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[The role of the interatrial septum in development of supraventricular tachyarrhythmias of vagal origin in dogs].

Patterns of atrial activation of ectopic pulse source during vagal stimulation were studied on atrial epicardial surface and atrial septum in mongrel dogs. Epicardial activation maps were drafted. The findings show that, irrespective of preferred direction of conduction in the atria and septum, the entire atrial myocardium acted as a conducting system. Mapping of the first extrasystolic beats during tachyarrhythmias induced with vagal stimulation, has shown their ectopic origin. The data obtained confirms the suggestion that atrial fibrillation may be due to a single source of arrhythmia in septal area.