614 resources related to Cardiovascular system
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2021 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)
FUZZ-IEEE 2021 will represent a unique meeting point for scientists and engineers, both from academia and industry, to interact and discuss the latest enhancements and innovations in the field. The topics of the conference will cover all the aspects of theory and applications of fuzzy sets, fuzzy logic and associated approaches (e.g. aggregation operators such as the Fuzzy Integral), as well as their hybridizations with other artificial and computational intelligence techniques.
The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE
The ACC is the annual conference of the American Automatic Control Council (AACC, the U.S. national member organization of the International Federation for Automatic Control (IFAC)). The ACC is internationally recognized as a premier scientific and engineering conference dedicated to the advancement of control theory and practice. The ACC brings together an international community of researchers and practitioners to discuss the latest findings in automatic control. The 2020 ACC technical program will
2020 IEEE 17th International Symposium on Biomedical Imaging (ISBI 2020)
The IEEE International Symposium on Biomedical Imaging (ISBI) is the premier forum for the presentation of technological advances in theoretical and applied biomedical imaging. ISBI 2020 will be the 17th meeting in this series. The previous meetings have played a leading role in facilitating interaction between researchers in medical and biological imaging. The 2020 meeting will continue this tradition of fostering cross-fertilization among different imaging communities and contributing to an integrative approach to biomedical imaging across all scales of observation.
The International Conference on Robotics and Automation (ICRA) is the IEEE Robotics and Automation Society’s biggest conference and one of the leading international forums for robotics researchers to present their work.
The Transactions on Biomedical Circuits and Systems addresses areas at the crossroads of Circuits and Systems and Life Sciences. The main emphasis is on microelectronic issues in a wide range of applications found in life sciences, physical sciences and engineering. The primary goal of the journal is to bridge the unique scientific and technical activities of the Circuits and Systems ...
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.
Physics, medicine, astronomy—these and other hard sciences share a common need for efficient algorithms, system software, and computer architecture to address large computational problems. And yet, useful advances in computational techniques that could benefit many researchers are rarely shared. To meet that need, Computing in Science & Engineering (CiSE) presents scientific and computational contributions in a clear and accessible format. ...
Serves as a compendium for papers on the technological advances in control engineering and as an archival publication which will bridge the gap between theory and practice. Papers will highlight the latest knowledge, exploratory developments, and practical applications in all aspects of the technology needed to implement control systems from analysis and design through simulation and hardware.
IEE Colloquium on Technological Progress in Cardiology, 1990
Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1996
The primary role of the cardiovascular system is to deliver a required amount of oxygen to various organs. These needs vary with time and depend on the vascular site. To maintain a required diffusion level of oxygen in the capillary networks, the cardiovascular system is controlled by regulation processes that maintain pressure and blood flow to the required physiological levels. ...
Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1996
The authors have geometrically investigated the relationship among the state- dependent cardiovascular dynamics during physiological states such as sleep and wakefullness. Here, an impulse response analysis is carried out in order to anatomize the authors' geometrical results in the temporal domain. As a result, the autonomic regulation is suggested to be firmly functioning during slow wave sleep, while weakened or ...
IEEE Transactions on Biomedical Engineering, 1974
An application of the mathematical concept of curvature to the detection of distortion in arterial pressure signals is described. Curvature is defined and examples of digitally filtered pressure tracings show the relationship between curvature and the degree of damping. Even though curvature is also a function of the cardiovascular system producing the signal, the average sum of curvature can generally ...
2008 2nd International Conference on Bioinformatics and Biomedical Engineering, 2008
The cardiovascular system is complex system containing many nonlinearities. Pulse signals reflect the status of the heart and the vascular system. The chaotic properties of wrist pulse were seldom studied. Lyapunov exponents analysis can estimate the chaotic properties of the system. In this paper the wrist pulse signals of healthy group and coronary heart disease group are analyzed and studied ...
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The primary role of the cardiovascular system is to deliver a required amount of oxygen to various organs. These needs vary with time and depend on the vascular site. To maintain a required diffusion level of oxygen in the capillary networks, the cardiovascular system is controlled by regulation processes that maintain pressure and blood flow to the required physiological levels. The authors have developed a nonlinear hemodynamic model associated with a varying elastance model of the heart and four simple control processes acting on the heart rate and the vascular resistances. The computed results, showing variations of arterial mean pressure, heart rate and vascular resistances agree with the experimental data under resting conditions, during moderate exercise of 200 W and during the recuperation phase.
The authors have geometrically investigated the relationship among the state- dependent cardiovascular dynamics during physiological states such as sleep and wakefullness. Here, an impulse response analysis is carried out in order to anatomize the authors' geometrical results in the temporal domain. As a result, the autonomic regulation is suggested to be firmly functioning during slow wave sleep, while weakened or slightly unstabilized during rapid eye movement sleep. During wakefulness, although the state-dependent characteristics of impulse responses varied from subject to subject, the tendency held within a subject. These results are suggested to provide a microscopic interpretation for the geometrically obtained state-dependency of cardiovascular dynamics during sleep and wakefulness.
