RESUMO
Dendroaspis angusticeps venom (75 micrograms/ml) caused an irreversible blockade of the directly as well as directly evoked contractions of the rat hemidiaphragm and indirectly evoked contractions of the chick biventer cervicis muscle. The venom itself also produced a contraction of the frog rectus abdominis muscle, rat fundal strip, rat uterus and nictitating membrane of the cat; however, it did alter responses of nictitating membrane to preganglionic electrical stimulation and to ganglion stimulant drugs. The effect was attributed to the presence of acetylcholine-like substance in the venom.
Assuntos
Animais , Gatos , Galinhas , Venenos Elapídicos/farmacologia , Estimulação Elétrica , Feminino , Jejuno/fisiologia , Contração Muscular/efeitos dos fármacos , Coelhos , Ranidae , Ratos , Ratos Endogâmicos , Contração Uterina/efeitos dos fármacosRESUMO
Whole venom Dendroaspis angusticeps produced a negative chronotropic and ionotropic effect on the heart. Isolation of the fraction (T39) produced the same effect. Negative inotropic effect was blocked by atropine. The bradycardia may be due to a cholinergic effect and the negative ionotropic to a direct depressant effect on the myocardium.
Assuntos
Animais , Atropina/farmacologia , Depressão Química , Venenos Elapídicos/farmacologia , Frequência Cardíaca/efeitos dos fármacos , Contração Miocárdica/efeitos dos fármacos , Coelhos , Fatores de TempoRESUMO
Lateral ventricular administration of 100 microgram of Dendroaspis polylepis venom is cats consistently produced a marked rise in arterial blood pressure, heart rate dilatation of pupils and piloerection. This intense central sympathetic discharge occurred after a latent period of 11.7 +/- 0.72 min. Bilateral adrenelectomy abolished the sympathetic discharge showing that central release of catecholamines from the adrenal medulla may play an important role in elicting the cardiovascular response.