Accedi

Bibliografie tematiche / Cardiovascular system - Computer simulation / Articoli di riviste

Segui questo link per vedere altri tipi di pubblicazioni sul tema: Cardiovascular system - Computer simulation.

Articoli di riviste sul tema "Cardiovascular system - Computer simulation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 5 febbraio 2022

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Vedi i top-50 articoli di riviste per l'attività di ricerca sul tema "Cardiovascular system - Computer simulation".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Vedi gli articoli di riviste di molte aree scientifiche e compila una bibliografia corretta.

1

Bai, Jing, Hongli Lu, Jupeng Zhang, and Xiaoqiang Zhou. "Simulation Study of the Interaction between Respiration and the Cardiovascular System." Methods of Information in Medicine 36, no. 04/05 (October 1997): 261–63. http://dx.doi.org/10.1055/s-0038-1636875.

Testo completo

Abstract (sommario):

Abstract.Many studies have been done on the respiratory and the cardiovascular system. Among them, only a few are on the interaction of these two physiologic systems. To explore the mechanism of the integration of these two physiological systems, computer simulation has been done; we report the preliminary results obtained in our laboratory. In this study, a mathematical model of the cardiovascular system integrated with the respiratory mechanical system has been established. The model is based on our previous work on cardiovascular modeling. The previous lumped lungi model has been replaced b

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Masuzawa, Toru, Yasuhiro Fukui, and N. T. Smith. "Cardiovascular simulation using a multiple modeling method on a digital computer—Simulation of interaction between the cardiovascular system and angiotensin II." Journal of Clinical Monitoring 8, no. 1 (January 1992): 50–58. http://dx.doi.org/10.1007/bf01618088.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Neglia, D., G. Ferrari, F. Bernini, M. Micalizzi, A. L’Abbate, M. G. Trivella, and C. De Lazzari. "Computer Simulation of Coronary Flow Waveforms during Caval Occlusion." Methods of Information in Medicine 48, no. 02 (2009): 113–22. http://dx.doi.org/10.3414/me0539.

Testo completo

Abstract (sommario):

Summary Objectives: Mathematical modeling of the cardiovascular system is a powerful tool to extract physiologically relevant information from multi-parametric experiments. The purpose of the present work was to reproduce by means of a computer simulator, systemic and coronary measurements obtained by in vivo experiments in the pig. Methods: We monitored in anesthetized open-chest pig the phasic blood flow of the left descending coronary artery, aortic pressure, left ventricular pressure and volume. Data were acquired before, during, and after caval occlusion.Inside the software simulator (CAR

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Spicer, Sean A., and Charles A. Taylor. "Simulation-Based Medical Planning for Cardiovascular Disease: Visualization System Foundations." Computer Aided Surgery 5, no. 2 (January 2000): 82–89. http://dx.doi.org/10.3109/10929080009148874.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Spicer, Sean A., and Charles A. Taylor. "Simulation‐based medical planning for cardiovascular disease: Visualization system foundations." Computer Aided Surgery 5, no. 2 (2000): 82–89. http://dx.doi.org/10.1002/1097-0150(2000)5:2<82::aid-igs2>3.3.co;2-x.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Nebot, Angela, François E. Cellier, and Montserrat Vallverdú. "Mixed quantitative/qualitative modeling and simulation of the cardiovascular system." Computer Methods and Programs in Biomedicine 55, no. 2 (February 1998): 127–55. http://dx.doi.org/10.1016/s0169-2607(97)00056-4.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Sato, Toshiro, Akihiro Takeuchi, Jun Yamagami, Hareaki Yamamoto, Shigeaki Akiyama, Kyoko Endou, Masuo Shirataka, Noriaki Ikeda, and Harukazu Tsuruta. "Computer assisted instruction for therapy of heart failure based on simulation of cardiovascular system." ACM SIGBIO Newsletter 9, no. 1 (March 1987): 57–61. http://dx.doi.org/10.1145/25065.25066.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Bora, Şebnem, Vedat Evren, Sevcan Emek, and Ibrahim Çakırlar. "Agent-based modeling and simulation of blood vessels in the cardiovascular system." SIMULATION 95, no. 4 (June 9, 2017): 297–312. http://dx.doi.org/10.1177/0037549717712602.

