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Validation cost effectiveness simulation

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https://www.readbyqxmd.com/read/28100215/a-discrete-event-simulation-model-to-evaluate-the-use-of-community-services-in-the-treatment-of-patients-with-parkinson-s-disease-in-the-united-kingdom
#1
Reda Lebcir, Eren Demir, Raheelah Ahmad, Christos Vasilakis, David Southern
BACKGROUND: The number of people affected by Parkinson's disease (PD) is increasing in the United Kingdom driven by population ageing. The treatment of the disease is complex, resource intensive and currently there is no known cure to PD. The National Health Service (NHS), the public organisation delivering healthcare in the UK, is under financial pressures. There is a need to find innovative ways to improve the operational and financial performance of treating PD patients. The use of community services is a new and promising way of providing treatment and care to PD patients at reduced cost than hospital care...
January 18, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28075345/software-defined-doppler-radar-as-a-contactless-multipurpose-microwave-sensor-for-vibrations-monitoring
#2
Antonio Raffo, Sandra Costanzo, Giuseppe Di Massa
A vibration sensor based on the use of a Software-Defined Radio (SDR) platform is adopted in this work to provide a contactless and multipurpose solution for low-cost real-time vibrations monitoring. In order to test the vibration detection ability of the proposed non-contact method, a 1 GHz Doppler radar sensor is simulated and successfully assessed on targets at various distances, with various oscillation frequencies and amplitudes. Furthermore, an SDR Doppler platform is practically realized, and preliminary experimental validations on a device able to produce a harmonic motion are illustrated to prove the effectiveness of the proposed approach...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28070685/porcine-spine-finite-element-model-a-complementary-tool-to-experimental-scoliosis-fusionless-instrumentation
#3
Bahe Hachem, Carl-Eric Aubin, Stefan Parent
PURPOSE: Developing fusionless devices to treat pediatric scoliosis necessitates lengthy and expensive animal trials. The objective was to develop and validate a porcine spine numerical model as an alternative platform to assess fusionless devices. METHODS: A parametric finite element model (FEM) of an osseoligamentous porcine spine and rib cage, including the epiphyseal growth plates, was developed. A follower-type load replicated physiological and gravitational loads...
January 9, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28048653/tu-h-campus-jep1-01-characterization-of-a-parameterized-image-similarity-cost-function-for-automated-patient-and-site-specific-dir-accuracy-optimizations
#4
J Neylon, Y Min, K Hasse, D Low, A Santhanam
PURPOSE: Clinical deformable image registration (DIR) accuracy is difficult to quantify, making validation and verification manual and time consuming. It has also been seen that DIR accuracy can be improved by patient and site specific optimization. We previously investigated a cost function to parameterize image similarity metrics (ISMs) and provide a quantifiable comparison of DIR performance. In this abstract, we characterize and optimize the cost function response (CFR) and correlation to target registration error (TRE) in a dense registration parameter space...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047571/su-f-j-187-the-statistical-ntcp-and-tcp-models-in-the-proton-therapy
#5
S Jang, T Frometa, A Pyakuryal, T Sio, R Piseaux, S Acosta, K Ocana
PURPOSE: The statistical models (SM) are typically used as a subjective description of a population for which there is only limited sample data, and especially in cases where the relationship between variables is known. The normal tissue complications and tumor control are frequently stochastic effects in the Radiotherapy (RT). Based on probabilistic treatments, it recently has been formulated new NTCP and TCP models for the RT. Investigating the particular requirements for their clinical use in the proton therapy (PT) is the goal of this work...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28035842/clinical-and-cost-implications-of-beta-amyloid-detection-with-a%C3%AE-pet-imaging-in-early-alzheimer-s-disease-the-case-of-florbetapir
#6
John Hornberger, Jay Bae, Ian Watson, Joe Johnston, Michael Happich
OBJECTIVE: Amyloid-β (Aβ) positron emission tomography (PET) imaging helps estimate Aβ neuritic plaque density in patients with cognitive impairment who are under evaluation for Alzheimer's disease (AD). This study aims to evaluate the cost-effectiveness of the Aβ-PET scan as an adjunct to standard diagnostic assessment for diagnosis of AD in France, using florbetapir as an example. METHODS: A state-transition probability analysis was developed adopting the French Health Technology Assessment (HTA) perspective per guidance...
