keyword
MENU ▼
Read by QxMD icon Read
search

Simulated patients

keyword
https://www.readbyqxmd.com/read/28651099/brain-shift-compensation-using-intraoperative-ultrasound-and-constraint-based-biomechanical-simulation
#1
Fanny Morin, Hadrien Courtecuisse, Ingerid Reinertsen, Florian Le Lann, Olivier Palombi, Yohan Payan, Matthieu Chabanas
PURPOSE: During brain tumor surgery, planning and guidance are based on preoperative images which do not account for brain-shift. However, this deformation is a major source of error in image-guided neurosurgery and affects the accuracy of the procedure. In this paper, we present a constraint-based biomechanical simulation method to compensate for craniotomy-induced brain-shift that integrates the deformations of the blood vessels and cortical surface, using a single intraoperative ultrasound acquisition...
June 15, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28651023/many-to-one-comparisons-after-safety-selection-in-multi-arm-clinical-trials
#2
Gerald Hlavin, Lisa V Hampson, Franz Koenig
In phase II platform trials, 'many-to-one' comparisons are performed when K experimental treatments are compared with a common control to identify the most promising treatment(s) to be selected for Phase III trials. However, when sample sizes are limited, such as when the disease of interest is rare, only a single Phase II/III trial addressing both treatment selection and confirmatory efficacy testing may be feasible. In this paper, we suggest a two-step safety selection and testing procedure for such seamless trials...
2017: PloS One
https://www.readbyqxmd.com/read/28650562/the-economic-value-of-hybrid-single-photon-emission-computed-tomography-with-computed-tomography-imaging-in-pulmonary-embolism-diagnosis
#3
Lauren K Toney, Richard D Kim, Swetha R Palli
OBJECTIVE: To quantify the potential economic value of single-photon emission computed tomography (SPECT) with computed tomography (CT; SPECT/CT) versus CT pulmonary angiography (CTPA), ventilation-perfusion (V/Q) planar scintigraphy and V/Q SPECT imaging modalities for diagnosing suspected pulmonary embolism (PE) patients in an emergency setting. METHODS: An Excel-based simulation model was developed to compare SPECT/CT versus the alternate scanning technologies from a payer's perspective...
June 26, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/28650363/population-pharmacokinetics-and-pharmacodynamic-target-attainment-of-vancomycin-in-neonates-on-extracorporeal-life-support
#4
Jeffrey J Cies, Wayne S Moore, Kristen Nichols, Chad A Knoderer, Dominick M Carella, Arun Chopra
OBJECTIVES: To evaluate the population pharmacokinetics and pharmacodynamic target attainment of vancomycin in neonates with a contemporary ¼-inch extracorporeal life support circuit with a Quadrox-iD Pediatric oxygenator (Maquet Cardiovascular, LLC, Wayne, NJ). DESIGN: Retrospective medical record review. SETTING: Two free-standing tertiary/quaternary pediatric children's hospitals. PATIENTS: Neonates receiving either veno-arterial or veno-venous extracorporeal life support and vancomycin for empiric or definitive therapy with resulting serum concentrations...
June 22, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28650086/systemic-thrombolysis-catheter-directed-thrombolysis-and-anticoagulation-for-intermediate-risk-pulmonary-embolism-a-simulation-modeling-analysis
#5
Christopher Kabrhel, Ayman Ali, Jin Choi, Chin Hur
OBJECTIVES: Decision-making around the use of thrombolysis for patients with intermediate-risk (submassive) PE remains challenging. Studies indicate favorable clinical outcomes with systemic thrombolytics (IV tPA), but the risk of major bleeding and hemorrhagic stroke is a deterrent. Catheter-directed thrombolysis (CDT) may be a preferable strategy, as it has been shown to have a lower risk of bleeding than systemic thrombolysis. However, a three-arm randomized control study comparing IV tPA, CDT, and anticoagulation alone, with long-term follow up, would be costly and is unlikely to be performed...
