estimating dynamic stresses in the left ventricle (LV) that could be used on-line in clinical settings, based on routinely available measurements. Toward this goal, a low-order theoretical model is presented, in which LV shape is represented using a small number of parameters, allowing rapid computational simulations of LV dynamics. The LV is represented as a thick-walled prolate spheroid containing helical muscle fibers with nonlinear passive and time-dependent active contractile properties...
August 15, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28812044/monte-carlo-simulations-of-randomized-clinical-trials-in-epilepsy
#6
Daniel M Goldenholz, Joseph Tharayil, Robert Moss, Evan Myers, William H Theodore
BACKGROUND: The placebo response in epilepsy randomized clinical trials (RCTs) has recently been shown to largely reflect underlying natural variability in seizure frequency. Based on this observation, we sought to explore the parameter space of RCT design to optimize trial efficiency and cost. METHODS: We used one of the world's largest patient reported seizure diary databases, SeizureTracker.com to derive virtual patients for simulated RCTs. We ran 1000 randomly generated simulated trials using bootstrapping (sampling with replacement) for each unique combination of trial parameters, sweeping a large set of parameters in durations of the baseline and test periods, number of patients, eligibility criteria, drug effect size, and patient dropout...
August 2017: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/28811773/transepithelial-corneal-crosslinking-in-treatment-of-progressive-keratoconus-12-months-clinical-results
#7
Bushra Akbar, Rana Intisar-Ul-Haq, Mazhar Ishaq, Sabahat Arzoo, Kashif Siddique
OBJECTIVE: The purpose of this study was to evaluate the safety and efficacy of transepithelial corneal collagen cross linking (TE-CXL) with modified riboflavin and accelerated UVA irradiance in thin corneas with pachymetry less than 400 microns at thinnest point, untreatable by epithelium off corneal collagen cross linking (CXL) in adult Pakistani population with progressive keratoconus. METHODS: This quasi experimental study included twenty six eyes of 26 patients with progressive keratoconus who underwent accelerated transepithelial CXL in Armed forced institute of ophthalmology with 12 months follow up...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28811246/microbial-metagenomics-mock-scenario-based-sample-simulation-m3s3
#8
Yair Motro, Jacob Moran-Gilad
OBJECTIVES: Shotgun sequencing in increasingly applied in clinical microbiology for unbiased culture-independent diagnosis. While software solutions for metagenomics proliferate, integration of metagenomics in clinical care, requires method standardisation and validation. Virtual metagenomics samples could underpin validation by substituting real samples and thus we sought to develop a novel solution for simulation of metagenomics samples based on user-defined clinical scenarios. METHODS: We designed the Microbial Metagenomics Mock Scenario-based Sample Simulation (M3S3) workflow, which allows users to generate virtual samples from raw reads or assemblies...
August 12, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28810931/a-comprehensive-regional-clinical-and-educational-ecpr-protocol-decreases-time-to-ecmo-in-patients-with-refractory-out-of-hospital-cardiac-arrest
#9
Brian Grunau, Sarah Carrier, Jamil Bashir, William Dick, Luke Harris, Robert Boone, Dan Kalla, Frank Scheuermeyer, Brian Twaites, Ron Straight, James Abel, Ken McDonald, Ruth MacRedmond, David Agulnik, Joe Finkler, Jeanne MacLeod, Jim Christenson, Anson Cheung
OBJECTIVE: Extracorporeal membrane oxygenation within CPR (ECPR) may improve survival for refractory out-of-hospital cardiac arrest (OHCA). We developed a prehospital, emergency department (ED), and hospital-based clinical and educational protocol to improve the key variable of time-to-ECPR (TTE). METHODS: In a single urban health region we involved key prehospital, clinical, and administrative stakeholders over a 2-year period, to develop a regional ECPR program with destination to a single urban tertiary care hospital...
