2 edition of cellular automaton model of ventricular fibrillation. found in the catalog.
cellular automaton model of ventricular fibrillation.
Alan Howard Bailey
Thesis (D. Phil.)- University of Ulster, 1988.
Ventricular fibrillation (often shortened to VF or V-Fib) is a type of arrhythmia of the heart. "Arrhythmia" means the heart is not beating normally. What is Ventricular Fibrillation? When a person is in ventricular fibrillation, the heart does not beat in any kind of pattern. Instead, it quivers and twitches very esDB: The ECG criteria to diagnose ventricular fibrillation (vfib) on a lead ECG is discussed including a brief discussion of treatment using automated external defibrillators (AED) and ICDs.
Ventricular fibrillation or ventricular tachycardia on ECG Pearls Recommended Exam: Mental Status If no IV, drugs that can be given down ET tube should have dose doubled and then flushed with 5 ml of Normal Saline. IV/IO is the preferred route when Size: 87KB. Cellular automata style quantitative computing. Cellular automata were first introduced by John von Neumann and Stanislaw Ulam in the s, and gradually used to solve a wide range of problems, including multicellular biological modeling in which a natural correspondence between each automaton cell and each biological cell is assumed [18–21]. Cited by:
Ventricular fibrillation is an extremely rapid heart rhythm occurring in the lower heart chambers, usually at over beats per minute. In addition to being so very rapid, the electrical activation of the ventricles does not display a specific and repetitive pattern. Despite the importance of this arrhythmia, little is known about the cellular metabolism of the heart when it is subjected to ventricular fibrillation. The Journal of Cardiovascular Diseases & Diagnosis is an academic journal – hosted by OMICS International – a pioneer in open access publishing–and is listed among the top 10 journals in.
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Cellular Automaton Ventricular Fibrillation Cardiac Arrhythmia Antiarrhythmic Drug Refractory Period These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm by: 1.
Abstract. The application of cellular automata models of cardiac conduction (CAMCC) to cardiac arrhythmias is examined. We define the relation between simple two- and three-state CAMCC and contrast them with models of continuous by: In the present study, we propose a method using an extended, quantitative cellular automaton to build a discrete whole heart model with the data of the Visible Human Project (VHP) male cadaver.
An ECG simulation algorithm based on the membrane potential of each and every cell is designed and validated in a 2-D model built with the same by: Frank J. Dowd, in xPharm: The Comprehensive Pharmacology Reference, Epidemiology. Ventricular fibrillation is the most common cause of sudden death.
Its occurrence is a direct reflection of underlying causes, especially ischemic heart disease Those who have the first ventricular fibrillation event soon after myocardial infarction (within hours) have a lower risk of a subsequent. Ventricular fibrillation (V-fib or VF) is an abnormal heart rhythm in which the ventricles of the heart quiver instead of pumping normally.
It is due to disorganized electrical activity. Ventricular fibrillation results in cardiac arrest with loss of consciousness and no pulse. This is followed by death in the absence of treatment. Ventricular fibrillation is initially found in about 10% of Diagnostic method: Electrocardiogram.
The pathophysiology of AF is complex and incompletely understood to date. 1,2 AF is a progressive disease of the atria involving cellular automaton model of ventricular fibrillation. book multitude of mechanisms related to its initiation, maintenance and progression.
Experimental evidence suggest that AF is characterised by alternations in atrial size, shape electrophysiology, autonomic innervation, and cardiomyocyte metabolism, as well as Author: Konstantinos N Aronis, Rheeda L Ali, Jialiu A Liang, Shijie Zhou, Natalia A Trayanova.
The Greenberg–Hastings cellular automaton (GHCA) is a probabilistic two-dimensional cellular automaton with a Moore or von Neumann neighborhood to mimic pattern formations of excitable media. A Cellular Automaton Model of Electrical Activation in Canine Ventricles: A Validation Study Prasad B.
Gharpure and Christopher R. Johnson UUSCI Scientiﬁc Computing and Imaging Institute University of Utah Salt Lake City, UT USA Abstract: An anatomically accurate 3-D cellular automaton model was used for studying.
