[Relation between intracardiac reflex effects on the rate of atrioventricular conduction and parameters of neural pathway stimulation].
Intracardiac nerves of the frog isolated heart were cut and the central or the peripheral end was stimulated. The atrioventricular (a-v) conduction was measured. The data showed that the intracardiac parasympathetic nervous system could induce both acceleration and deceleration of the a-v conduction, depending on the parameters of stimulation. Atropine blocked both the positive and the negative dromotropic effects whereas beta-adrenoblocking agent inderal was ineffective. The possible mechanism of the dromotropic effects observed are discussed.
D000818:Animals; D001001:Anura; D001285:Atropine / Q000494:pharmacology; D004562:Electrocardiography; D006321:Heart / Q000294:innervation*; D006329:Heart Conduction System / Q000502:physiology*; D066298:In Vitro Techniques; D010275:Parasympathetic Nervous System / Q000502:physiology*; D011433:Propranolol / Q000494:pharmacology; D012018:Reflex / Q000502:physiology*
D001285:Atropine; D011433:Propranolol
Zavisimost' vnutriserdechnykh reflektornykh vliianiĭ na skorost' atrioventrikuliarnogo provedeniia ot parametrov stimuliatsii nervnykh puteĭ.