Testo completo

Abstract (sommario):

The purpose of this study is to develop a model to simulate the behavior of the human cardiovascular system for use in medical education. The proposed model ensures that the output of the system is accurately represented in both equilibrium conditions and imbalance conditions including in the presence of adaptive agents. In this study, field experts develop an agent-based blood vessel model, i.e., a submodel for the stated purpose. In the proposed blood vessel model, vessels are represented by agents whereas blood flow is represented by the interaction between agents. Adaptive behavior shown b

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Smith, Bram W., Steen Andreassen, Geoffrey M. Shaw, Per L. Jensen, Stephen E. Rees, and J. Geoffrey Chase. "Simulation of cardiovascular system diseases by including the autonomic nervous system into a minimal model." Computer Methods and Programs in Biomedicine 86, no. 2 (May 2007): 153–60. http://dx.doi.org/10.1016/j.cmpb.2007.02.001.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Steele, B. N., M. T. Draney, J. P. Ku, and C. A. Taylor. "Internet-based system for simulation-based medical planning for cardiovascular disease." IEEE Transactions on Information Technology in Biomedicine 7, no. 2 (June 2003): 123–29. http://dx.doi.org/10.1109/titb.2003.811880.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

11

Raczynski, P., A. Dawid, Z. Dendzik, and Z. Gburski. "Computer Simulation of the Dynamics of Homocysteine Molecules Surrounding a Carbon Nanotube." Solid State Phenomena 140 (October 2008): 147–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.140.147.

Testo completo

Abstract (sommario):

Excessive amounts of homocysteine in the human body have been considered recently as a factor which increases the risk of developing diseases of the cardiovascular system. The nanosystem composed of homocysteine molecules covering a single walled carbon nanotube have been studied by MD technique. The translational and rotational velocity correlation functions have been calculated for several temperatures, including the physiological temperature of 309 K. The qualitative interpretation of translational and reorientational dynamics of homocysteine molecules in this specific environment is presen

Gli stili APA, Harvard, Vancouver, ISO e altri

12

de Canete, J. Fernandez, P. del Saz-Orozco, D. Moreno-Boza, and E. Duran-Venegas. "Object-oriented modeling and simulation of the closed loop cardiovascular system by using SIMSCAPE." Computers in Biology and Medicine 43, no. 4 (May 2013): 323–33. http://dx.doi.org/10.1016/j.compbiomed.2013.01.007.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

13

Ursino, M., M. Antonucci, and E. Belardinelli. "Role of active changes in venous capacity by the carotid baroreflex: analysis with a mathematical model." American Journal of Physiology-Heart and Circulatory Physiology 267, no. 6 (December 1, 1994): H2531—H2546. http://dx.doi.org/10.1152/ajpheart.1994.267.6.h2531.

Testo completo

Abstract (sommario):

To elucidate the role of venous capacity active changes in short-term cardiovascular homeostasis, a mathematical model of the carotid-sinus baroreflex system has been developed. In the model the cardiovascular system is represented as the series arrangement of six lumped compartments, which synthesize the fundamental hemodynamic properties of the systemic arterial, systemic venous, pulmonary arterial, and pulmonary venous circulations as well as of the left and right cardiac volumes. Cardiac outputs from the left and right ventricles are computed as a function of both downstream arterial press

Gli stili APA, Harvard, Vancouver, ISO e altri

14

Asami, Kenichi. "Design of a Human Circulation Modeling System for Fitness Training." Journal of Robotics and Mechatronics 17, no. 6 (December 20, 2005): 608–16. http://dx.doi.org/10.20965/jrm.2005.p0608.

Testo completo

Abstract (sommario):

A physiological modeling and simulation system to support fitness training in which the cardiovascular system model predicts pulsatile blood flows in response to exercise levels is presented. A circulation monitor and simulator that allow interaction of humans with health enhancement devices enable development of intelligent fitness machines. A modeling and simulation system of the human circulation is necessary to realize safe and effective machines. In order to construct a better architecture of the assisting framework, a modeling and simulation system for the human circulation for fitness w

Gli stili APA, Harvard, Vancouver, ISO e altri

15

Vallverdú, Montserrat, Carles Crexells, and Pere Caminal. "Cardiovascular responses to intrathoracic pressure variations in coronary disease patients: a computer simulation." Technology and Health Care 2, no. 2 (July 1, 1994): 119–40. http://dx.doi.org/10.3233/thc-1994-2207.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

16

Siddiqui, Shahan Yamin, Atifa Athar, Muhammad Adnan Khan, Sagheer Abbas, Yousaf Saeed, Muhammad Farrukh Khan, and Muhammad Hussain. "Modelling, Simulation and Optimization of Diagnosis Cardiovascular Disease Using Computational Intelligence Approaches." Journal of Medical Imaging and Health Informatics 10, no. 5 (May 1, 2020): 1005–22. http://dx.doi.org/10.1166/jmihi.2020.2996.