August 16, 2017: CJEM
https://www.readbyqxmd.com/read/28810853/acute-effects-of-reducing-sitting-time-in-adolescents-a-randomized-cross-over-study
#10
Anisse Penning, Anthony D Okely, Stewart G Trost, Jo Salmon, Dylan P Cliff, Marijka Batterham, Steven Howard, Anne-Maree Parrish
BACKGROUND: Levels of sitting among adolescents are high, especially during the school day. The acute cognitive and health consequences associated with prolonged sitting are poorly understood in adolescents. This randomized crossover design study examined the acute effects of a simulated school day with reduced sitting or usual sitting on adolescents' cognitive function and cardiometabolic biomarkers. METHODS: Eighteen healthy school aged adolescents were recruited from the community to the study (11 males; 7 females; mean age [SD] = 13...
August 15, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28809759/independent-dose-verification-system-with-monte-carlo-simulations-using-topas-for-passive-scattering-proton-therapy-at-the-national-cancer-center-in-korea
#11
Wook-Geun Shin, Mauro Testa, Hak Soo Kim, Jong Hwi Jeong, Se Byeong Lee, Yeon-Joo Kim, Chul Hee Min
For the independent validation of treatment plans, we developed a Monte Carlo (MC)-based patient dose calculation system with the tool for particle simulation (TOPAS) to enable routine and automatic dose recalculation for each patient. The proton beam nozzle was modeled with TOPAS to simulate the therapeutic beam, and MC commissioning was performed by comparing percent depth dose with the measurement. The beam set-up based on the prescribed beam range and modulation width was automated by modifying the vendor-specific method...
August 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28809681/a-prototype-therapy-system-for-transcutaneous-application-of-boiling-histotripsy
#12
Adam D Maxwell, Petr V Yuldashev, Wayne Kreider, Tatiana D Khokhlova, George R Schade, Timothy L Hall, Oleg A Sapozhnikov, Michael R Bailey, Vera A Khokhlova
Boiling histotripsy is a method of focused ultrasound surgery that noninvasively applies millisecond-length pulses with high-amplitude shock fronts to generate liquefied lesions in tissue. Such a technique requires unique outputs compared to a focused ultrasound thermal therapy apparatus, particularly to achieve high in situ pressure levels through intervening tissue. This article describes the design and characterization of a system capable of producing the necessary pressure to transcutaneously administer boiling histotripsy therapy through clinically relevant overlying tissue paths using pulses with duration up to 10 ms...
August 14, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28809677/application-of-the-4d-xcat-phantoms-in-biomedical-imaging-and-beyond
#13
W Paul Segars, B M W Tsui, Jing Cai, Fang-Fang Yin, George S K Fung, Ehsan Samei
The four dimensional (4D) eXtended CArdiac-Torso (XCAT) series of phantoms was developed to provide accurate computerized models of the human anatomy and physiology. The XCAT series encompasses a vast population of phantoms of varying ages from newborn to adult, each including parameterized models for the cardiac and respiratory motions. With great flexibility in the XCAT's design, any number of body sizes, different anatomies, cardiac or respiratory motions or patterns, patient positions and orientations, and spatial resolutions can be simulated...
