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Electrophysiologic Observations Concerning the Genesis of Ventricular Fibrillation.

L. S. Dreifus, M.D., F.A.C.P.; Y. Watanabe, M.D.; V. Satinsky, M.D.; and W. Likoff, M.D., F.A.C.P.
Ann Intern Med. 1963;58(4):712. doi:10.7326/0003-4819-58-4-712_1
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This excerpt has been provided in the absence of an abstract.

A satisfactory theory of ventricular fibrillation must explain; (1) initiation of a premature systole and a series of re-entrant waves, and (2) the factors engendering their transformation into fibrillation.

Ten dogs were placed under hypothermia with the aid of cardiopulmonary bypass. Transmembrane potentials, utilizing 2 microelectrodes, and a surface electrogram were recorded simultaneously. Ventricular fibrillation was produced spontaneously by focal heating. Continuous recordings during the transition from a normal action potential to fibrillation potentials showed the following sequence of events: 1. Fibrillation is preceded by one or more ventricular premature systoles with a slow rate of depolarization and incomplete propagation.


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