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Sustained vortex-like waves in normal isolated ventricular muscle.

J M Davidenko1, P F Kent, D R Chialvo

  • 1Department of Pharmacology, State University of New York Health Science Center, Syracuse 13210.

Proceedings of the National Academy of Sciences of the United States of America
|November 1, 1990
PubMed
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Researchers initiated sustained reentrant excitation in cardiac muscle using electrical stimuli. This study visualizes reentrant electrical activity, revealing vortex-like patterns analogous to spiral waves in other excitable media.

Area of Science:

  • Cardiovascular Physiology
  • Cardiac Electrophysiology
  • Nonlinear Dynamics

Background:

  • Reentrant excitation is a critical mechanism underlying cardiac arrhythmias.
  • Understanding the initiation and dynamics of reentrant circuits is crucial for developing antiarrhythmic strategies.

Purpose of the Study:

  • To investigate the initiation and characteristics of sustained reentrant excitation in normal ventricular muscle preparations.
  • To visualize and analyze the spatiotemporal dynamics of reentrant electrical activity using advanced optical mapping techniques.

Main Methods:

  • Utilized small (20 x 20 x <0.6 mm) normal ventricular muscle preparations.
  • Initiated reentrant excitation with a single, precisely timed premature electrical stimulus.
  • Employed voltage-sensitive dyes and a 10x10 photodiode array for high-resolution optical mapping (1 msec temporal resolution).

Related Experiment Videos

Main Results:

  • Sustained, self-sustaining excitation waves (vortices) were successfully initiated and visualized.
  • Reentrant activity pivoted around a small, low-amplitude depolarization (phaseless) region at high frequencies (5-7 Hz).
  • Episodes of reentrant activity were long-lasting but could be terminated by electrical stimulation.

Conclusions:

  • Two-dimensional vortex-like reentry can be initiated and sustained in cardiac muscle.
  • The observed reentrant patterns are analogous to spiral waves found in other excitable media.
  • Optical mapping provides a powerful tool for studying complex cardiac electrical phenomena.