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Human patient simulators

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https://www.readbyqxmd.com/read/27913322/automatic-detection-and-classification-of-high-frequency-oscillations-in-depth-eeg-signals
#1
Nisrine Jrad, Amar Kachenoura, Isabelle Merlet, Fabrice Bartolomei, Anca Nica, Arnaud Biraben, Fabrice Wendling
GOAL: Interictal High Frequency Oscillations (HFOs [30-600 Hz]) have proven to be relevant biomarkers in epilepsy. In this paper, four categories of HFOs are considered: Gamma ([30- 80 Hz]), High-Gamma ([80-120 Hz]), Ripples ([120-250 Hz]) and Fast-Ripples ([250-600 Hz]). A universal detector of the four types of HFOs is proposed. It has the advantages of i) classifying HFOs, and thus being robust to inter- and intra-subject variability; ii) rejecting artefacts, thus being specific. METHODS: Gabor atoms are tuned to cover the physiological bands...
November 29, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27911370/integrated-compensatory-responses-in-a-human-model-of-hemorrhage
#2
Victor A Convertino, Carmen Hinojosa-Laborde, Gary W Muniz, Robert Carter
Hemorrhage is the leading cause of trauma-related deaths, partly because early diagnosis of the severity of blood loss is difficult. Assessment of hemorrhaging patients is difficult because current clinical tools provide measures of vital signs that remain stable during the early stages of bleeding due to compensatory mechanisms. Consequently, there is a need to understand and measure the total integration of mechanisms that compensate for reduced circulating blood volume and how they change during ongoing progressive hemorrhage...
November 20, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910827/an-improved-asymmetric-gradient-coil-design-for-high-resolution-mri-head-imaging
#3
Fangfang Tang, Feng Liu, Fabio Freschi, Yu Li, Maurizio Repetto, Luca Giaccone, Yaohui Wang, Stuart Crozier
For head magnetic resonance imaging, local gradient coils are often used to achieve high solution images. To accommodate the human head and shoulder, the head gradient coils are usually designed in an asymmetric configuration, allowing the region-of-uniformity (ROU) close to the coil's patient end. However, the asymmetric configuration leads to technical difficulties in maintaining a high gradient performance for the insertable head coil with very limited space. In this work, we present a practical design configuration of an asymmetric insertable gradient head coil offering an improved performance...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27909833/verification-of-a-virtual-fields-method-to-extract-the-mechanical-properties-of-human-optic-nerve-head-tissues-in-vivo
#4
Liang Zhang, Sri Gowtham Thakku, Meghna R Beotra, Mani Baskaran, Tin Aung, James C H Goh, Nicholas G Strouthidis, Michael J A Girard
We aimed to verify a custom virtual fields method (VFM) to estimate the patient-specific biomechanical properties of human optic nerve head (ONH) tissues, given their full-field deformations induced by intraocular pressure (IOP). To verify the accuracy of VFM, we first generated 'artificial' ONH displacements from predetermined (known) ONH tissue biomechanical properties using finite element analysis. Using such deformations, if we are able to match back the known biomechanical properties, it would indicate that our VFM technique is accurate...
December 1, 2016: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/27903941/prep-t1-preteen-re-education-with-parents-type-1-diabetes-feasibility-intervention-results
#5
Susan Sullivan-Bolyai, Sybil Crawford, Kim Johnson, Neesha Ramchandani, Diane Quinn, Bianca D'Alesandro, Kailyn Stern, Terry Lipman, Gail Melkus, Randi Streisand
There has been a 2% to 3% increase in Type 1 diabetes (T1D) in children below 11 years old. Preteens (9-12 years old) with T1D are often overlooked regarding future diabetes self-management (DSM) expectations because parents are still in the "driver's seat." The study purpose was to explore feasibility/ability to recruit and conduct a two-arm trial on reeducation, collaboration, and social support. One component of DSM was reviewed (hypoglycemia) with preteens (n = 22) and parents (n = 22). The experimental preteens discussed hypoglycemia management with a teen mentor and nurse educator using a human patient simulator for practice, and working collaboratively with parents...