June 26, 2017: Academic Emergency Medicine: Official Journal of the Society for Academic Emergency Medicine
https://www.readbyqxmd.com/read/28649949/diagnostic-performance-of-a-lattice-boltzmann-based-method-for-fast-ct-fractional-flow-reserve
#6
Andreas Giannopoulos, Anji Tang, Yin Ge, Michael Cheezum, Michael Steigner, Shinichiro Fujimoto, Kanako Kumamaru, Dante Chiappino, Daniele Della Latta, Sergio Berti, Sara Chiappino, Frank Rybicki, Simone Melchionna, Dimitrios Mitsouras
AIMS: Fractional flow reserve (FFR) estimated from coronary computed tomography angiography (CT-FFR) offers non-invasive detection of lesion-specific ischemia. We developed and validated a fast CT-FFR algorithm utilizing the Lattice-Boltzmann Method for blood flow simulation (LBM CT-FFR). METHODS AND RESULTS: 64 patients from 3 institutions with clinically-indicated CTA and invasive FFR measurement were retrospectively analyzed. CT-FFR was performed using an on-site tool interfacing with a commercial Lattice-Boltzmann fluid dynamics cloud-based platform...
June 27, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28649708/potential-benefits-of-crawl-position-for-prone-radiation-therapy-in-breast-cancer
#7
Bert Boute, Wilfried De Neve, Bruno Speleers, Annick Van Greveling, Christel Monten, Tom Van Hoof, Joris Van de Velde, Leen Paelinck, Werner De Gersem, Tom Vercauteren, Jan Detand, Liv Veldeman
PURPOSE: To investigate crawl position with the arm at the treated side alongside the body and at the opposite side above the head for prone treatment in patients requiring breast and regional lymph node irradiation. METHODS: Patient support devices for crawl position were built for CT simulation and treatment. An asymmetric fork design resulted from an iterative process of prototype construction and testing. The fork's large horn supports the hemi-thorax, shoulder, and elevated arm at the nontreated side and the head...
June 26, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28649441/clinical-responses-to-erk-inhibition-in-braf-v600e-mutant-colorectal-cancer-predicted-using-a-computational-model
#8
Daniel C Kirouac, Gabriele Schaefer, Jocelyn Chan, Mark Merchant, Christine Orr, Shih-Min A Huang, John Moffat, Lichuan Liu, Kapil Gadkar, Saroja Ramanujan
Approximately 10% of colorectal cancers harbor BRAF(V600E) mutations, which constitutively activate the MAPK signaling pathway. We sought to determine whether ERK inhibitor (GDC-0994)-containing regimens may be of clinical benefit to these patients based on data from in vitro (cell line) and in vivo (cell- and patient-derived xenograft) studies of cetuximab (EGFR), vemurafenib (BRAF), cobimetinib (MEK), and GDC-0994 (ERK) combinations. Preclinical data was used to develop a mechanism-based computational model linking cell surface receptor (EGFR) activation, the MAPK signaling pathway, and tumor growth...
2017: NPJ Systems Biology and Applications
https://www.readbyqxmd.com/read/28649438/translational-learning-from-clinical-studies-predicts-drug-pharmacokinetics-across-patient-populations
#9
Markus Krauss, Ute Hofmann, Clemens Schafmayer, Svitlana Igel, Jan Schlender, Christian Mueller, Mario Brosch, Witigo von Schoenfels, Wiebke Erhart, Andreas Schuppert, Michael Block, Elke Schaeffeler, Gabriele Boehmer, Linus Goerlitz, Jan Hoecker, Joerg Lippert, Reinhold Kerb, Jochen Hampe, Lars Kuepfer, Matthias Schwab
Early indication of late-stage failure of novel candidate drugs could be facilitated by continuous integration, assessment, and transfer of knowledge acquired along pharmaceutical development programs. We here present a translational systems pharmacology workflow that combines drug cocktail probing in a specifically designed clinical study, physiologically based pharmacokinetic modeling, and Bayesian statistics to identify and transfer (patho-)physiological and drug-specific knowledge across distinct patient populations...
