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Now showing items 6281-6290 of 6329
Imagerie pondérée en diffusion dans la narcolepsie et l’hypersomnie idiopathique
(2024-02-19)
Introduction : Les analyses de connectivité cérébrale dans les trois troubles majeurs d'hypersomnolence centrale, la narcolepsie de type I (NT1), de type II (NT2) et de l’hypersomnie idiopathique (HI) sont rares dans la ...
Simulation du remodelage structurel des oreillettes : dissociation endo-épicardique, optimisation multi-paramètre des conductivités et morphologie des potentiels extracellulaires
(2022-05-12)
La fibrillation auriculaire (FA) est le type d’arythmie cardiaque le plus fréquent. Cependant, ses mécanismes sont encore mal compris et le développement de stratégies thérapeutiques efficaces reste un défi. Des recherches ...
Picture description of the Western aphasia battery picnic scene : reference data for the French Canadian population
(American Speech-Language-Hearing Association, 2021-11-04)
Purpose: The main aim of this study is to provide French Canadian reference data for quantitative measures extracted from connected speech samples elicited by the Western Aphasia Battery–Revised picnic scene, a discourse ...
Simulation of atrial fibrillation in a non-ohmic propagation model with dynamic gap junctions
(American Institute of Physics, 2022-04-11)
Gap junctions exhibit nonlinear electrical properties that have been hypothesized to be relevant to arrhythmogenicity in a structurally remodeled tissue. Large-scale implementation of gap junction dynamics in 3D propagation ...
Time resolution for wavefront and phase singularity tracking using activation maps in cardiac propagation models
(American Institute of Physics, 2020-03-19)
The dynamics of cardiac fibrillation can be described by the number, the trajectory, the stability, and the lifespan of phase singularities (PSs). Accurate PS tracking is straightforward in simple uniform tissues but becomes ...
Estimation of the QT-RR relation : trade-off between goodness-of-fit and extrapolation accuracy
(IOP Publishing, 2017-02-03)
Correction of the QT interval in the ECG for changes in heart rate (RR interval) is needed to compare groups of patients and assess the risk of sudden cardiac death. The QTc represents the QT interval at 60 bpm, although ...
Multiparameter optimization of nonuniform passive diffusion properties for creating coarse-grained equivalent models of cardiac propagation
(Elsevier, 2021-09-10)
The arrhythmogenic role of discrete cardiac propagation may be assessed by comparing discrete
(fine-grained) and equivalent continuous (coarse-grained) models. We aim to develop an optimization algorithm for estimating ...
Theoretical and experimental comparison of lag-based and time-based exponential moving average models of QT hysteresis
(IOP Publishing, 2017-09-26)
Objective: In the electrocardiogram, adaptation of the QT interval to variations in heart rate is not instantaneous. Quantification of this hysteresis phenomenon relies on mathematical models describing the relation between ...
A statistical model of false negative and false positive detection of phase singularities
(American Institute of Physics, 2017-10-26)
The complexity of cardiac fibrillation dynamics can be assessed by analyzing the distribution of phase singularities (PSs) observed using mapping systems. Interelectrode distance, however, limits the accuracy of PS detection. ...
Visualization of interpolated atrial fiber orientation using evenly-spaced streamlines
(Elsevier, 2019-07-08)
Background
Mathematical models of electrical propagation in the atria necessitate the specification of fiber orientation, often visualized over the epicardial and endocardial surfaces. Clear graphical representation of ...