Testo completo

Abstract (sommario):

Background: To provide ease to diagnose that serious sickness multi-technique model is proposed. Data Analytics and Machine intelligence are involved in the detection of various diseases for human health care. The computer is used as a tool by experts in the medical field, and the computer-based mechanism is used to diagnose different diseases in patients with high Precision. Due to revolutionary measures employed in Artificial Neural Networks (ANNs) within the research domain in the medical area, which appear to be in the data-driven applications usually described in the domain of health care

Gli stili APA, Harvard, Vancouver, ISO e altri

17

Eblen-Zajjur, Antonio. "A SIMPLE BALLISTOCARDIOGRAPHIC SYSTEM FOR A MEDICAL CARDIOVASCULAR PHYSIOLOGY COURSE." Advances in Physiology Education 27, no. 4 (December 2003): 224–29. http://dx.doi.org/10.1152/advan.00025.2002.

Testo completo

Abstract (sommario):

Ballistocardiography is an old, noninvasive technique used to record the movements of the body synchronous with the heartbeat due to left ventricular pump activity. Despite the fact that this technique to measure cardiac output has been superseded by more advanced and precise techniques, it is useful for teaching cardiac cycle physiology in an undergraduate practical course because of its noninvasive application in humans, clear physiological and physiopathological analysis, and practical approach to considering cardiac output issues. In the present report, a simple, low cost, easy-to-build ba

Gli stili APA, Harvard, Vancouver, ISO e altri

18

Vollkron, Michael, Heinrich Schima, Leopold Huber, and Georg Wieselthaler. "Interaction of the Cardiovascular System with an Implanted Rotary Assist Device: Simulation Study with a Refined Computer Model>." Artificial Organs 26, no. 4 (April 2002): 349–59. http://dx.doi.org/10.1046/j.1525-1594.2002.06870.x.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

19

Leor-Librach, Ron Joseph, Ben-Zion Bobrovsky, Sarah Eliash, and Elieser Kaplinsky. "Computer-controlled heart rate increase by isoproterenol infusion: mathematical modeling of the system." American Journal of Physiology-Heart and Circulatory Physiology 277, no. 4 (October 1, 1999): H1478—H1483. http://dx.doi.org/10.1152/ajpheart.1999.277.4.h1478.

Testo completo

Abstract (sommario):

The purpose of this study was mathematical modeling of the heart rate (HR) response to isoproterenol (Iso) infusion. We developed a computerized system for the controlled increase of HR by Iso, based on a modified proportional-integral controller. HR was measured in conscious, freely moving rats. We found that the steady-state HR can be described as a hyperbolic power function of the steady-state Iso flow rate. This dependence was coupled with a first-order difference equation to form a pharmacodynamic model that reliably describes the relationship between HR and Iso flow for any arbitrary for

Gli stili APA, Harvard, Vancouver, ISO e altri

20

Ying Sun and Salvatore Chiaramida. "Simulation of hemodynamics and regulatory mechanisms in the cardiovascular system based on a nonlinear and time-varying model." SIMULATION 59, no. 1 (July 1992): 28–36. http://dx.doi.org/10.1177/003754979205900107.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

21

Nicol, S., and C. Narkowicz. "Learning physiology from cardiac surgery patients." Advances in Physiology Education 274, no. 6 (June 1998): S74. http://dx.doi.org/10.1152/advances.1998.274.6.s74.

Testo completo

Abstract (sommario):

A number of pressures have led to a very great reduction or complete abandonment of the use of animals in the teaching of physiology in most medical schools. Often animal experiments have been replaced by computer simulations, but a simulation is only as good as the model or algorithm on which it is based and can never contain the depth of information or unpredictability displayed by real animals or patients. We used a computer-based system to collect cardiovascular data from patients instrumented for cardiac surgery, allowing students to "replay" an operation. These recordings were annotated

Gli stili APA, Harvard, Vancouver, ISO e altri

22

Clemente, F., C. De Lazzari, M. Darowski, G. Ferrari, R. Mimmo, M. Guaragno, and G. Tosti. "Study of Systolic Pressure Variation (SPV) in Presence of Mechanical Ventilation." International Journal of Artificial Organs 25, no. 4 (April 2002): 313–20. http://dx.doi.org/10.1177/039139880202500410.

