Ventricular fibrillation studied by the microelectrode method.

Capillary ultrainicroeleetrodes were inserted into ventriculaimuscle fibers of dogs in ventricular fibrillation nnd action potentials obtained were compared with deflection.? of unipolar direct lead, adjoining; bipolar direct lead or other electrocardiograms taken simultaneously. In most stages of ventricular fibrillation neither synchronism nor any other regular time relationship could be found between them. Microelectrodes inserted at two points varionsly distant on various regions of the ventricular surface also failed to show any regular time relationship. Total incoordination of ventricular muscle fibers was thus supported.