November 2016: Journal of Family Nursing
https://www.readbyqxmd.com/read/27897397/development-and-validation-of-a-septoplasty-training-model-using-3-dimensional-printing-technology
#6
Mahmoud A AlReefi, Lily H P Nguyen, Luc G Mongeau, Bassam Ul Haq, Siddharth Boyanapalli, Nauman Hafeez, Francois Cegarra-Escolano, Marc A Tewfik
BACKGROUND: Providing alternative training modalities may improve trainees' ability to perform septoplasty. Three-dimensional printing has been shown to be a powerful tool in surgical training. The objectives of this study were to explain the development of our 3-dimensional (3D) printed septoplasty training model, to assess its face and content validity, and to present evidence supporting its ability to distinguish between levels of surgical proficiency. METHODS: Imaging data of a patient with a nasal septal deviation was selected for printing...
November 29, 2016: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/27895209/holistic-nursing-simulation-a-concept-analysis
#7
Bonni S Cohen, Rebecca Boni
Simulation as a technology and holistic nursing care as a philosophy are two components within nursing programs that have merged during the process of knowledge and skill acquisition in the care of the patients as whole beings. Simulation provides opportunities to apply knowledge and skill through the use of simulators, standardized patients, and virtual settings. Concerns with simulation have been raised regarding the integration of the nursing process and recognizing the totality of the human being. Though simulation is useful as a technology, the nursing profession places importance on patient care, drawing on knowledge, theories, and expertise to administer patient care...
November 28, 2016: Journal of Holistic Nursing: Official Journal of the American Holistic Nurses' Association
https://www.readbyqxmd.com/read/27893451/rotating-and-translating-anthropomorphic-head-voxel-models-to-establish-an-horizontal-frankfort-plane-for-dental-cbct-monte-carlo-simulations-a-dose-comparison-study
#8
A Stratis, G Zhang, R Jacobs, R Bogaerts, H Bosmans
In order to carry out Monte Carlo (MC) dosimetry studies, voxel phantoms, modeling human anatomy, and organ-based segmentation of CT image data sets are applied to simulation frameworks. The resulting voxel phantoms preserve patient CT acquisition geometry; in the case of head voxel models built upon head CT images, the head support with which CT scanners are equipped introduces an inclination to the head, and hence to the head voxel model. In dental cone beam CT (CBCT) imaging, patients are always positioned in such a way that the Frankfort line is horizontal, implying that there is no head inclination...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27891088/an-emg-interface-for-the-control-of-motion-and-compliance-of-a-supernumerary-robotic-finger
#9
Irfan Hussain, Giovanni Spagnoletti, Gionata Salvietti, Domenico Prattichizzo
In this paper, we propose a novel electromyographic (EMG) control interface to control motion and joints compliance of a supernumerary robotic finger. The supernumerary robotic fingers are a recently introduced class of wearable robotics that provides users additional robotic limbs in order to compensate or augment the existing abilities of natural limbs without substituting them. Since supernumerary robotic fingers are supposed to closely interact and perform actions in synergy with the human limbs, the control principles of extra finger should have similar behavior as human's ones including the ability of regulating the compliance...
2016: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/27890533/full-thickness-tears-of-the-supraspinatus-tendon-a-three-dimensional-finite-element-analysis
#10
C Quental, J Folgado, J Monteiro, M Sarmento
Knowledge regarding the likelihood of propagation of supraspinatus tears is important to allow an early identification of patients for whom a conservative treatment is more likely to fail, and consequently, to improve their clinical outcome. The aim of this study was to investigate the potential for propagation of posterior, central, and anterior full-thickness tears of different sizes using the finite element method. A three-dimensional finite element model of the supraspinatus tendon was generated from the Visible Human Project data...
November 16, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27882202/computed-tomography-colonography-phantom-construction-validation-and-literature-review
#11
Lukas Lambert, Alena Lambertova, Jan Danes, Gabriela Grusova
BACKGROUND: Several dedicated computed tomography (CT) colonography phantoms have been described previously. OBJECTIVES: To compare their pros and cons and describe the construction of a dedicated phantom that can be easily manufactured. MATERIALS AND METHODS: We found 15 different phantom designs by literature search and compared their advantages and disadvantages based on their description and images. We tested various materials for density and mechanical properties and constructed a phantom from polypropylene pipes (30 mm and 50 mm in diameter, 52 cm in length)...