Testo completo

Abstract (sommario):

Systolic pressure variation (SPV) and its components (dUp and dDown) have been demonstrated to be of interest in assessing preload in mechanically ventilated patients. The aim of this paper is to analyse the sensitivity of these variables to preload and volemic changes during mechanical ventilation in different conditions of the cardiovascular system. Computer simulation experiments have been done using a modular lumped parameter model of the cardiovascular system. The effect of mechanical ventilation has been reproduced operating on intrathoracic pressure. Experiments have been performed vary

Gli stili APA, Harvard, Vancouver, ISO e altri

23

Banks, H. T., Kathleen Holm, Nathan C. Wanner, Ariel Cintrón-Arias, Grace M. Kepler, and Jeffrey D. Wetherington. "A mathematical model for the first-pass dynamics of antibiotics acting on the cardiovascular system." Mathematical and Computer Modelling 50, no. 7-8 (October 2009): 959–74. http://dx.doi.org/10.1016/j.mcm.2009.02.007.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

24

Yamada, Toshiyuki, Motohiko Osaka, Tomoya Uchimuro, Ryogen Yoon, Toshiaki Morikawa, Maki Sugimoto, Hisao Suda, and Hideyuki Shimizu. "Three-Dimensional Printing of Life-Like Models for Simulation and Training of Minimally Invasive Cardiac Surgery." Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery 12, no. 6 (November 2017): 459–65. http://dx.doi.org/10.1097/imi.0000000000000423.

Testo completo

Abstract (sommario):

Objective As the use of minimally invasive surgery in cardiothoracic surgery increases, so does the need for simulation and training. We developed a heart model for simulation and training of minimally invasive cardiac surgery, particularly minimally invasive mitral valve repair using our new three-dimensional printing system. Methods Digital imaging and communication in medicine data from patient computed tomography, three-dimensional computer-aided design, and three-dimensional printing helped create replicas of the heart and thoracic cavity. A polyvinyl alcohol model material with a texture

Gli stili APA, Harvard, Vancouver, ISO e altri

25

Ranftl, Sascha, Gian Marco Melito, Vahid Badeli, Alice Reinbacher-Köstinger, Katrin Ellermann, and Wolfgang von der Linden. "On the Diagnosis of Aortic Dissection with Impedance Cardiography: A Bayesian Feasibility Study Framework with Multi-Fidelity Simulation Data." Proceedings 33, no. 1 (December 9, 2019): 24. http://dx.doi.org/10.3390/proceedings2019033024.

Testo completo

Abstract (sommario):

Aortic dissection is a cardiovascular disease with a disconcertingly high mortality. When it comes to diagnosis, medical imaging techniques such as Computed Tomography, Magnetic Resonance Tomography or Ultrasound certainly do the job, but also have their shortcomings. Impedance cardiography is a standard method to monitor a patients heart function and circulatory system by injecting electric currents and measuring voltage drops between electrode pairs attached to the human body. If such measurements distinguished healthy from dissected aortas, one could improve clinical procedures. Experiments

Gli stili APA, Harvard, Vancouver, ISO e altri

26

Hope, I. D., F. J. Huikeshoven, R. D. Gilbert, G. G. Power, and L. D. Longo. "Errors in microsphere determination of cardiac output: a computer simulation in fetal sheep." American Journal of Physiology-Heart and Circulatory Physiology 256, no. 1 (January 1, 1989): H302—H310. http://dx.doi.org/10.1152/ajpheart.1989.256.1.h302.

Testo completo

Abstract (sommario):

Through use of a compartmental model, we simulated the measurement of cardiac output and distribution by means of radioactively labeled microspheres in fetal lambs with weights between 0.5 and 3 kg. A systematic error in measured cardiac output caused by artifactual changes in blood volume caused by the injection and withdrawal of fluids during the procedure was less than 5% for fetal weights greater than or equal to 1 kg but increased for fetal weights less than 1 kg and when hypovolemia was simulated at all fetal weights. Sensitivity analysis disclosed no significant effect of changes in vas

Gli stili APA, Harvard, Vancouver, ISO e altri

27

Shi, Yubing, and Theodosios Korakianitis. "Impeller-pump model derived from conservation laws applied to the simulation of the cardiovascular system coupled to heart-assist pumps." Computers in Biology and Medicine 93 (February 2018): 127–38. http://dx.doi.org/10.1016/j.compbiomed.2017.12.012.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

28

George, Jossy P., and Suhas M. Gaikwad. "Simulation modeling for heart attack patient by mapping cholesterol level." Indonesian Journal of Electrical Engineering and Computer Science 18, no. 1 (April 1, 2020): 16. http://dx.doi.org/10.11591/ijeecs.v18.i1.pp16-23.

Testo completo

Abstract (sommario):

<p>Cholesterol is a complex structural material made up of four-fused hydrocarbon rings. There is a hydrocarbon tail linked at one end of the structure, while the hydroxyl group linked to each other on the other end. To one end of the structure, a hydrocarbon tail linked and to the other end, a hydroxyl group linked to each other. High cholesterol level is one among the major risk factors of a heart attack. It is feasible to compute and control the cholesterol level of a cardiovascular patient by making use of intended Mathematical modeling in System Dynamics (S.D.). Moreover, by simulat

Gli stili APA, Harvard, Vancouver, ISO e altri

29

Le Rolle, Virginie, Alfredo I. Hernández, Pierre-Yves Richard, and Guy Carrault. "An Autonomic Nervous System Model Applied to the Analysis of Orthostatic Tests." Modelling and Simulation in Engineering 2008 (2008): 1–15. http://dx.doi.org/10.1155/2008/427926.

