[Mechanical oscillations in the pathologically altered myocardium].

In pathologically altered myocardium (auricles) of patients with acquired heart diseases, there have been found mechanical oscillations of the tone which occurred after basic contracture induced by electrical stimulation. The oscillations were recorded at a normal ionic composition of Tyrode solution and a temperature of 32-34 degrees C. No mechanical oscillations were normally observed in the myocardium of patients with congenital heart diseases. It was shown that oscillations might affect the time course of the frequency-power curves.