October 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
https://www.readbyqxmd.com/read/27879478/occurrence-of-hiv-eradication-for-preexposure-prophylaxis-treatment-with-a-deterministic-hiv-model
#12
Hyeygjeon Chang, Claude Moog, Alessandro Astolfi
The authors examine the human immunodeficiency virus (HIV) eradication in this study using a mathematical model and analyse the occurrence of virus eradication during the early stage of infection. To this end they use a deterministic HIV-infection model, modify it to describe the pharmacological dynamics of antiretroviral HIV drugs, and consider the clinical experimental results of preexposure prophylaxis HIV treatment. They also use numerical simulation to model the experimental scenario, thereby supporting the clinical results with a model-based explanation...
December 2016: IET Systems Biology
https://www.readbyqxmd.com/read/27878399/altered-architecture-and-cell-populations-affect-bone-marrow-mechanobiology-in-the-osteoporotic-human-femur
#13
Thomas A Metzger, Ted J Vaughan, Laoise M McNamara, Glen L Niebur
Age-related increases in trabecular bone porosity, as seen in osteoporosis, not only affect the strength and stiffness, but also potentially the mechanobiological response of bone. The mechanical interaction between trabecular bone and bone marrow is one source of mechanobiological signaling, as many cell populations in marrow are mechanosensitive. However, measuring the mechanics of this interaction is difficult, due to the length scales and geometric complexity of trabecular bone. In this study, a multi-scale computational scheme incorporating high-resolution, tissue-level, fluid-structure interaction simulations with discrete cell-level models was applied to characterize the potential effects of trabecular porosity and marrow composition on marrow mechanobiology in human femoral bone...
November 22, 2016: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/27875722/progenitor-cells-from-atria-ventricle-and-peripheral-blood-of-the-same-patients-exhibit-functional-differences-associated-with-cardiac-repair
#14
Parul Dixit, Hayden Donnelly, Midori Edamatsu, Ivor Galvin, Richard Bunton, Rajesh Katare
AIM: Deciding the best cell type for cardiac regeneration remains a big challenge. No studies have directly compared the functional efficacy of cardiac progenitor cells (CPCs) with extra-cardiac stem cells isolated from the same patient. METHODS AND RESULTS: We compared the functional characteristics of endothelial progenitor cells (EPCs), right atrial (RAA) CPCs and left ventricular (LV) CPCs isolated from the same patients (n=14). Within the same heart, RAA and LV CPCs exhibited marked differences in surface marker expression, with RAA CPCs exhibiting better expansion potential and migration properties...
November 19, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27871710/microbiological-assessment-of-aerosol-generated-during-debond-of-fixed-orthodontic-appliances
#15
Michael Dawson, Valeria Soro, David Dymock, Robert Price, Helen Griffiths, Tom Dudding, Jonathan R Sandy, Anthony J Ireland
INTRODUCTION: The aims of this study were to describe bacterial load and diversity of the aerosol created during enamel cleanup after the removal of fixed orthodontic appliances and to assess the effect of a preprocedural mouth rinse. METHODS: The study involved the sampling of ambient air adjacent to the patient's mouth during adhesive removal using a slow-speed handpiece and a spiral fluted tungsten carbide bur without water irrigation. Sampling was carried out during enamel cleanup with or without a preprocedural mouth rinse of either sterile water or chlorhexidine...
November 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/27863743/in-vitro-and-in-silico-approaches-to-quantify-the-effects-of-the-mitraclip-%C3%A2-system-on-mitral-valve-function
#16
Francesco Sturla, Riccardo Vismara, Michal Jaworek, Emiliano Votta, Paolo Romitelli, Omar A Pappalardo, Federico Lucherini, Carlo Antona, Gianfranco B Fiore, Alberto Redaelli
Mitraclip(®) implantation is widely used as a valid alternative to conventional open-chest surgery in high-risk patients with severe mitral valve (MV) regurgitation. Although effective in reducing mitral regurgitation (MR) in the majority of cases, the clip implantation produces a double-orifice area that can result in altered MV biomechanics, particularly in term of hemodynamics and mechanical stress distribution on the leaflets. In this scenario, we combined the consistency of in vitro experimental platforms with the versatility of numerical simulations to investigate clip impact on MV functioning...
