What question did this study set out to answer?

To model the distribution of electrical current through cardiac tissue during defibrillation and evaluate how different electrode configurations, patch sizes, and tissue conductivities affect defibrillation thresholds.

April 1, 1990IEEE Transactions on Biomedical Engineering

Finite element analysis of cardiac defibrillation current distributions

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Population

Two-dimensional finite element model of the canine heart and thorax (dogs)

Comparison

Various electrode configurations for the… vs Alternative electrode configurations, patch…

Design

Preclinical

Authors

NSN.G. SepulvedaMetropolitan University of Educational Sciences JWJohn P. WikswoElectrophysiology DEDebra S. EchtJon Peddie Research

Discussion

Member takes

Implication

Guides defibrillation modeling thresholds; leaves open translation to clinical human defibrillation.

Key Points

To model the distribution of electrical current through cardiac tissue during defibrillation and evaluate how different electrode configurations, patch sizes, and tissue conductivities affect defibrillation thresholds.
Constructed a two-dimensional isotropic finite element model of the canine heart and thorax.
Calibrated model voltages using in vivo defibrillation energy measurements obtained from dogs.
Evaluated isopotential contours, current lines, power distributions, and current density histograms across various electrode positions and patch sizes.
Circulating blood significantly shunts defibrillation current away from the myocardium, an effect most pronounced in two-electrode catheter configurations.
Epicardial patch size exerts a substantially greater influence on defibrillation thresholds than subcutaneous patch size.
Defibrillation success is consistent with establishing a minimum threshold current density of 35 ± 5 mA/cm² across 80 ± 5% of the cardiac tissue mass.

Structured PICO

Population

Two-dimensional finite element model of the canine heart and thorax (dogs)

Intervention

Various electrode configurations for the implantable cardioverter/defibrillator

Comparator

Alternative electrode configurations, patch sizes, and tissue conductivities

Outcome

Distribution of current through cardiac tissue during defibrillation (assessed via isopotential contours, current lines, power distributions, current density histograms, and cumulative current distributions)surrogate

A 2D finite element model of the canine heart suggests that successful defibrillation requires a current density of at least 35 mA/cm2 across approximately 80% of the myocardium.

Limitations

Two-dimensional, isotropic model
More detailed interpretation of experimental data may require the extension of the model to three dimensions

Cite This Study

Sepulveda et al. (1990) studied this question.

synapsesocial.com/papers/6a925d9869d1d35888676447 https://doi.org/10.1109/10.52342

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Finite element analysis of cardiac defibrillation current distributions

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Finite element analysis of cardiac defibrillation current distributions

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Also Consider

Also Consider