Journal ArticleDOI
Three-Dimensional Simulation of the Ventricular Depolarization and Repolarization Processes and Body Surface Potentials: Nornal Heart and Bundle Branch Block
TLDR
A three-dimensional computer model has been constructed to simulate the ventricular depolarization and repolarization processes in a human heart, and the resulting ECG, VCG, and BSPM's are within the expected range of clinical observations.Abstract:
A three-dimensional computer model has been constructed to simulate the ventricular depolarization and repolarization processes in a human heart. The electrocardiogram (ECG), the vectorcardiogram(VCG), and the body surface potential map (BSPM) during the QRS-T period are obtained automatically under certain heart conditions such as bundle branch block and myocardial infarctions. The ventricles, together with bundle branches and the Purkinje fibers, are composed of approximately 50 000 cell units which are arranged in a cubic close-packed structure. A different action potential waveform was assigned to each unit. The heart model is mounted in a homogeneous human torso model. Electric dipoles, which are proportional to the spatial gradient of the action potential, are generated in all the cell units. These dipoles give rise to a potential distribution on the torso surface, which is calculated by means of the boundary element method. The resulting ECG's, VCG's, and BSPM's are within the expected range of clinical observations.read more
Citations
More filters
Journal ArticleDOI
Purkinje-Muscle Reentry as a Mechanism of Polymorphic Ventricular Arrhythmias in a 3-Dimensional Model of the Ventricles
Orner Berenfeld,José Jalife +1 more
TL;DR: An anatomically appropriate computerized 3-dimensional model of the mammalian ventricles that includes the Purkinje conduction system and 214 PMJs distributed throughout the endocardium is constructed and simulation results suggest that Epicardial breakthroughs and endocardial focal activity may originate at the PMJs.
Journal ArticleDOI
On the theory of the electrocardiogram
TL;DR: The theoretical results form the basis of a computer model of the electrocardiogram that relates skin potentials to the spatial and temporal distribution of action potentials in the heart.
Journal ArticleDOI
Simulation of high-resolution QRS complex using a ventricular model with a fractal conduction system. Effects of ischemia on high-frequency QRS potentials.
TL;DR: A finite-element three-dimensional model of the ventricles with a self-similar (fractal) conduction system has been introduced as a bridge to the understanding of electrocardiographic phenomena related to high-frequency potentials and it can be concluded that these morphological changes can be attributed to a slowing of conduction velocity in the region of ischemia.
Journal ArticleDOI
Noninvasive imaging of cardiac transmembrane potentials within three-dimensional myocardium by means of a realistic geometry anisotropic heart model
Bin He,Guanglin Li,Xin Zhang +2 more
TL;DR: The present simulation results demonstrate the feasibility of noninvasive estimation of TMP distribution throughout the ventricles from body surface electrocardiographic measurements, and suggest that the present method may become a useful alternative in nonin invasive imaging of distributed cardiac electrophysiological processes within the 3-D myocardium.
Journal ArticleDOI
Modelling of the ventricular conduction system.
TL;DR: A His-Purkinje system is developed to simulate the normal activation pattern as well as abnormal activation patterns resulting from bundle branch block and bundle branch reentry in the human ventricular model.
References
More filters
Journal ArticleDOI
Total Excitation of the Isolated Human Heart
Dirk Durrer,R. Th. Van Dam,Gerrit E. Freud,Michiel J. Janse,Frits L. Meijler,R. C. Arzbaecher +5 more
TL;DR: In this paper, isolated human heart measurements were made from as many as 870 intramural terminals to obtain information concerning the time course and instantaneous distribution of the excitatory process of the normal human heart.
Journal ArticleDOI
Simulation studies of the electrocardiogram. I. The normal heart.
W T Miller,David B. Geselowitz +1 more
TL;DR: Simulated isopotential surface maps during both activation and recovery are in good agreement with data for humans reported in the literature.
Journal ArticleDOI
A Theoretic Model of the T Wave
TL;DR: A theoretical model of the T wave based on the sequence of depolarization and multiple action potentials in appropriate time phase suggests it may be useful in accounting for abnormal T waves.
Journal ArticleDOI
The sequence of normal recovery of excitability in the dog heart.
TL;DR: The sequence with which 18 to 70 ventricular sites recovered excitability after normal excitation was determined in 15 dogs and provides a tentative explanation of some features of T waves in human body surface electrocardiograms.
Journal ArticleDOI
Computer Simulation of the Propagation Process in Excitation of the Ventricles
TL;DR: A crucial role of the Purkinje network in determining the course of excitation spread was recognized in the simulated process of both normal beats and extrasystoles, and the possibility of combining the scheme with a method of reconstruction of QRS complexes by means of “transfer impedance” values was pointed out.
Related Papers (5)
Simulation studies of the electrocardiogram. I. The normal heart.
W T Miller,David B. Geselowitz +1 more