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Vortex action potentials in normal ventricular muscle.
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721.
Annals of the New York Academy of Sciences
|January 1, 1990
Summary
Healthy heart tissue can develop electrical instabilities like vortices, potentially causing arrhythmias and sudden cardiac death. Understanding these mechanisms may improve treatments for ventricular tachycardia and fibrillation.
Area of Science:
- Cardiovascular Electrophysiology
- Computational Biology
Background:
- Ventricular myocardium exhibits complex electrical behavior despite structural nonuniformities.
- Excitable media can support self-sustaining wave phenomena like vortices.
Purpose of the Study:
- To investigate the electrical behavior of healthy ventricular myocardium.
- To explore the role of vortices in cardiac arrhythmias.
Main Methods:
- High-resolution electrical mapping of ventricular myocardium.
- Electrical stimulation during the vulnerable period.
Main Results:
- Healthy myocardium behaves like a uniformly anisotropic excitable medium.
- Periodic vortex activity can be evoked by specific electrical stimuli.
- Tissue discontinuities and heterogeneity increase vulnerability.
Conclusions:
- Vortices may underlie reentrant tachycardias and ventricular fibrillation.
- Understanding these mechanisms can inform improved arrhythmia management strategies.