[Atrial fibrillation process studied in clinical practice by using statistical analysis methods]

The results of studying the electrical activity of the atria in 53 patients with cardiac fibrillation by means of a special digital computer system are discussed. On the strength of the aggregate of amplitude, rate, and morphological characteristics, three varieties of fibrillation waves are distinguished. It is shown that in the absence of cardiotropic therapy, the principal regular features in the distribution of the ff waves according to the frequency ranges are preserved in one and the same patients for a long period of time. A characteristic dynamics of changes in atrial activity during treatment with preparations of digitalis was disclosed, which may be an additional criterion of digitalization. A connection was revealed between the changes in atrial activity during treatment with digitalis preparations and the characteristic dynamics of the ventricular rhythm structure. The absence of such correlative connection may be evidence of the possible occurrence of atrioventricular block after restoration of the sinus rhythm.