Abstract
Although external cardiac defibrillation is generally recognized to be highly effective, repeated discharges of submaximal or maximal energy may lead to marked disturbances of myocardial contraction and relaxation [2-4], postcardioversion arrhythmias (including fibrillation) [1,9-11], and electromechanical dissociation and/or asystole [2,10], as well as to serious morphological lesions in the myocard ium, including infarction [8,10]. The quoted studies, however, are mainly concerned with monophasic defibrillation waveforms widely used in the West, whereas more effective, but less well studied, biphasic waveforms are used in countries of the former USSR. In the present study, functional damage caused to the heart by monophasic waveforms (Edmark pulses) were compared to those caused by asymmetrical quasisinusoidal biphasic waveforms (Gurvitch pulses).
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