August 10, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28809639/the-effect-of-incorrect-foot-placement-on-the-accuracy-of-radiographic-measurements-of-the-hallux-valgus-and-inter-metatarsal-angles-for-treating-hallux-valgus
#14
E Kuyucu, H H Ceylan, S Surucu, I Erdil, A Kara, B G Gulenc, M Bulbul, M Erdil
PURPOSE OF THE STUDY Accurate radiographic measurements are crucial in treating hallux valgus (HV). This three-dimensional deformity should not be evaluated from one joint on one plane. However, in practice, surgeons measure the deformity only on transverse dorsoplantar radiographs. We determined the amount of error associated with positioning the foot incorrectly on radiographs. MATERIAL AND METHODS To simulate incorrect positions of the foot in radiographic evaluation, we designed an angled device that can move in transverse and frontal plane...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28809631/-comparison-between-the-range-of-movement-canine-real-cervical-spine-and-numerical-simulation-computer-model-validation
#15
R Srnec, Z Horák, R Sedláček, M Sedlinská, M Krbec, A Nečas
PURPOSE OF THE STUDY In developing new or modifying the existing surgical treatment methods of spine conditions an integral part of ex vivo experiments is the assessment of mechanical, kinematic and dynamic properties of created constructions. The aim of the study is to create an appropriately validated numerical model of canine cervical spine in order to obtain a tool for basic research to be applied in cervical spine surgeries. For this purpose, canine is a suitable model due to the occurrence of similar cervical spine conditions in some breeds of dogs and in humans...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28809203/clinical-simulation-a-protocol-for-evaluation-of-mobile-technology
#16
Carey Mather, Sanne Jensen, Elizabeth Cummings
For mobile technology to be accepted at point of care in healthcare environments there is a need to demonstrate benefits whilst ameliorating the risks and challenges. To provide a standardised approach to evaluation of mobile technology a simulation protocol was developed to provide guidance for its use in healthcare environments. Simulated conditions provide the opportunity to assess intended and unintended consequences and identify potential workarounds when using technology. The protocol can also be used to demonstrate the importance of the development of digital professionalism by end-users prior to students entering the clinical practice setting...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28808441/an-improved-extrapolation-scheme-for-truncated-ct-data-using-2d-fourier-based-helgason-ludwig-consistency-conditions
#17
Yan Xia, Martin Berger, Sebastian Bauer, Shiyang Hu, Andre Aichert, Andreas Maier
We improve data extrapolation for truncated computed tomography (CT) projections by using Helgason-Ludwig (HL) consistency conditions that mathematically describe the overlap of information between projections. First, we theoretically derive a 2D Fourier representation of the HL consistency conditions from their original formulation (projection moment theorem), for both parallel-beam and fan-beam imaging geometry. The derivation result indicates that there is a zero energy region forming a double-wedge shape in 2D Fourier domain...
2017: International Journal of Biomedical Imaging
https://www.readbyqxmd.com/read/28807525/experimental-and-computational-analysis-of-micromotions-of-an-uncemented-femoral-knee-implant-using-elastic-and-plastic-bone-material-models
#18
Sanaz Berahmani, Dennis Janssen, Nico Verdonschot
It is essential to calculate micromotions at the bone-implant interface of an uncemented femoral total knee replacement (TKR) using a reliable computational model. In the current study, experimental measurements of micromotions were compared with predicted micromotions by Finite Element Analysis (FEA) using two bone material models: linear elastic and post-yield material behavior, while an actual range of interference fit was simulated. The primary aim was to investigate whether a plasticity model is essential in order to calculate realistic micromotions...
July 29, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28807095/simultaneous-detection-of-13-key-bacterial-respiratory-pathogens-by-combination-of-multiplex-pcr-and-capillary-electrophoresis
#19
Lu Xi Jiang, Hong Yu Ren, Hai Jian Zhou, Si Hong Zhao, Bo Yan Hou, Jian Ping Yan, Tian Qin, Yu Chen
OBJECTIVE: Lower respiratory tract infections continue to pose a significant threat to human health. It is important to accurately and rapidly detect respiratory bacteria. To compensate for the limits of current respiratory bacteria detection methods, we developed a combination of multiplex polymerase chain reaction (PCR) and capillary electrophoresis (MPCE) assay to detect thirteen bacterial pathogens responsible for lower respiratory tract infections, including Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, Pseudomonas aeruginosa, Klebsiella pneumoniae, Escherichia coli, Staphylococcus aureus, Mycoplasma pneumoniae, Legionella spp...
August 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/28806954/-usability-of-data-integration-and-visualization-software-for-multidisciplinary-pediatric-intensive-care-a-human-factors-approach-to-assessing-technology
#20
Ying Ling Lin, Anne-Marie Guerguerian, Jessica Tomasi, Peter Laussen, Patricia Trbovich
BACKGROUND: Intensive care clinicians use several sources of data in order to inform decision-making. We set out to evaluate a new interactive data integration platform called T3™ made available for pediatric intensive care. Three primary functions are supported: tracking of physiologic signals, displaying trajectory, and triggering decisions, by highlighting data or estimating risk of patient instability. We designed a human factors study to identify interface usability issues, to measure ease of use, and to describe interface features that may enable or hinder clinical tasks...
August 14, 2017: BMC Medical Informatics and Decision Making
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