What question did this study set out to answer?

To examine in vivo ventricular fibrillation for the presence of deterministic linear and nonlinear dynamical structures.

Evidence for Determinism in Ventricular Fibrillation

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Population

In vivo ventricular fibrillation model

Design

Preclinical

Authors

Animal VF data extend chaos control concepts; human translation remains hypothesis-generating pending prospective trials.

To examine in vivo ventricular fibrillation for the presence of deterministic linear and nonlinear dynamical structures.
Applied a recently formulated technique to estimate cardiac transmembrane currents in vivo.
Assessed underlying electrical dynamics using unstable fixed point analysis and a novel measure of nonlinear determinism.
Unstable fixed point analysis detected deterministic dynamical structure within in vivo ventricular fibrillation.
A novel measure of nonlinear determinism confirmed the presence of deterministic behavior comparable to dynamics targeted in chaos control.

Population

In vivo ventricular fibrillation model

Intervention

Unstable fixed point analysis and a newly formulated measure of nonlinear determinism

Outcome

Evidence of deterministic linear and nonlinear structure in ventricular fibrillation

Ventricular fibrillation exhibits deterministic dynamics in vivo, suggesting potential applications for chaos control techniques.

Witkowski et al. (1995) studied this question.

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