ELETROFISIOLOGIA CARDIACA PDF

Causas cardacas: hipertenso, pericardites, miocardites, doena isqumica Causas no cardacas: alcoolismo, hipertireoidismo, diabetes Conceitos de Pr-carga e Pscarga A frao de ejeo sofre influncia das chamadas pr-carga e pscarga. Como pr e ps-carga entende-se como adificuldade de ejeo do sangue enfrentada pelo ventrculo. Pr-cargaest relacionada ao momentoantes da ejeo Ps-cargaao momentodurante a ejeo. A pr-carga pode ser medida como o volume diastlico final, ou seja, quanto maior o enchimento, maior ser a quantidade de sangue ejetado, ou seja, a pr-carga ser aumentada.

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The use of uniform meshes leads to a high computational cost, as it requires a large number of mesh points. Wagner Meira Junior Co-orientador: The bundle of His divides into right and left pathways to provide electrical stimulation to both ventricles. A small portion of the last part of the PR interval is represented by the conduction time through the bundle of His.

An arrhythmia may occur when: A small portion of the last part of the PR interval is represented by the conduction time through the bundle branches. Arritmiaonline Portal de Eletrofisiologia Resumo em lingue estrangeira: Show full item record. The AV node slows impulse conduction, which allows time for the atria to contract and for blood to be pumped from the atria to the ventricles prior to ventricular contraction.

Just below the AV node, the impulse passes through the bundle of His. Located between the Atrium and the Ventricles in the interatrial septum close to the tricuspid valve Receives the impulse from the SA Node and delivers it through the Bundle of His the forefront of the His-Purkinje network Produces rates at BPM if the SA Node fails to fire Conduction through the AV Node is slow, allowing appropriate fill time for the ventricles prior to ventricular contraction.

In this work we propose, implement and combine strategies using parallel computing and graphical processing unit GPUadaptive meshes in space and time adaptive methods in order to reduce the execution time of cardiac electrophysiology simulations. Usually, the numerical solution of the partial differential equations that model the phenomenon requires fine enough space discretizations to follow the wave front, which is about 0.

Although we achieved a significant improvement in the execution time of the cardiac electrophysiology simulations, we are far from real-time simulations. Computational models have become valuable tools for the study of the electrical behavior of the heart.

Enviado por Maria Eduarda flag Denunciar. If the normal conduction pathway is interrupted,another part of the heart takes over as pacemaker. Rafael Sachetto Oliveira Orientador: Furthermore, the combination of adaptive meshes techniques together with numerical methods with adaptive time step and parallel computing using both multicore computers and GPUs proved extremely effective achieving speedups larger than x using only one machine equipped eletrfoisiologia eight cores and a GPU.

This takes place slowly, and generates a wide wave. The use of ALG adaptive mesh also proved very attractive because the electrical wavefront that propagates corresponds only to a small fraction of the cardiac tissue. For more information visit http: In this sense, the tests reported in this work show that the bi-dimensional heart tissue model simulations were accelerated up to 20 times by using the adaptive mesh algorithm, with no loss in accuracy of numerical solution obtained. The septal fascicles of the Left Bundle Branch cause the first wave of ventricular depolarization, in a left-to-right direction across the septum, creating a Q-wave in leads I and II, and an R-wave in lead III.

The atrial depolarization wavefront, represented by the P-wave on the ECG, spreads initially downward in the right atrium, and ends as a primarily leftward vector in the left atrium. Each contraction represents one heartbeat.

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Aula - Eletrofisiologia Cardíaca e Ciclo Cardíaco

The use of uniform meshes leads to a high computational cost, as it requires a large number of mesh points. Wagner Meira Junior Co-orientador: The bundle of His divides into right and left pathways to provide electrical stimulation to both ventricles. A small portion of the last part of the PR interval is represented by the conduction time through the bundle of His. An arrhythmia may occur when: A small portion of the last part of the PR interval is represented by the conduction time through the bundle branches. Arritmiaonline Portal de Eletrofisiologia Resumo em lingue estrangeira: Show full item record.

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Eletrofisiologia

Tygonos Hi, Why this article is not access for allI really need the method but unfortunately I can not use it. Optical Mapping of Langendorff-perfused Rat Hearts. Conduction accelerates through the His Bundle into the bundle branches. The septal fascicles of the Left Bundle Branch cause the first wave of ventricular depolarization, in a left-to-right direction across the septum, creating a Q-wave in leads I and Eletrofisiologoa, and an R-wave in lead III.

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Elettrofisiologia

An unexpected error occurred. Unable to load video. Programmed Electrical Stimulation in Mice Protocol Translated to Portuguese A small portion of the last part of the PR interval is represented by the conduction time through the bundle branches. The objective of this work is to propose a study model for the evaluation of the interference of 2,6-diisopropylphenol in cardiac electrophysiological variables and to analyze the effects of propofol on arrhythmias that conceptually have as a mechanism the activities triggered by late post-potentials. Propofol is an effective hypnotic agent for the induction and maintenance of anesthesia. Figura modificado a partir Mathur et al.

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ELETROFISIOLOGIA CARDIACA PDF

Conduction time through the AV node accounts for most of the duration of the PR interval. Cardiac electrophysiology — Wikidata The bundle of His divides into right and left pathways to provide electrical stimulation to both ventricles. Rodrigo Weber dos Santos Banca: For more information eketrofisiologia http: An arrhythmia may occur when: The AV node slows impulse conduction, which allows time for the atria to contract and for blood to be pumped from the atria to the ventricles prior to ventricular contraction. The use of ALG adaptive mesh also proved very attractive because the electrical wavefront that propagates corresponds only to a small fraction of the cardiac tissue. The OpenGL approach showed to be the fastest with a speedup of compared to the multicore implementation for the solution of the nonlinear system of ordinary differential equations ODEs associated to the solution of the cardiac model, whereas CUDA was the fastest elertofisiologia the numerical solution of the parabolic partial differential equation with a speedup of 8. Although we achieved a significant improvement in the execution time of the cardiac electrophysiology simulations, we are far from real-time simulations.

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