Testo completo

Abstract (sommario):

One of the clinical examinations performed to evaluate the autonomic nervous system (ANS) activity is the tilt test, which consists in studying the cardiovascular response to the change of a patient's position from a supine to a head-up position. The analysis of heart rate variability signals during tilt tests has been shown to be useful for risk stratification and diagnosis on different pathologies. However, the interpretation of such signals is a difficult task. The application of physiological models to assist the interpretation of these data has already been proposed in the literature, but

Gli stili APA, Harvard, Vancouver, ISO e altri

30

Bozkurt, Selim, and Koray K. Safak. "Evaluating the Hemodynamical Response of a Cardiovascular System under Support of a Continuous Flow Left Ventricular Assist Device via Numerical Modeling and Simulations." Computational and Mathematical Methods in Medicine 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/986430.

Testo completo

Abstract (sommario):

Dilated cardiomyopathy is the most common type of the heart failure which can be characterized by impaired ventricular contractility. Mechanical circulatory support devices were introduced into practice for the heart failure patients to bridge the time between the decision to transplant and the actual transplantation which is not sufficient due to the state of donor organ supply. In this study, the hemodynamic response of a cardiovascular system that includes a dilated cardiomyopathic heart under support of a newly developed continuous flow left ventricular assist device—Heart Turcica Axial—wa

Gli stili APA, Harvard, Vancouver, ISO e altri

31

Nazir Ahmed Kazi, Raisa, and Manjur Kolhar. "Smart Cardio Forecasting System for Patients with Cardiovascular Diseases Who Live Alone." Computers, Materials & Continua 66, no. 2 (2021): 1237–50. http://dx.doi.org/10.32604/cmc.2020.012707.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

32

Walker, Agnes, James R. G. Butler, and Stephen Colagiuri. "Economic model system of chronic diseases in Australia: a novel approach initially focusing on diabetes and cardiovascular disease." International Journal of Simulation and Process Modelling 6, no. 2 (2010): 137. http://dx.doi.org/10.1504/ijspm.2010.036018.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

33

Zhang, Yi, and H. Harry Asada. "Blind System Identification of Noncoprime Multichannel Systems and Its Application to Noninvasive Cardiovascular Monitoring." Journal of Dynamic Systems, Measurement, and Control 126, no. 4 (December 1, 2004): 834–47. http://dx.doi.org/10.1115/1.1852460.

Testo completo

Abstract (sommario):

Multichannel blind system identification (MBSI) is a technique for estimating both an unknown input and unknown channel dynamics from outputs measured at different points of the system. MBSI is a powerful tool particularly for the identification and estimation of dynamical systems in which a sensor, for measuring the input, is difficult to place. MBSI algorithms, however, are not applicable unless the transfer functions of individual channels are coprime, i.e., sharing no common dynamics among the channels. This paper presents a MBSI method, called intermediate input identification (IIID), app

Gli stili APA, Harvard, Vancouver, ISO e altri

34

Darowski, M., P. Wolski, G. Ferrari, G. Tosti, D. M. Pisanelli, and C. De Lazzari. "In Vivo and Simulation Study of Artificial Ventilation Effects on Energetic Variables in Cardiosurgical Patients." Methods of Information in Medicine 44, no. 01 (2005): 98–105. http://dx.doi.org/10.1055/s-0038-1633928.

Testo completo

Abstract (sommario):

Summary Objectives: The analysis of energetic ventricular variable changes during artificial ventilation, obtained by numerical simulation was done. Twenty-one sets of hemodynamic parameters for eight cardiosurgical patients were used to estimate left and right stroke work. The data were collected for three methods of ventilation: conventional, lung-protective (with minute ventilation diminished by half) and high frequency ventilation (with frequency 5, 10, or 15 Hz). Methods: The computer simulator (CARDIOSIM©) of the cardiovascular system, was used as a tool to calculate values of energetic

Gli stili APA, Harvard, Vancouver, ISO e altri

35

Mukherjee, Debasmita, Lakshmi Narayan Guin, and Santabrata Chakravarty. "Dynamical behavior of a mathematical model of early atherosclerosis." International Journal of Modeling, Simulation, and Scientific Computing 11, no. 01 (February 2020): 2050006. http://dx.doi.org/10.1142/s1793962320500063.

