Extracardiac effects of myocardial electrical anisotropy

Taccardi, Bruno; Punske, Bonnie B.; MacLeod, Robert S.; Ni, Quan

doi:10.1515/bmte.2001.46.s2.216

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…For example, Plonsey and Barr assume equal directional anisotropy ratios for both their electrode scenarios [17,20] in order to be able to find analytical expressions for the potentials, even though they admit that there are doubts about the validity of this [17,14,20]. Various experimental and modelling studies [34,35,36,37,38,6,7] have shown that it is necessary to use unequal anisotropy ratios to produce meaningful and realistic potential distributions on the epicardium and in the thorax.…”

Section: Discussionmentioning

confidence: 99%

A new approach to the determination of cardiac potential distributions: Application to the analysis of electrode configurations

Johnston

Kilpatrick

2006

Mathematical Biosciences

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This paper presents a mathematical model and new solution technique for studying the electric potential in a slab of cardiac tissue. The model is based on the bidomain representation of cardiac tissue and also allows for the effects of fibre rotation between the epicardium and the endocardium. A detailed solution method, based on Fourier Series and a simple one-dimensional finite difference scheme, for the governing equations for electric potential in the tissue and the blood, is also presented. This method has the advantage that the potential can be calculated only at points where it is required, such as the measuring electrodes. The model is then used to study various electrode configurations which have been proposed to determine cardiac tissue conductivity parameters. Three electrode configurations are analysed in terms of electrode spacing, placement position and the effect of including fibre rotation: the usual surface four-electrode configuration; a single vertical analogue of this and a two probe configuration, which has the current electrodes on one probe and the measuring electrodes on the other, a fixed distance away. It is found that including fibre rotation has no effect on the potentials measured in the first two cases; however, in the two probe case, non-zero fibre rotation causes a significant drop in the voltage measured. This leads to the conclusion that it is necessary to include the effects of fibre rotation in any model which involves the use of multiple plunge electrodes.

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Section: Discussionmentioning

confidence: 99%

A new approach to the determination of cardiac potential distributions: Application to the analysis of electrode configurations

Johnston

Kilpatrick

2006

Mathematical Biosciences

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“…Examples come from electrophysiology of the heart [129][130][131][132][133][134][135][136][137] and nervous system [138][139][140] and many others in which scientists and engineers deal with high spatial and temporal resolution of their measured or simulated data. The challenges of this form of visualization include representing both geometric shape and the associated data in a manner that is clear to the user, establishing quantitative, flexible coding and scaling of the data for detailed interactive analysis, and preserving efficiency so that a user may sort through very large (tens to hundreds of MBytes) data sets.…”

Section: Map3dmentioning

confidence: 99%