2017: NPJ Systems Biology and Applications
https://www.readbyqxmd.com/read/28649432/an-individual-based-model-for-collective-cancer-cell-migration-explains-speed-dynamics-and-phenotype-variability-in-response-to-growth-factors
#10
Damian Stichel, Alistair M Middleton, Benedikt F Müller, Sofia Depner, Ursula Klingmüller, Kai Breuhahn, Franziska Matthäus
Collective cell migration is a common phenotype in epithelial cancers, which is associated with tumor cell metastasis and poor patient survival. However, the interplay between physiologically relevant pro-migratory stimuli and the underlying mechanical cell-cell interactions are poorly understood. We investigated the migratory behavior of different collectively migrating non-small cell lung cancer cell lines in response to motogenic growth factors (e.g. epidermal growth factor) or clinically relevant small compound inhibitors...
2017: NPJ Systems Biology and Applications
https://www.readbyqxmd.com/read/28649159/initial-simulated-ffr-investigation-using-flow-measurements-in-patient-specific-3d-printed-coronary-phantoms
#11
Lauren Shepard, Kelsey Sommer, Richard Izzo, Alexander Podgorsak, Michael Wilson, Zaid Said, Frank J Rybicki, Dimitrios Mitsouras, Stephen Rudin, Erin Angel, Ciprian N Ionita
PURPOSE: Accurate patient-specific phantoms for device testing or endovascular treatment planning can be 3D printed. We expand the applicability of this approach for cardiovascular disease, in particular, for CT-geometry derived benchtop measurements of Fractional Flow Reserve, the reference standard for determination of significant individual coronary artery atherosclerotic lesions. MATERIALS AND METHODS: Coronary CT Angiography (CTA) images during a single heartbeat were acquired with a 320×0...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28649157/use-of-patient-specific-3d-printed-neurovascular-phantoms-to-evaluate-the-clinical-utility-of-a-high-resolution-x-ray-imager
#12
S V Setlur Nagesh, M Russ, C N Ionita, D Bednarek, S Rudin
Modern 3D printing technology can fabricate vascular phantoms based on an actual human patient with a high degree of precision facilitating a realistic simulation environment for an intervention. We present two experimental setups using 3D printed patient-specific neurovasculature to simulate different disease anatomies. To simulate the human neurovasculature in the Circle of Willis, patient-based phantoms with aneurysms were 3D printed using a Objet Eden 260V printer. Anthropomorphic head phantoms and a human skull combined with acrylic plates simulated human head bone anatomy and x-ray attenuation...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28649154/skin-dose-mapping-for-non-uniform-x-ray-fields-using-a-backscatter-point-spread-function
#13
Sarath Vijayan, Zhenyu Xiong, Alok Shankar, Stephen Rudin, Daniel R Bednarek
Beam shaping devices like ROI attenuators and compensation filters modulate the intensity distribution of the x-ray beam incident on the patient. This results in a spatial variation of skin dose due to the variation of primary radiation and also a variation in backscattered radiation from the patient. To determine the backscatter component, backscatter point spread functions (PSF) are generated using EGS Monte-Carlo software. For this study, PSF's were determined by simulating a 1 mm beam incident on the lateral surface of an anthropomorphic head phantom and a 20 cm thick PMMA block phantom...
February 11, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28649147/multiblock-high-order-large-eddy-simulation-of-powered-fontan-hemodynamics-towards-computational-surgery
#14
Yann T Delorme, Mark D Rodefeld, Steven H Frankel
Children born with only one functional ventricle must typically undergo a series of three surgeries to obtain the so-called Fontan circulation in which the blood coming from the body passively flows from the Vena Cavae (VCs) to the Pulmonary Arteries (PAs) through the Total Cavopulmonary Connection (TCPC). The circulation is inherently inefficient due to the lack of a subpulmonary ventricle. Survivors face the risk of circulatory sequelae and eventual failure for the duration of their lives. Current efforts are focused on improving the outcomes of Fontan palliation, either passively by optimizing the TCPC, or actively by using mechanical support...
January 17, 2017: Computers & Fluids
https://www.readbyqxmd.com/read/28648990/a-numerical-experimental-protocol-to-characterize-corneal-tissue-with-an-application-to-predict-astigmatic-keratotomy-surgery
#15
M Á Ariza-Gracia, Á Ortillés, J Á Cristóbal, J F Rodríguez Matas, B Calvo
Tonometers are intended to determine the intraocular pressure (IOP) and the quality of corneal tissue. In contrast to the physiological state of stress of the cornea, tonometers induce non-physiological bending stress. Recently, the use of a single experiment to calibrate a set of corneal mechanical properties was suggested to be an ill-posed problem. Thus, we propose a numerical-experimental protocol that uses inflation and indentation experiments simultaneously, restricting the optimization space to circumvent the ambiguity of the fitting...
