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Spinal cord computational model

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https://www.readbyqxmd.com/read/29784823/continuous-intrathecal-orexin-delivery-inhibits-cataplexy-in-a-murine-model-of-narcolepsy
#1
Mahesh K Kaushik, Kosuke Aritake, Aya Imanishi, Takashi Kanbayashi, Tadashi Ichikawa, Tetsuo Shimizu, Yoshihiro Urade, Masashi Yanagisawa
Narcolepsy-cataplexy is a chronic neurological disorder caused by loss of orexin (hypocretin)-producing neurons, associated with excessive daytime sleepiness, sleep attacks, cataplexy, sleep paralysis, hypnagogic hallucinations, and fragmentation of nighttime sleep. Currently, human narcolepsy is treated by providing symptomatic therapies, which can be associated with an array of side effects. Although peripherally administered orexin does not efficiently penetrate the blood-brain barrier, centrally delivered orexin can effectively alleviate narcoleptic symptoms in animal models...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29759043/electrochemotherapy-of-spinal-metastases-using-transpedicular-approach-a-numerical-feasibility-study
#2
Helena Cindrič, Bor Kos, Giuseppe Tedesco, Matteo Cadossi, Alessandro Gasbarrini, Damijan Miklavčič
Vertebral column is the most frequent site for bone metastases. It has been demonstrated in previous studies that bone metastases can be efficiently treated by electrochemotherapy. We developed a novel approach to treat spinal metastases, that is, transpedicular approach that combines electrochemotherapy with already established technologies for insertion of fixation screws in spinal surgery. In the transpedicular approach, needle electrodes are inserted into the vertebral body through pedicles and placed around the tumor...
January 1, 2018: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29729417/compressive-mechanical-characterization-of-non-human-primate-spinal-cord-white-matter
#3
Shervin Jannesar, Mark Allen, Sarah Mills, Anne Gibbons, Jacqueline C Bresnahan, Ernesto A Salegio, Carolyn J Sparrey
The goal of developing computational models of spinal cord injury (SCI) is to better understand the human injury condition. However, finite element models of human SCI have used rodent spinal cord tissue properties due to a lack of experimental data. Central nervous system tissues in non human primates (NHP) closely resemble that of humans and therefore, it is expected that material constitutive models obtained from NHPs will increase the fidelity and the accuracy of human SCI models. Human SCI most often results from compressive loading and spinal cord white matter properties affect FE predicted patterns of injury; therefore, the objectives of this study were to characterize the unconfined compressive response of NHP spinal cord white matter and present an experimentally derived, finite element tractable constitutive model for the tissue...
May 2, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29706759/prediction-model-for-the-presence-of-complications-at-admission-to-rehabilitation-after-traumatic-spinal-cord-injury
#4
Giorgio Scivoletto, Monica Torre, Marco Iosa, Maria Rosaria Porto, Marco Molinari
Background: Complications frequently occur in patients with spinal cord injury (SCI) during acute care or rehabilitation and have an impact on rehabilitation outcomes. Purpose: The aim of this study was to determine the occurrence and risk factors for complications in recently injured SCI patients. Methods : Two hundred fifty patients with traumatic injuries with and without complications were counted for the following dichotomous parameters: gender (male/female), associated lesions (presence/absence), surgery (yes/no), American Spinal Injury Association Impairment Scale (AIS) grade (A/other categories), lesion level (lumbar/other levels), and lesion-to-admission time (less than/longer than 1 month)...
2018: Topics in Spinal Cord Injury Rehabilitation
https://www.readbyqxmd.com/read/29703705/integration-of-radiobiological-modeling-and-indices-in-comparative-plan-evaluation-a-study-comparing-vmat-and-3d-crt-in-patients-with-nsclc
#5
Soumyajit Roy, Iulian Badragan, Sheikh Nisar Ahmed, Michael Sia, Jorawur Singh, Gaurav Bahl
PURPOSE: The purpose of this article was to generate an algorithm to calculate radiobiological endpoints and composite indices and use them to compare volumetric modulated arc therapy (VMAT) and 3-dimensional conformal radiation therapy (3D-CRT) techniques in patients with locally advanced non-small cell lung cancer. METHODS AND MATERIALS: The study included 25 patients with locally advanced non-small cell lung cancer treated with 3D-CRT at our center between January 1, 2010, and December 31, 2014...