November 10, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27863186/model-based-characterization-of-the-pharmacokinetics-of-pembrolizumab-a-humanized-anti-pd-1-monoclonal-antibody-in-advanced-solid-tumors
#17
M Ahamadi, T Freshwater, M Prohn, C H Li, D P de Alwis, R de Greef, J Elassaiss-Schaap, A Kondic, J A Stone
Pembrolizumab, a potent antibody against programmed death 1 (PD-1) receptor, has shown robust antitumor activity and manageable safety in patients with advanced solid tumors. Its pharmacokinetic (PK) properties were analyzed with population PK modeling using pooled data from the KEYNOTE-001, -002, and -006 studies of patients with advanced melanoma, non-small cell lung cancer (NSCLC), and other solid tumor types. Pembrolizumab clearance was low and the volume of distribution small, as is typical for therapeutic antibodies...
November 14, 2016: CPT: Pharmacometrics & Systems Pharmacology
https://www.readbyqxmd.com/read/27863120/numerical-simulation-of-volume-controlled-mechanical-ventilated-respiratory-system-with-two-different-lungs
#18
Yan Shi, Bolun Zhang, Maolin Cai, Xiaohua Douglas Zhang
Mechanical ventilation is a key therapy for patients who can't breathe adequately by themselves, and dynamics of mechanical ventilation system is of great significance for life support of patients. Recently, models of mechanical ventilated respiratory system with one lung are used to simulate respiratory system of patients. However, human has two lungs. When the respiratory characteristics of two lungs are different, single-lung model cannot reflect real respiratory system. In this paper, to illustrate dynamic characteristics of mechanical ventilated respiratory system with two different lungs, we propose a mathematical model of mechanical ventilated respiratory system with two different lungs and conduct experiments to verify the model...
November 9, 2016: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/27861991/impact-of-target-mediated-elimination-on-the-dose-and-regimen-of-evolocumab-a-human-monoclonal-antibody-against-proprotein-convertase-subtilisin-kexin-type-9-pcsk9
#19
John P Gibbs, Sameer Doshi, Mita Kuchimanchi, Anita Grover, Maurice G Emery, Michael G Dodds, Megan A Gibbs, Ransi Somaratne, Scott M Wasserman, Dirk Blom
Understanding the pharmacokinetic (PK) and pharmacodynamic (PD) relationship of a therapeutic monoclonal antibody against proprotein convertase subtilisin/kexin type 9 (PCSK9) exhibiting target-mediated drug disposition (TMDD) is critical for selecting optimal dosing regimens. We describe the PK/PD relationship of evolocumab using a mathematical model that captures evolocumab binding and removal of unbound PCSK9 as well as reduction in circulating low-density lipoprotein cholesterol (LDL-C). Data were pooled from 2 clinical studies: a single-dose escalation study in healthy subjects (7-420 mg SC; n = 44) and a multiple-dose escalation study in statin-treated hypercholesterolemic patients (14 mg weekly to 420 mg monthly [QM] SC; n = 57)...
November 15, 2016: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/27857190/simulated-ischemia-reperfusion-induced-p65-beclin-1-dependent-autophagic-cell-death-in-human-umbilical-vein-endothelial-cells
#20
Min Zeng, Xin Wei, Zhiyong Wu, Wei Li, Yin Zheng, Bing Li, Xuqing Meng, Xiuhong Fu, Yi Fei
Myocardial ischemia/reperfusion (I/R) injury detrimentally alters the prognosis of patients undergoing revascularization after acute myocardial infarction. Our previous study demonstrated that NF-κB-induced autophagy plays a detrimental role in cardiac I/R injury using a rabbit myocardial I/R model. In this study, we sought to explore the specific mechanism of this autophagy-mediated cell damage in an in vitro simulated ischemia/reperfusion (sI/R) model using human umbilical vein endothelial cells. Our current study demonstrates that simulated I/R induces autophagy in a p65-Beclin 1-dependent manner, which can be suppressed with the inhibition of NF-κB...
November 18, 2016: Scientific Reports
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