Testo completo

Abstract (sommario):

Atherosclerosis, a continual inflammatory disease occurring due to plaque cumulation in the arterial intima, is one of the main reasons behind deaths from diverse cardiovascular diseases. The basic interactions between oxidized low density lipoprotein (LDL) and macrophages in the formation of atherosclerotic plaque are modeled here in terms of a reaction–diffusion system in one-dimensional (1D) space under Neumann boundary conditions. Two simple mathematical models are considered which differ by the influx term only in the case of the interaction of oxidized LDL. Both the spatial and nonspatia

Gli stili APA, Harvard, Vancouver, ISO e altri

36

Lyakhov, Pavel, Mariya Kiladze, and Ulyana Lyakhova. "System for Neural Network Determination of Atrial Fibrillation on ECG Signals with Wavelet-Based Preprocessing." Applied Sciences 11, no. 16 (August 5, 2021): 7213. http://dx.doi.org/10.3390/app11167213.

Testo completo

Abstract (sommario):

Today, cardiovascular disease is the leading cause of death in developed countries. The most common arrhythmia is atrial fibrillation, which increases the risk of ischemic stroke. An electrocardiogram is one of the best methods for diagnosing cardiac arrhythmias. Often, the signals of the electrocardiogram are distorted by noises of varying nature. In this paper, we propose a neural network classification system for electrocardiogram signals based on the Long Short-Term Memory neural network architecture with a preprocessing stage. Signal preprocessing was carried out using a symlet wavelet fi

Gli stili APA, Harvard, Vancouver, ISO e altri

37

Puiseux, Thomas, Anou Sewonu, Ramiro Moreno, Simon Mendez, and Franck Nicoud. "Numerical simulation of time-resolved 3D phase-contrast magnetic resonance imaging." PLOS ONE 16, no. 3 (March 26, 2021): e0248816. http://dx.doi.org/10.1371/journal.pone.0248816.

Testo completo

Abstract (sommario):

A numerical approach is presented to efficiently simulate time-resolved 3D phase-contrast Magnetic resonance Imaging (or 4D Flow MRI) acquisitions under realistic flow conditions. The Navier-Stokes and Bloch equations are simultaneously solved with an Eulerian-Lagrangian formalism. A semi-analytic solution for the Bloch equations as well as a periodic particle seeding strategy are developed to reduce the computational cost. The velocity reconstruction pipeline is first validated by considering a Poiseuille flow configuration. The 4D Flow MRI simulation procedure is then applied to the flow wit

Gli stili APA, Harvard, Vancouver, ISO e altri

38

GIANNERINI, SIMONE, RODOLFO ROSA, and DIEGO LUIS GONZALEZ. "TESTING CHAOTIC DYNAMICS IN SYSTEMS WITH TWO POSITIVE LYAPUNOV EXPONENTS: A BOOTSTRAP SOLUTION." International Journal of Bifurcation and Chaos 17, no. 01 (January 2007): 169–82. http://dx.doi.org/10.1142/s0218127407017240.

Testo completo

Abstract (sommario):

The present paper is devoted to the problem of detecting the presence of two positive Lyapunov exponents in time series data. In order to accomplish this task the accuracy of the estimates is essential, but existing estimation approaches do not provide it. We present a procedure exploiting resampling methods for building a statistical test for the presence of two positive exponents of comparable magnitudes through rigorous assessment of confidence intervals. The problem is studied by means of computer experiments performed in a variety of conditions on coupled Lorenz systems. Then, a case stud

Gli stili APA, Harvard, Vancouver, ISO e altri

39

Horwitz, Barry. "Functional Interactions in the Brain: Use of Correlations between Regional Metabolic Rates." Journal of Cerebral Blood Flow & Metabolism 11, no. 1_suppl (March 1991): A114—A120. http://dx.doi.org/10.1038/jcbfm.1991.46.

Testo completo

Abstract (sommario):

Correlation coefficients between pairs of regional metabolic rates have been used to study patterns of functional associations among brain regions in humans and animals. An overview is provided concerning the additional information about brain functioning this type of analysis yields. A computer simulation model is presented for the purpose of giving a partial validation for correlational analysis. The model generates a set of simulated metabolic data upon which correlational analysis is performed. Because the underlying pattern of functional couplings in the model is known, these simulations

Gli stili APA, Harvard, Vancouver, ISO e altri

40

Bucurenciu, Cristian, Victor S. Costache, and Gabriela S. Cândea. "Study of aortic dissections treatment. Segmentation, simulation and valiadation of surgical results." MATEC Web of Conferences 290 (2019): 04004. http://dx.doi.org/10.1051/matecconf/201929004004.