March 1, 2018: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29649650/assessment-of-myelopathy-in-cervical-ossification-of-the-posterior-longitudinal-ligament-by-mri-assisted-3d-measurement
#6
Zhiwei Wang, Yanqing Sun, Yifan Tang, Bo Yuan, Shengyuan Zhou, Xiongsheng Chen, Lianshun Jia
OBJECTIVE: Ossification of the posterior longitudinal ligament (OPLL) is a three-dimensional (3D) disease that causes cervical myelopathy. The conventional two-dimensional(2D) measurement of OPLL has limitations in estimating cord-compression and myelopathy. In this study, we attempted to use three-dimensional computed tomography(3D CT) and magnetic resonance imaging(MRI) to measure the 3D occupying ratio of OPLL and investigate its significance in assessment of spinal cord myelopathy...
April 9, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29618353/efficacy-of-virtual-block-objects-in-reducing-the-lung-dose-in-helical-tomotherapy-planning-for-cervical-oesophageal-cancer-a-planning-study
#7
Makoto Ito, Hidetoshi Shimizu, Takahiro Aoyama, Hiroyuki Tachibana, Natsuo Tomita, Chiyoko Makita, Yutaro Koide, Daiki Kato, Tsuneo Ishiguchi, Takeshi Kodaira
BACKGROUND: Intensity-modulated radiotherapy is useful for cervical oesophageal carcinoma (CEC); however, increasing low-dose exposure to the lung may lead to radiation pneumonitis. Nevertheless, an irradiation technique that avoids the lungs has never been examined due to the high difficulty of dose optimization. In this study, we examined the efficacy of helical tomotherapy that can restrict beamlets passing virtual blocks during dose optimization computing (block plan) in reducing the lung dose...
April 4, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29592888/dorsal-and-ventral-horn-atrophy-is-associated-with-clinical-outcome-after-spinal-cord-injury
#8
Eveline Huber, Gergely David, Alan J Thompson, Nikolaus Weiskopf, Siawoosh Mohammadi, Patrick Freund
OBJECTIVE: To investigate whether gray matter pathology above the level of injury, alongside white matter changes, also contributes to sensorimotor impairments after spinal cord injury. METHODS: A 3T MRI protocol was acquired in 17 tetraplegic patients and 21 controls. A sagittal T2-weighted sequence was used to characterize lesion severity. At the C2-3 level, a high-resolution T2*-weighted sequence was used to assess cross-sectional areas of gray and white matter, including their subcompartments; a diffusion-weighted sequence was used to compute voxel-based diffusion indices...
March 28, 2018: Neurology
https://www.readbyqxmd.com/read/29556300/a-dosimetric-phantom-study-of-thoracic-radiotherapy-based-on-three-dimensional-modeling-of-mediastinal-lymph-nodes
#9
Ji-Bin Zhang, Li-Rong Zhao, Tian-Xiang Cui, Xie-Wan Chen, Qiao Yang, Yi-Bing Zhou, Zheng-Tang Chen, Shao-Xiang Zhang, Jian-Guo Sun
The aim of the present study was to investigate the optimal strategy and dosimetric measurement of thoracic radiotherapy based on three-dimensional (3D) modeling of mediastinal lymph nodes (MLNs). A 3D model of MLNs was constructed from a Chinese Visible Human female dataset. Image registration and fusion between reconstructed MLNs and original chest computed tomography (CT) images was conducted in the Eclipse™ treatment planning system (TPS). There were three plans, including 3D conformal radiotherapy (3D-CRT), intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc therapy (VMAT), which were designed based on 10 cases of simulated lung lesions (SLLs) and MLNs...
April 2018: Oncology Letters
https://www.readbyqxmd.com/read/29544145/bamos-a-recording-application-for-basso-mouse-scale-of-locomotion-in-experimental-models-of-spinal-cord-injury
#10
Alberto Gómez, Manuel Nieto-Díaz, Ángela Del Águila, Enrique Arias
Transparency in science is increasingly a hot topic. Scientists are required to show not only results but also evidence of how they have achieved these results. In experimental studies of spinal cord injury, there are a number of standardized tests, such as the Basso-Beattie-Bresnahan locomotor rating scale for rats and Basso Mouse Scale for mice, which researchers use to study the pathophysiology of spinal cord injury and to evaluate the effects of experimental therapies. Although the standardized data from the Basso-Beattie-Bresnahan locomotor rating scale and the Basso Mouse Scale are particularly suited for storage and sharing in databases, systems of data acquisition and repositories are still lacking...
