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• W2808028819 startingPage "236" @default.
• W2808028819 abstract "In this work, we analyze the way concentric hypertrophy, triggered by mild aortic stenosis, affects the electromechanical activity of the left ventricle during a cardiac cycle by employing a 3D finite-element strongly-coupled model. Three mechanical feedbacks on electrophysiology are considered: the conduction feedback, acting on conductivity tensors, the convection feedback, dependent on the deformation rate, and the mechanoelectric feedback due to stretch-activated membrane channels. In case of a multiple endocardial electrical stimulation for a healthy ventricle, the convection feedback raises the values of action potential duration APD while modifying the corresponding distribution patterns, mainly in the latest activated regions. Hypertrophy stresses the latter effect. If an endocardial ectopic stimulation is applied to the healthy ventricle, the convection feedback enhances its effects on APD (by increasing the corresponding dispersion too), especially on the opposite side with respect to the stimulation site; the mechanoelectric feedback reduces APD values on the midmyocardium instead. By including all feedbacks, it turns out that the hypertrophic ventricle exhibits lower values and a modified epicardial pattern of APD if compared with the healthy and stenotic (without growth) ventricles, but its transmural dispersion of repolarization does not increase and its epicardial electrograms have the same morphological features. Despite a decrease of the end-diastolic volume, hypertrophy compensates for the stenotic increase of the end-systolic volume and of the internal pressure during the efflux phase, while normalizing stroke work." @default.
• W2808028819 created "2018-06-21" @default.
• W2808028819 creator A5006394600 @default.
• W2808028819 creator A5028302493 @default.
• W2808028819 creator A5053408507 @default.
• W2808028819 creator A5074285976 @default.
• W2808028819 date "2018-08-01" @default.
• W2808028819 modified "2023-09-26" @default.
• W2808028819 title "Electromechanical effects of concentric hypertrophy on the left ventricle: A simulation study" @default.
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