[Effect of preliminary stimulation on the repetitive firing of rabbit papillary muscle fibers].

It has been shown that the preliminary stimulation inhibits the initiation of repetitive firings (RF), increases the threshold current of RF and decreases membrane depolarization, induced by the action of constant current. It has been shown, that the higher the stimulation frequency, the higher the threshold current of RF and the lower the level of depolarization. It has been established that the time necessary for the restitution of the control firings of the tissue to the constant current after the action of the high-frequency stimulation does not exceed 2 minutes. It has been shown that the behavior of membrane potential under the constant current is characterized by two particularities: a) dissociation of the first response to switching on the constant current' b) a strong decay of the membrane potential to the resting potential.