May 1, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29541757/cost-effectiveness-of-magnetic-resonance-imaging-in-cervical-clearance-of-obtunded-blunt-trauma-after-a-normal-computed-tomographic-finding
#11
Xiao Wu, Ajay Malhotra, Bertie Geng, Vivek B Kalra, Khalid Abbed, Howard P Forman, Pina Sanelli
Importance: Magnetic resonance imaging (MRI) continues to be performed for cervical clearance of obtunded blunt trauma, despite poor evidence regarding its utility after a normal computed tomographic (CT) finding. Objective: To evaluate the utility and cost-effectiveness of MRI vs no follow-up after a normal cervical CT finding in patients with obtunded blunt trauma. Design, Setting and Participants: This cost-effectiveness analysis evaluated an average patient aged 40 years with blunt trauma from an institutional practice...
March 14, 2018: JAMA Surgery
https://www.readbyqxmd.com/read/29523203/computer-simulation-of-syringomyelia-in-dogs
#12
Srdjan Cirovic, Robert Lloyd, Jelena Jovanovik, Holger A Volk, Clare Rusbridge
BACKGROUND: Syringomyelia is a pathological condition in which fluid-filled cavities (syringes) form and expand in the spinal cord. Syringomyelia is often linked with obstruction of the craniocervical junction and a Chiari malformation, which is similar in both humans and animals. Some brachycephalic toy breed dogs such as Cavalier King Charles Spaniels (CKCS) are particularly predisposed. The exact mechanism of the formation of syringomyelia is undetermined and consequently with the lack of clinical explanation, engineers and mathematicians have resorted to computer models to identify possible physical mechanisms that can lead to syringes...
March 9, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29491478/axondeepseg-automatic-axon-and-myelin-segmentation-from-microscopy-data-using-convolutional-neural-networks
#13
Aldo Zaimi, Maxime Wabartha, Victor Herman, Pierre-Louis Antonsanti, Christian S Perone, Julien Cohen-Adad
Segmentation of axon and myelin from microscopy images of the nervous system provides useful quantitative information about the tissue microstructure, such as axon density and myelin thickness. This could be used for instance to document cell morphometry across species, or to validate novel non-invasive quantitative magnetic resonance imaging techniques. Most currently-available segmentation algorithms are based on standard image processing and usually require multiple processing steps and/or parameter tuning by the user to adapt to different modalities...
February 28, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29430662/on-the-feasibility-of-automatically-selecting-similar-patients-in-highly-individualized-radiotherapy-dose-reconstruction-for-historic-data-of-pediatric-cancer-survivors
#14
Marco Virgolin, Irma W E M van Dijk, Jan Wiersma, Cécile M Ronckers, Cees Witteveen, Arjan Bel, Tanja Alderliesten, Peter A N Bosman
PURPOSE: The aim of this study is to establish the first step toward a novel and highly individualized three-dimensional (3D) dose distribution reconstruction method, based on CT scans and organ delineations of recently treated patients. Specifically, the feasibility of automatically selecting the CT scan of a recently treated childhood cancer patient who is similar to a given historically treated child who suffered from Wilms' tumor is assessed. METHODS: A cohort of 37 recently treated children between 2- and 6-yr old are considered...
April 2018: Medical Physics
https://www.readbyqxmd.com/read/29411711/microstructure-and-in-vivo-characterization-of-multi-channel-nerve-guidance-scaffolds
#15
K M Pawelec, J Koffler, D Shahriari, A Galvan, M H Tuszynski, J Sakamoto
In a previous study, we demonstrated a novel manufacturing approach to fabricate multi-channel scaffolds (MCS) for use in spinal cord injuries (SCI). In the present study, we extended similar materials processing technology to fabricate significantly longer (5X) porous poly caprolactone (PCL) MCS and evaluated their efficacy in 1 cm sciatic peripheral nerve injury (PNI) model. Due to the increase in MCS dimensions and the challenges that may arise in a longer nerve gap model, microstructural characterization involved MCS wall permeability to assess nutrient flow, topography, and microstructural uniformity to evaluate the potential for homogeneous linear axon guidance...