An application of the mathematical concept of curvature to the detection of distortion in arterial pressure signals is described. Curvature is defined and examples of digitally filtered pressure tracings show the relationship between curvature and the degree of damping. Even though curvature is also a function of the cardiovascular system producing the signal, the average sum of curvature can generally distinguish control signals from signals distorted by moderate amounts of blood or air in the catheter systems. Selected pressure signals with their associated sums of curvature show the properties and limitations of curvature for discriminating between the changes in the cardio- vascular system and distortion of pressure signals.
The cardiovascular system is complex system containing many nonlinearities. Pulse signals reflect the status of the heart and the vascular system. The chaotic properties of wrist pulse were seldom studied. Lyapunov exponents analysis can estimate the chaotic properties of the system. In this paper the wrist pulse signals of healthy group and coronary heart disease group are analyzed and studied with Lyapunov exponents analysis, and the selection of parameters is discussed. The results indicated that there was difference between two groups of wrist pulse signals, and nonlinear dynamic methods of wrist pulse analysis were helpful for non-destructive inspection of coronary heart disease.
The aim of this study was to examine how sampling rates below 1000 Hz influence the precision of heart rate variability analysis. Simulated tachograms as well as tachograms from healthy persons were investigated. With parameters from time, frequency domain and non-linear dynamics these tachograms were classified. The results were compared with theoretical assumptions and special error measures were derived. New developed measures from non-linear dynamics showed an insensitive behavior to a reduced sampling frequency down to 128 Hz. The major results of this study lead to the conclusion to use sampling rates only above 120 Hz which implies a total error in the range of approximately 1.8/spl plusmn/1.5%. However only the use of sampling rates above 200 Hz provides nearly error free results.
A computational model of the cardiovascular system is described which provides a framework for implementing and testing quantitative physiological models of heart sound generation. The lumped-parameter cardiovascular model can be solved for the hemodynamic variables on which the heart sound generation process is built. Parameters of the cardiovascular model can be adjusted to represent various normal and pathological conditions, and the acoustic consequences of those adjustments can be explored. The combined model of the physiology of cardiovascular circulation and heart sound generation has promise for application in teaching, training and algorithm development in computer-aided auscultation of the heart.
Cardiovascular system diseases are frequent cause of morbidity and mortality in Western countries. In our laboratory, early stages of ischemia - prominent diagnosis in this group - are examined by recording electrograms and action potentials by optical probe in isolated mammalian hearts loaded with voltage- sensitive dye (VSD) di-4-ANEPPS. In this study, guinea pig and rabbit isolated hearts were exposed to special protocol of s.-c. preconditioning - attenuation of the symptoms during repeated exposure to ischemic insult. In guinea pig myocardium, additive effect of VSD and ischemia triggered more serious and more frequent arrhythmias then the same situation in rabbit hearts. Moreover, expected attenuation of these effects was not observed, on the contrary to rabbit myocardium, where typical preconditioning was present. Rabbit myocardium appears to be more suitable for studies in such experimental design.
The performance of different power spectral estimation techniques including classical FFT based techniques and so called modem parametric and nonparametric methods were investigated for their sensitivity to two common practical problems in heart sound recording analysis, i.e. the noise level in the recorded signal and the uncertainty in identifying the exact start and end points of major heart sounds, S/sub 1/, S/sub 2/, and murmurs. The results of the comparison described show that no single method has superior performance with respect to all features of interest. However the EV and MUSIC eigen analysis-based techniques show a better performance in locating the dominant frequency peaks in both cases with the addition of noise and truncation in signal duration. The most dominant frequency peak DFP/sub 1/ can be evaluated by the Welch periodogram method more accurately than by other methods. However the results indicate that the Welch periodogram method does not show an acceptable performance when the signal is truncated. The results presented here indicate that in a practical situation with high level of noise and uncertainty in signal boundary, it is possible to extract the desired features and draw a conclusion about the optimum method to be used in a given situation.
Heart failure is simulated using a cardiovascular system model with embedded autonomic nervous regulation and renal blood volume adjustment. The main cardiovascular parameters under heart failure are set as reducing the left ventricular myocardial maximum elasticity by 50%, increasing sympathetic nerve activity by 20% and decreasing vagus nerve activity by 80%, increasing peripheral resistance by 60% and decreasing vascular compliance by 25%. The simulation results show that compared with normal condition, in heart failure the cardiac output (CO) reduced from 5.832 L/min to 5.767 L/min, the eject fraction (EF) reduced from 63.31% to 43.65% and left ventricular wall thickness (LVWT) increased from 10 mm to 13.70 mm. These results generally agree with physiological and pathological features of human heart failure.
Within the context of the ISO/IEEE 11073 family of standards for device communication, this standard establishes a normative definition of the communication between personal cardiovascular fitness and activity monitoring devices and managers (e.g. cell phones, personal computers, personal health appliances, set top boxes) in a manner that enables plug-and-play interoperability. It leverages appropriate portions of existing standards including ISO/IEEE 11073 ...