Testo completo

Abstract (sommario):

Nowadays, Computational Fluid Dynamics (CFD) it’s seen as the new trend in the management of aortic pathologies. Together with visualization capabilities of cardiovascular magnetic resonance (CMR) and computed tomography (CT) imaging, real time segmentation (volumetric) models further used as meshes in Computational Fluid Dynamic supply to the clinicians an innovative and extensive decision-making system. In the present paper, we identified and analysed the clinical indicators (lumens diameters, fenestrated area and blood volume) monitored by clinicians to evaluate the patient’ condition befor

Gli stili APA, Harvard, Vancouver, ISO e altri

41

Benharash, Peyman, Paul Frank, and Brenda Hoy. "Development and Use of a Novel Cardiovascular Simulator: Time for a Paradigm Shift?" American Surgeon 78, no. 10 (October 2012): 1132–36. http://dx.doi.org/10.1177/000313481207801027.

Testo completo

Abstract (sommario):

Understanding cardiovascular physiology, pharmacology, and treatment of shock is heavily emphasized in current medical school and surgical training. Performance of individuals in treatment of critical illness remains poor despite regular didactic sessions. We have developed a PC computer-based simulator capable of integrating basic hemodynamic parameters to dynamically generate a realistic patient monitor. The methodology includes physiological feedback as found in humans. The trainees are able to learn through a series of scenarios or ad lib manipulation of parameters. Participants including

Gli stili APA, Harvard, Vancouver, ISO e altri

42

Giovannetti, Giulio, Alessandra Flori, Maria Filomena Santarelli, Vincenzo Positano, Nicola Martini, Roberto Francischello, Rolf F. Schulte, et al. "Radio Frequency Coils for Hyperpolarized 13C Magnetic Resonance Experiments with a 3T MR Clinical Scanner: Experience from a Cardiovascular Lab." Electronics 10, no. 4 (February 3, 2021): 366. http://dx.doi.org/10.3390/electronics10040366.

Testo completo

Abstract (sommario):

Hyperpolarized 13C magnetic resonance (MR) is a promising technique for the noninvasive assessment of the regional cardiac metabolism since it permits heart physiology studies in pig and mouse models. The main objective of the present study is to resume the work carried out at our electromagnetic laboratory in the field of radio frequency (RF) coil design, building, and testing. In this paper, first, we review the principles of RF coils, coil performance parameters, and estimation methods by using simulations, workbench, and MR imaging experiments. Then, we describe the simulation, design, and

Gli stili APA, Harvard, Vancouver, ISO e altri

43

Suhail, M. Mohamed, and T. Abdul Razak. "ECG Classification Framework for Cardiac Disease Prediction Using Nonlinear Vector Decomposed Neural Network." Journal of Computational and Theoretical Nanoscience 17, no. 12 (December 1, 2020): 5563–69. http://dx.doi.org/10.1166/jctn.2020.9453.

Testo completo

Abstract (sommario):

Early detection of heart disease may prevent myocardial infarction. Electrocardiogram (ECG) is the most widely used signal in clinical practice for the diagnosis of cardiovascular diseases such as arrhythmias and myocardial infarction. Human interpretation is time-consuming, and long-term ECG records are difficult to detect in small differences.Therefore, automated recognition of myocardial infarction using a Computer-Aided Diagnosis (CAD) system is the research interest, which can be used effectively to reduce mortality among cardiovascular disease patients. The most important step in the ana

Gli stili APA, Harvard, Vancouver, ISO e altri

44

Vijaya, Kalavakonda, H. Khanna Nehemiah, A. Kannan, and N. G. Bhuvaneswari. "Fuzzy neuro genetic approach for predicting the risk of cardiovascular diseases." International Journal of Data Mining, Modelling and Management 2, no. 4 (2010): 388. http://dx.doi.org/10.1504/ijdmmm.2010.035565.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

45

Keissar, Kobi, Linda R. Davrath, and Solange Akselrod. "Coherence analysis between respiration and heart rate variability using continuous wavelet transform." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367, no. 1892 (February 27, 2009): 1393–406. http://dx.doi.org/10.1098/rsta.2008.0273.

Testo completo

Abstract (sommario):

The continuous wavelet transform (CWT) is specifically efficient in the analysis of transient and non-stationary signals. As such, it has become a powerful candidate for time–frequency analysis of cardiovascular variability. CWT has already been established as a valid tool for the analysis of single cardiovascular signals, providing additional insights into the autonomous nervous system (ANS) activity and its control mechanism. Intercorrelation between cardiovascular signals elucidates the function of ANS central control and the peripheral reflex mechanisms. Wavelet transform coherence (WTC) c

Gli stili APA, Harvard, Vancouver, ISO e altri

46

Choi, Hyo Won, Zhen-Du Zhang, Neil D. Farren, and Ghassan S. Kassab. "Implications of complex anatomical junctions on conductance catheter measurements of coronary arteries." Journal of Applied Physiology 114, no. 5 (March 1, 2013): 656–64. http://dx.doi.org/10.1152/japplphysiol.00987.2012.

