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4.
Biull Eksp Biol Med ; 105(3): 298-300, 1988 Mar.
Artigo em Russo | MEDLINE | ID: mdl-3258168

RESUMO

The influence of ethacizin (a diethylamine analog of ethmozine) (1.10(-7)-1.10(-6) g/ml) upon the phase-dependent chronotropic parasympathetic effects was studied on the perfused frog heart. The vagolytic influence of ethacizin (5.10(-7) and 1.10(-6) g/ml) was detected; the concentration of 1.10(-7) g/ml was found ineffective. The vagolytic effect consisted of a decreased maximum of phase-dependent effect, reduced latency and time required for the manifestation of the maximum increase. The period of inhibitory vagal stimulus effectiveness did not change significantly.


Assuntos
Antiarrítmicos/farmacologia , Frequência Cardíaca/efeitos dos fármacos , Moricizina/análogos & derivados , Sistema Nervoso Parassimpático/efeitos dos fármacos , Fenotiazinas/farmacologia , Animais , Depressão Química , Relação Dose-Resposta a Droga , Técnicas In Vitro , Rana temporaria , Tempo de Reação/efeitos dos fármacos , Fatores de Tempo
5.
Zh Evol Biokhim Fiziol ; 23(6): 737-42, 1987.
Artigo em Russo | MEDLINE | ID: mdl-3501923

RESUMO

In experiments on the heart of the cod Gadus morhua and frog Rana temporaria in situ, studies have been made of changes in the heart rate induced by stimulation of the vagal nerve by single brief bursts delivered at various intervals after P wave of the ECG. Certain differences were found in changes of the heart rate between these animals. In the cod, maximum chronotropic effect was equal to 65% of the duration of initial cardiac cycle, the latency of this effect being equal to 290 ms; in the frog, corresponding figures were 12-13% and approximately 940 ms. The duration of negative chronotropic effect in the heart of the cod was equal to 700 ms, that of the frog--to 2.700 ms. Functional role of these differences is discussed in relation to the problem of the development of parasympathetic regulation of the heart rate in phylogenesis of vertebrates.


Assuntos
Peixes/fisiologia , Coração/fisiologia , Rana temporaria/fisiologia , Nervo Vago/fisiologia , Animais , Estimulação Elétrica , Eletrocardiografia , Filogenia
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