December 30, 2016: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/28025930/cost-effectiveness-of-treatment-sequences-of-chemotherapies-and-targeted-biologics-for-elderly-metastatic-colorectal-cancer-patients
#7
Rohan C Parikh, Xianglin L Du, Morgan O Robert, David R Lairson
BACKGROUND: Treatment patterns for metastatic colorectal cancer (mCRC) patients have changed considerably over the last decade with the introduction of new chemotherapies and targeted biologics. These treatments are often administered in various sequences with limited evidence regarding their cost-effectiveness. OBJECTIVE: To conduct a pharmacoeconomic evaluation of commonly administered treatment sequences among elderly mCRC patients. METHODS: A probabilistic discrete event simulation model assuming Weibull distribution was developed to evaluate the cost-effectiveness of the following common treatment sequences: (a) first-line oxaliplatin/irinotecan followed by second-line oxaliplatin/irinotecan + bevacizumab (OI-OIB); (b) first-line oxaliplatin/irinotecan + bevacizumab followed by second-line oxaliplatin/irinotecan + bevacizumab (OIB-OIB); (c) OI-OIB followed by a third-line targeted biologic (OI-OIB-TB); and (d) OIB-OIB followed by a third-line targeted biologic (OIB-OIB-TB)...
January 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/27981603/exploring-str-signal-in-the-single-and-multi-copy-number-regimes-deductions-from-an-in-silico-model-of-the-entire-dna-laboratory-process
#8
Ken R Duffy, Neil Gurram, Kelsey C Peters, Genevieve Wellner, Catherine M Grgicak
Short tandem repeat (STR) profiling from DNA samples has long been the bedrock of human identification. The laboratory process is composed of multiple procedures that include quantification, sample dilution, PCR, electrophoresis and fragment analysis. The end-product is an STR electropherogram comprised of signal from allele, artifacts and instrument noise. In order to optimize or alter laboratory protocols, a large number of validation samples must be created at significant expense. As a tool to support that process and to enable the exploration of complex scenarios without costly sample creation, a mechanistic stochastic model that incorporates each of the aforementioned processing features is described herein...
December 16, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27958728/mechanistic-models-of-chemical-exchange-induced-relaxation-in-protein-nmr
#9
Simon Olsson, Frank Noé
Long-lived conformational states and their interconversion rates critically determine protein function and regulation. When these states have distinct chemical shifts, the measurement of relaxation by NMR may provide us with useful information about their structure, kinetics, and thermodynamics at atomic resolution. However, as these experimental data are sensitive to many structural and dynamic effects, their interpretation with phenomenological models is challenging, even if only a few metastable states are involved...
December 27, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27956516/a-pulse-shaping-technique-to-investigate-the-behaviour-of-brittle-materials-subjected-to-plate-impact-tests
#10
Pascal Forquin, Jean-Luc Zinszner
Owing to their significant hardness and compressive strengths, ceramic materials are widely employed for use with protective systems subjected to high-velocity impact loadings. Therefore, their mechanical behaviour along with damage mechanisms need to be significantly investigated as a function of loading rates. However, the classical plate-impact testing procedures produce shock loadings in the brittle sample material which cause unrealistic levels of loading rates. Additionally, high-pulsed power techniques and/or functionally graded materials used as flyer plates to smooth the loading pulse remain costly, and are generally difficult to implement...
January 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27951668/assessing-the-accuracy-of-across-the-scale-methods-for-predicting-carbohydrate-conformational-energies-for-the-examples-of-glucose-and-%C3%AE-maltose
#11
Mateusz Marianski, Adriana Supady, Teresa Ingram, Markus Schneider, Carsten Baldauf
A big hurdle when entering the field of carbohydrate research stems from the complications in the analytical and computational treatment. In effect, this extremely important class of biomolecules remains underinvestigated when compared, for example, with the maturity of genomics and proteomics research. On the theory side, the commonly used empirical methods suffer from an insufficient amount of high-quality experimental data against which they can be thoroughly validated. In order to provide a pivotal point for an ascent of accurate carbohydrate simulations, we present here a structure/energy benchmark set of diverse glucose (in three isomeric forms) and α-maltose conformations at the coupled-cluster level as well as an assessment of commonly used energy functions...