Testo completo

Abstract (sommario):

In vivo, the position of the conductance catheter to measure vessel lumen cross-sectional area may vary depending on where the conductance catheter is deployed in the complex anatomical geometry of arteries, including branches, bifurcations, or curvatures. The objective here is to determine how such geometric variations affect the cross-sectional area (CSA) estimates obtained using the cylindrical model. Computer simulations and in vitro and in vivo experiments were used to assess how the electric field and associated CSA measurement accuracy are affected by three typical in vivo conditions: 1

Gli stili APA, Harvard, Vancouver, ISO e altri

47

Yavorska, Evhenia, Oksana Strembitska, Michael Strembitskyi, and Iryna Pankiv. "Development of a simulation model of a photoplethysmographic signal under psychoemotional stress." Eastern-European Journal of Enterprise Technologies 2, no. 9 (110) (April 30, 2021): 36–45. http://dx.doi.org/10.15587/1729-4061.2021.227001.

Testo completo

Abstract (sommario):

A simulation model of a photoplethysmographic signal under psychoemotional stress taking into account the nature of signals of biological origin and stress response stages was developed. The method of constructing the simulation model is based on reconstructing the waveform and coding points of the signal taking into account the stress response curve using harmonic functions at characteristic time intervals. Using the simulation model of the photoplethysmographic signal under psychoemotional stress with previously known parameters allows validation of methods and algorithms for processing such

Gli stili APA, Harvard, Vancouver, ISO e altri

48

de Oliveira, Amanda Almeida, Josemar Faustino, Maria Elena de Lima, Ronaldo Menezes, and Kenia Pedrosa Nunes. "Unveiling the Interplay between the TLR4/MD2 Complex and HSP70 in the Human Cardiovascular System: A Computational Approach." International Journal of Molecular Sciences 20, no. 13 (June 26, 2019): 3121. http://dx.doi.org/10.3390/ijms20133121.

Testo completo

Abstract (sommario):

While precise mechanisms underlying cardiovascular diseases (CVDs) are still not fully understood, previous studies suggest that the innate immune system, through Toll-like receptor 4 (TLR4), plays a crucial part in the pathways leading to these diseases, mainly because of its interplay with endogenous molecules. The Heat-shock protein 70 family (HSP70-70kDa) is of particular interest in cardiovascular tissues as it may have dual effects when interacting with TLR4 pathways. Although the hypothesis of the HSP70 family members acting as TLR4 ligands is becoming widely accepted, to date no co-cry

Gli stili APA, Harvard, Vancouver, ISO e altri

49

Madwed, J. B., P. Albrecht, R. G. Mark, and R. J. Cohen. "Low-frequency oscillations in arterial pressure and heart rate: a simple computer model." American Journal of Physiology-Heart and Circulatory Physiology 256, no. 6 (June 1, 1989): H1573—H1579. http://dx.doi.org/10.1152/ajpheart.1989.256.6.h1573.

Testo completo

Abstract (sommario):

We have previously reported that low-frequency oscillations in arterial blood pressure (ABP) and heart rate (HR) occur when conscious dogs experience severe blood loss. These low-frequency oscillations are generated by enhancement of the sympathetic nervous system and inhibition of the parasympathetic nervous system. We have developed a simple computer model to elucidate those properties critical to the generation of these oscillations. Our model incorporates several important features: 1) arterial baroreceptor feedback loops, which relate ABP to targeted HR and total peripheral resistance (TP

Gli stili APA, Harvard, Vancouver, ISO e altri

50

WANG, WENXIN, YOUJUN LIU, XI ZHAO, JINSHENG XIE, and AIKE QIAO. "HEMODYNAMICS-BASED LONG-TERM PATENCY OF DIFFERENT SEQUENTIAL GRAFTING: A PATIENT-SPECIFIC MULTI-SCALE STUDY." Journal of Mechanics in Medicine and Biology 17, no. 01 (February 2017): 1750017. http://dx.doi.org/10.1142/s0219519417500178.

Testo completo

Abstract (sommario):

Background and aims: Sequential grafting is one of the common coronary artery bypass grafting (CABG) surgery. But the influence of the sequential grafting position on hemodynamics and the graft patency is still unclear. Materials and methods: The zero-dimensional/three-dimensional (0D/3D) coupling method was used to finalize the multi-scale simulation of two different sequential grafting models. First, a patient-specific 3D model was reconstructed based on coronary computed tomography angiography (CCTA) images. Two different sequential grafts were implemented on this patient-specific 3D model

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!