Ventricular fibrillation (VF) is notorious as one of the most common causes of SCD, but knowledge about VF׳s underlying mechanisms remains incomplete. It is generally considered that there are two major but contradictory hypotheses on the mechanisms of VF: the multiple-wavelet and mother-rotor by: 5.
A Lattice-Gas Cellular Automaton Model for Discrete Excitable Media. Spirals and Vortices, SIAM Journal on Applied MathematicsEstimating the Ventricular Fibrillation Threshold. Theory of Heart, Cited by: CELLULAR EFFECTS OF DEFIBRILLATING SHOCKS.
To date, the exact mechanisms behind electrical defibrillation remain incompletely understood. It is thought that shocks defibrillate by altering the potential difference across the cell membrane (that is, the transmembrane potential). 1 However, the situation in the heart is extremely complex with the intracellular space and extracellular space both Cited by: A Cellular Automata is a type of model that can be used to model cardiac action potential propagation.
One of the advantages of this approach against the methods based on differential equations is. Ventricular fibrillation (also referred to as VF or v-fib) is a fatal cardiac rhythm that occurs when the lower chambers of the heart (ventricles) lose the ability to contract and circulate blood to the rest of the body.
V-fib results in an ineffective, erratic heartbeat as blood stops flowing through the body and essential organs experience a dangerous loss of blood supply. Ventricular fibrillation is the most common mechanism of sudden unexpected cardiac death in persons with asymptomatic or symptomatic coronary artery disease.
The electrophysiologic mechanisms reviewed in this article include: automaticity of pacemaker fibers, transformation of nonpacemaker into pacemaker fibers, “injury” currents and reentry.
Some of the conditions facilitating ventricular. Ventricular fibrillation, a type of arrhythmia (abnormal heart rhythm) characterized by the irregular and uncoordinated contraction of the muscle fibres of the ventricles, the lower chambers of the ventricular fibrillation completely prevents the heart from functioning as a pump, it quickly brings death unless emergency measures restore the circulation of oxygenated blood.
Spiral breakup in an anatomical model of the ventricles of the heart is also studied. The patterns of excitation in the heart are presented at different wavelengths together with their electrocardiograms. Finally it is suggested that the phenomenon of spiral breakup is a Cited by: In ventricular fibrillation, the heart’s ventricles contract in a rapid and chaotic manner.
As a result, little or no blood is pumped from the heart. Unless emergency medical help is provided immediately, ventricular fibrillation will lead to cardiovascular collapse and sudden death. Ventricular Fibrillation Definition Ventricular fibrillation is a very rapid, uncoordinated, ineffective series of contractions throughout the lower chambers of the heart.
Unless stopped, these chaotic impulses are fatal. Source for information on Ventricular Fibrillation: Gale Encyclopedia of Medicine, 3rd ed. dictionary. In ventricular fibrillation, the ventricles merely quiver and do not contract in a coordinated way.
No blood is pumped from the heart, so ventricular fibrillation is a. the development and analysis of a ventricular fibrillation detector by scott david greenwald b.s.e., duke university () submitted in partial fulfillment of the requirements for the degree of master of science in electrical engineering and computer science at the massachusetts institute of.
Ventricular fibrillation (v-fib for short) is the most serious cardiac rhythm disturbance. The lower chambers quiver and the heart can't pump any blood, causing cardiac arrest. Causes: of. where c CA and D CA are the plane wave speeds and diffusion coefficients for the cellular automata model, and c 0 and D FHN are plane wave speeds and diffusion coefficients for the FHN model.
For r=9, θ= and Δx=, we can determine that D CA = This value is less than an estimate obtained from Eq. (7) for the same parameters [see Fig. 3(b), D=17].The discrepancy is caused by the Cited by: Ventricular fibrillation is a heart rhythm problem characterized by rapid and erratic electrical impulses.
As a result, the heart’s ventricles (pumping chambers) quiver in vain instead of.