December 13, 2016: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/27942106/enhanced-model-predictive-control-empc-strategy-for-automated-glucose-control
#12
Joon Bok Lee, Eyal Dassau, Ravi Gondhalekar, Dale E Seborg, Jordan E Pinsker, Francis J Doyle
Development of an effective artificial pancreas (AP) controller to deliver insulin autonomously to people with type 1 diabetes mellitus is a difficult task. In this paper, three enhancements to a clinically validated AP model predictive controller (MPC) are proposed that address major challenges facing automated blood glucose control, and are then evaluated by both in silico tests and clinical trials. First, the core model of insulin-blood glucose dynamics utilized in the MPC is expanded with a medically inspired personalization scheme to improve controller responses in the face of inter- and intra-individual variations in insulin sensitivity...
November 23, 2016: Industrial & Engineering Chemistry Research
https://www.readbyqxmd.com/read/27936136/improving-the-non-hydrostatic-numerical-dust-model-by-integrating-soil-moisture-and-greenness-vegetation-fraction-data-with-different-spatiotemporal-resolutions
#13
Manzhu Yu, Chaowei Yang
Dust storms are devastating natural disasters that cost billions of dollars and many human lives every year. Using the Non-Hydrostatic Mesoscale Dust Model (NMM-dust), this research studies how different spatiotemporal resolutions of two input parameters (soil moisture and greenness vegetation fraction) impact the sensitivity and accuracy of a dust model. Experiments are conducted by simulating dust concentration during July 1-7, 2014, for the target area covering part of Arizona and California (31, 37, -118, -112), with a resolution of ~ 3 km...
2016: PloS One
https://www.readbyqxmd.com/read/27909673/how-to-build-your-simple-and-cost-effective-arthroscopic-skills-simulator
#14
Georgios Arealis, James Holton, Joana Bento Rodrigues, Maria Sagkrioti, Martyn Snow, Mark Hamlet, Ofer Levy
Acquisition of arthroscopic skills is not always easy and can be time-consuming. Simulation in arthroscopy improves surgical skills and can bridge the gap between reduced surgical exposure and training time and the need to reach a required level of competency. We propose a method to create a simple and cost-effective arthroscopic skills simulator using readily available materials and a low-cost Web camera available from online shops. This arthroscopic simulation device can be used to improve skills of all levels of trainees at home, in a bioskills laboratory, or in the theater...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/27906472/long-term-clinical-impact-and-cost-effectiveness-of-obeticholic-acid-for-the-treatment-of-primary-biliary-cholangitis
#15
Sumeyye Samur, Matthew Klebanoff, Reiner Banken, Daniel S Pratt, Rick Chapman, Daniel A Ollendorf, Anne M Loos, Kathleen Corey, Chin Hur, Jagpreet Chhatwal
: Primary biliary cholangitis (PBC) is a chronic, progressive autoimmune liver disease that mainly affects middle-aged women. Obeticholic acid (OCA), which was recently approved by the Food and Drug Administration for PBC treatment, has demonstrated positive effects on biochemical markers of liver function. Our objective was to evaluate the long-term clinical impact and cost-effectiveness of OCA as a second-line treatment for PBC in combination with ursodeoxycholic acid (UDCA) in adults with an inadequate response to UDCA...
