NDLI: Sustained vortex-like waves in normal isolated ventricular muscle.

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Sustained vortex-like waves in normal isolated ventricular muscle.

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Sustained vortex-like waves in normal isolated ventricular muscle.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Davidenko, J. M. Kent, P. F. Chialvo, D. R. Jalife, J. Michaels, D. C.
Description	Author Affiliation: Davidenko JM ( Department of Pharmacology, State University of New York Health Science Center, Syracuse 13210.);
Abstract	Sustained reentrant excitation may be initiated in small (20 x 20 x less than 0.6 mm) preparations of normal ventricular muscle. A single appropriately timed premature electrical stimulus applied perpendicularly to the wake of a propagating quasiplanar wavefront gives rise to circulation of self-sustaining excitation waves, which pivot at high frequency (5-7 Hz) around a relatively small 'phaseless' region. Such a region develops only very low amplitude depolarizations. Once initiated, most episodes of reentrant activity last indefinitely but can be interrupted by the application of an appropriately timed electrical stimulus. The entire course of the electrical activity is visualized with high temporal and spatial resolution, as well as high signal-to-noise ratio, using voltage-sensitive dyes and optical mapping. Two- and three-dimensional graphics of the fluorescence changes recorded by a 10 x 10 photodiode array from a surface of 12 x 12 mm provide sequential images (every msec) of voltage distribution during a reentrant vortex. The results suggest that two-dimensional vortex-like reentry in cardiac muscle is analogous to spiral waves in other biological and chemical excitable media.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	22
Volume Number	87
Language	English
Publisher	National Academy of Sciences
Publisher Date	1990-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Myocardial Contraction Ventricular Function Animals Electrophysiology Fluorescent Dyes In Vitro Techniques Membrane Potentials Spectrometry, Fluorescence Time Factors Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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