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In experiments on cats a single premature beat or vagal stimulation shortened the effective refractory period without any spontaneous heart rate disturbances, while the combined action of these factors always led to paroxysmal tachycardia or atrial fibrillation. It is suggested that contracting myocardium possesses a covert ability for self-excitation(More)
A method of controlled atrial fibrillation modelling including the paired stimulation of the right atrium induced by using a transvenous bipolar catheter during vagal arrest of the heart is presented. The myocardial fibrillation is supposed to result from a critical shortening of the absolute refractory period with relation to the hypothetic period of(More)
In acute experiments, synchronization of cardiac and vagal rhythms was achieved during burst stimulation of a vagus nerve. The study of atrial excitability in the synchronization revealed changes of diastolic threshold, effective and total refractory periods, the changes being unrelated to the synchronization phenomenon and due to variation of the heart(More)