November 7, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/27898668/the-long-term-safety-public-health-impact-and-cost-effectiveness-of-routine-vaccination-with-a-recombinant-live-attenuated-dengue-vaccine-dengvaxia-a-model-comparison-study
#16
Stefan Flasche, Mark Jit, Isabel Rodríguez-Barraquer, Laurent Coudeville, Mario Recker, Katia Koelle, George Milne, Thomas J Hladish, T Alex Perkins, Derek A T Cummings, Ilaria Dorigatti, Daniel J Laydon, Guido España, Joel Kelso, Ira Longini, Jose Lourenco, Carl A B Pearson, Robert C Reiner, Luis Mier-Y-Terán-Romero, Kirsten Vannice, Neil Ferguson
BACKGROUND: Large Phase III trials across Asia and Latin America have recently demonstrated the efficacy of a recombinant, live-attenuated dengue vaccine (Dengvaxia) over the first 25 mo following vaccination. Subsequent data collected in the longer-term follow-up phase, however, have raised concerns about a potential increase in hospitalization risk of subsequent dengue infections, in particular among young, dengue-naïve vaccinees. We here report predictions from eight independent modelling groups on the long-term safety, public health impact, and cost-effectiveness of routine vaccination with Dengvaxia in a range of transmission settings, as characterised by seroprevalence levels among 9-y-olds (SP9)...
November 2016: PLoS Medicine
https://www.readbyqxmd.com/read/27890142/the-effects-of-a-simple-intervention-on-exposures-to-low-back-pain-risk-factors-during-traditional-posterior-load-carriage
#17
Khoirul Muslim, Maury A Nussbaum
Traditional posterior load carriage (PLC), typically performed without the use of an assistive device, is associated with a high prevalence of low back pain (LBP). However, there are few studies that have evaluated potential interventions to reduce exposures to LBP risk factors. This work examined the effects of a simple, potentially low-cost intervention using an assistive device (i.e., carrying aid) on exposures to factors related to LBP risk during PLC. Torso kinematics and kinetics, slip risk, and ratings of perceived discomfort (RPD) were obtained during simulated PLC on a walkway...
March 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/27868133/ensemble-pruning-for-glaucoma-detection-in-an-unbalanced-data-set
#18
Werner Adler, Olaf Gefeller, Asma Gul, Folkert K Horn, Zardad Khan, Berthold Lausen
BACKGROUND: Random forests are successful classifier ensemble methods consisting of typically 100 to 1000 classification trees. Ensemble pruning techniques reduce the computational cost, especially the memory demand, of random forests by reducing the number of trees without relevant loss of performance or even with increased performance of the sub-ensemble. The application to the problem of an early detection of glaucoma, a severe eye disease with low prevalence, based on topographical measurements of the eye background faces specific challenges...
December 7, 2016: Methods of Information in Medicine
https://www.readbyqxmd.com/read/27859465/meta-analysis-of-aggregate-data-on-medical-events
#19
Björn Holzhauer
Meta-analyses of clinical trials often treat the number of patients experiencing a medical event as binomially distributed when individual patient data for fitting standard time-to-event models are unavailable. Assuming identical drop-out time distributions across arms, random censorship, and low proportions of patients with an event, a binomial approach results in a valid test of the null hypothesis of no treatment effect with minimal loss in efficiency compared with time-to-event methods. To deal with differences in follow-up-at the cost of assuming specific distributions for event and drop-out times-we propose a hierarchical multivariate meta-analysis model using the aggregate data likelihood based on the number of cases, fatal cases, and discontinuations in each group, as well as the planned trial duration and groups sizes...
November 18, 2016: Statistics in Medicine
https://www.readbyqxmd.com/read/27842730/surgical-skills-curricula-in-american-college-of-surgeons-accredited-education-institutes-an-international-survey
#20
Iman Ghaderi, Shimae Fitzgibbons, Yusuke Watanabe, Alexander Lachapelle, John Paige
BACKGROUND: A clear understanding of simulation-based curricula in use at American College of Surgeons Accredited Education Institutes (ACS-AEIs) is lacking. METHODS: A 25-question online survey was sent to ACS-AEIs. RESULTS: The response rate approached 60%. The most frequent specialties to use the ACS-AEIs are general surgery and obstetrics/gynecology (94%). Residents are the main target population for programming/training (96%). Elements of the ACS/Association of Program Directors in Surgery Surgical Skills Curriculum are used by 77% of responding ACS-AEIs...
September 3, 2016: American Journal of Surgery
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