[Mechanisms of differences of the cycle length of excitation spiral waves in atrial and ventricular tissues].
Ectopic spiral wave sources--reverberators--were produced in pieces of rabbit atrium and ventricle by an induction of a single properly timed premature impulse. It was found that the cycle length (T) of the ectopic source gradually increased immediately after its appearance in atrial and changed a little bit after its appearance in ventricular tissue. Relationship between changes of T and refractorines of the heart tissues was investigated. The model is proposed which explains these changes of T by the cycle length dependence on the value of fast inward sodium current.
D000818:Animals; D016275:Atrial Function; D004553:Electric Conductivity; D004558:Electric Stimulation; D006321:Heart / Q000502:physiology*; D007700:Kinetics; D009928:Organ Specificity; D011817:Rabbits; D016276:Ventricular Function
Issledovanie mekhanizma razlichnogo povedeniia perioda spiral'nykh voln vozbuzhdeniia v predserdii i zheludochke.