[Analysis of the structure of cardiac rhythm in atrial flutter].

Heart rhythm was studied by computer in 67 patients with atrial flutter of different etiology. It was discovered that respiratory activity has an influence on the conduction of atrial flutter waves to the ventricles. In the majority of cases, the conduction of atrial waves to the ventricles is multiple with a constant conduction ratio. However, in some cases the conduction of atrial flutter waves via the atrioventricular system occurs according to the Samoilov-Wenckebach periodicals. In the latter case and in atrial flutter with a conduction ratio of 4:1, one-third of patients manifest, after the recovery of the sinus rhythm, atrioventricular blockade, grade 1.