June 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28648702/a-dual-pivot-pattern-simulating-native-knee-kinematics-optimizes-functional-outcomes-after-total-knee-arthroplasty
#16
R Michael Meneghini, Evan R Deckard, Marshall K Ishmael, Mary Ziemba-Davis
BACKGROUND: Few studies on kinematics correlate patterns to functional outcomes after total knee arthroplasty (TKA). The purpose of this study was to determine if lateral pivot motion in early flexion and medial pivot in high flexion, simulating native knee kinematics, produces superior clinical outcomes. A second objective was to determine if specific kinematic patterns produce superior outcomes. METHODS: One hundred twenty consecutive TKAs were performed using sensor trials to record intraoperative knee kinematics...
May 4, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28648321/cost-utility-analysis-of-single-fraction-versus-multiple-fraction-radiotherapy-in-patients-with-painful-bone-metastases-an-iranian-patient-s-perspective-study
#17
Yahya Bayazidi, Ali Keshtkaran, Enayatollah Homaie Rad, Mansour Ansari, Mehdi Javanbakht, Amir Hashemi Meshkini, Shokoufeh Nikfar, Pardis Zaboli
OBJECTIVES: To evaluate two of the various treatment strategies of bone metastasis- single-fraction radiotherapy and multiple-fraction radiotherapy. METHODS: A multistage Markov decision model was applied to assess the incremental costs per quality-adjusted life-year (QALY) gained of single fraction against multiple fractions. The model had a monthly cycle length over a lifetime horizon with 1000 hypothetical cohort samples. The EuroQol five-dimensional questionnaire was used to estimate the health-related quality of life in patients...
May 2017: Value in Health Regional Issues
https://www.readbyqxmd.com/read/28648115/complete-thoracolumbar-fracture-dislocation-with-intact-neurologic-function-explanation-of-a-novel-cord-saving-mechanism
#18
Abolfazl Rahimizadeh, Naser Asgari, Ava Rahimizadeh
BACKGROUND: The thoracolumbar junction from T11 to L2 is a common site of injury in which fracture and dislocations are the most prevalent ones occurring at this location. Fracture dislocation is defined as failure of all three columns of the spine with gross displacement. Considering the significant violence necessary to produce fracture dislocations, these injuries are often associated with major neural deficit, with the majority of casualties becoming paraplegic immediately. Preservation of neurological function following complete fracture dislocation is quite rare entity...
June 26, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28647933/a-new-system-of-documentation-to-improve-dietitian-physician-crosstalk
#19
Shelly Rachman-Elbaum, Aliza H Stark, Josefa Kachal, Teresa W Johnson, Bat Sheva Porat-Katz
BACKGROUND: Standardization of the dietetic care process allows for early identification of malnutrition and metabolic disorders, interdisciplinary collaboration among the medical team, and improved quality of patient care. Globally, dietitians are adopting a nutrition care model that integrates national regulations with professional scope of practice. Currently, Israel lacks a standardized dietetic care process and documentation terminology. OBJECTIVES: To assess the utilization of a novel sectoral documentation system for nutrition care in Israel...
June 2017: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/28647655/face-content-and-construct-validity-of-an-aneurysm-clipping-model-using-human-placenta
#20
Evgenii Belykh, Eric J Miller, Ting Lei, Kristina Chapple, Vadim A Byvaltsev, Robert F Spetzler, Peter Nakaji, Mark C Preul
OBJECTIVE: Proficient open surgical treatment of cerebral aneurysms requires extensive training and practice. The goal of this study was to test the validity of a human placenta aneurysm model for surgical simulation training of aneurysm clipping. METHODS: Thirty participants were divided into 3 groups (n=10 per group) according to their neurosurgical experience: low experience, intermediate experience, and attending. Subjective measures were collected using the Aneurysm Clipping Participant Survey (n=27)...
June 21, 2017: World Neurosurgery
keyword
keyword
61367
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"