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Heart failure constitutes a major public health problem worldwide. The electrophysiological remodeling of failing hearts sets the stage for malignant arrhythmias, in which the role of the late Na(+) current (I(NaL)) is relevant and is currently under investigation. In this study we examined the role of I(NaL) in the electrophysiological phenotype of(More)
BACKGROUND Heart failure is a final common pathway or descriptor for various cardiac pathologies. It is associated with sudden cardiac death, which is frequently caused by ventricular arrhythmias. Electrophysiological remodeling, intercellular uncoupling, fibrosis and autonomic imbalance have been identified as major arrhythmogenic factors in heart failure(More)
The use of antiarrhythmic drugs is common to treat heart rhythm disorders. Computational modeling and simulation are promising tools that could be used to investigate the effects of specific drugs on cardiac electrophysiology. In this paper, we study the multiscale effects of dofetilide, a drug that blocks IKr, from cellular to organ level paying special(More)
Dofetilide is a class-III drug that inhibits the rapid component of the delayed potassium current ( I(Kr)). Experimental studies have shown that the different layers of ventricular muscle present differences in action potential duration (APD) and different responses to class III agents. It has been suggested that it contributes to APD heterogeneity in the(More)
Simulation of action potential propagation on cardiac tissues represents both a computational and memory intensive task. The use of detailed ionic cellular models, combined with its application into three-dimensional geometries turn simulation into a problem only affordable, in reasonable time, with High Performance Computing techniques. This paper presents(More)
This paper combines high-performance computing and grid computing technologies to accelerate multiple executions of a biomedical application that simulates the action potential propagation on cardiac tissues. First, a parallelization strategy was employed to accelerate the execution of simulations on a cluster of personal computers (PCs). Then, grid(More)
Action potential (AP) changes occurring in ischemic myocytes predispose the myocardium to fibrillation and sudden death. Ischemia is a critical and unstable condition, so experiments are difficult to conduct at the cellular level in human. The aim of this work is to use computational models to investigate the dynamic changes in human ischemic myocardium at(More)