April 25, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29399061/neuroprotective-effect-of-local-hypothermia-in-a-computer-controlled-compression-model-in-minipig-correlation-of-tissue-sparing-along-the-rostro-caudal-axis-with-neurological-outcome
#16
Stefania Gedrova, Jan Galik, Martin Marsala, Monika Zavodska, Jaroslav Pavel, Igor Sulla, Miroslav Gajdos, Imrich Lukac, Jozef Kafka, Valent Ledecky, Igor Sulla, Martina Karasova, Peter Reichel, Alexandra Trbolova, Igor Capik, Viktoria Lukacova, Katarina Bimbova, Maria Bacova, Andrea Stropkovska, Nadezda Lukacova
This study investigated the neuroprotective efficacy of local hypothermia in a minipig model of spinal cord injury (SCI) induced by a computer-controlled impactor device. The tissue integrity observed at the injury epicenter, and up to 3 cm cranially and caudally from the lesion site correlated with motor function. A computer-controlled device produced contusion lesions at L3 level with two different degrees of tissue sparing, depending upon pre-set impact parameters (8N- and 15N-force impact). Hypothermia with cold (4°C) saline or Dulbecco's modified Eagle's medium (DMEM)/F12 culture medium was applied 30 min after SCI (for 5 h) via a perfusion chamber (flow 2 ml/min)...
January 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29397209/update-of-the-systematic-review-of-palliative-radiation-therapy-fractionation-for-bone-metastases
#17
Shayna E Rich, Ronald Chow, Srinivas Raman, K Liang Zeng, Stephen Lutz, Henry Lam, Maurício F Silva, Edward Chow
PURPOSE: Radiation therapy is an effective modality for pain management of symptomatic bone metastases. We update the previous meta-analyses of randomized trials comparing single fraction to multiple fractions of radiation therapy in patients with uncomplicated bone metastases. METHODS: A literature search was conducted in Ovid Medline, Embase, and Cochrane Central Register. Ten new randomized trials were identified since 2010, five with adequate and appropriate data for inclusion, resulting in a total of 29 trials that were analyzed...
March 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29386408/transcutaneous-spinal-direct-current-stimulation-of-the-lumbar-and-sacral-spinal-cord-a-modelling-study
#18
Sofia R Fernandes, Ricardo Salvador, Cornelia Wenger, M de Carvalho, Pedro C Miranda
OBJECTIVE: Our aim was to perform a computational study of the electric field (E-field) generated by transcutaneous spinal direct current stimulation (tsDCS) applied over the thoracic, lumbar and sacral spinal cord, in order to assess possible neuromodulatory effects on spinal cord circuitry related with lower limb functions. APPROACH: A realistic volume conductor model of the human body consisting of 14 tissues was obtained from available databases. Rubber pad electrodes with a metallic connector and a conductive gel layer were modelled...
February 9, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29381748/common-neural-structures-activated-by-epidural-and-transcutaneous-lumbar-spinal-cord-stimulation-elicitation-of-posterior-root-muscle-reflexes
#19
Ursula S Hofstoetter, Brigitta Freundl, Heinrich Binder, Karen Minassian
Epidural electrical stimulation of the lumbar spinal cord is currently regaining momentum as a neuromodulation intervention in spinal cord injury (SCI) to modify dysregulated sensorimotor functions and augment residual motor capacity. There is ample evidence that it engages spinal circuits through the electrical stimulation of large-to-medium diameter afferent fibers within lumbar and upper sacral posterior roots. Recent pilot studies suggested that the surface electrode-based method of transcutaneous spinal cord stimulation (SCS) may produce similar neuromodulatory effects as caused by epidural SCS...
2018: PloS One
https://www.readbyqxmd.com/read/29378445/real-time-closed-loop-functional-electrical-stimulation-control-of-muscle-activation-with-evoked-electromyography-feedback-for-spinal-cord-injured-patients
#20
Zhan Li, David Guiraud, David Andreu, Anthony Gelis, Charles Fattal, Mitsuhiro Hayashibe
Functional electrical stimulation (FES) is a neuroprosthetic technique to help restore motor function of spinal cord-injured (SCI) patients. Through delivery of electrical pulses to muscles of motor-impaired subjects, FES is able to artificially induce their muscle contractions. Evoked electromyography (eEMG) is used to record such FES-induced electrical muscle activity and presents a form of [Formula: see text]-wave. In order to monitor electrical muscle activity under stimulation and ensure safe stimulation configurations, closed-loop FES control with eEMG feedback is needed to be developed for SCI patients who lose their voluntary muscle contraction ability...
December 25, 2017: International Journal of Neural Systems
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