Differences between the prejunctional effects of phenylephrine and clonidine in guinea-pig isolated atria
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چکیده
منابع مشابه
Effect of Sodium Valproate on Ouabain-Induced Arrhythmia in Isolated Guinea-Pig Atria
Sodium valproate (SV), an antiepileptic drug has several mechanism of action. It inhibits voltage sensitive Na+ channels and reduces intracellular Na accumulation. These actions are similar to that of both phenytoin and carbamazepine. We have investigated the direct cardiac action of SV and its effects on ouabain-induced arrhythmia in isolated guinea-pig atria. The guinea-pig atrium was dissect...
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In 1969, the Servier Laboratoires introduced trimetazidine, 1-(2, 3, 4-trimethoxybenzyl) piperazine dihydrochloride (Vastarel®) as a medicament for angina pectoris (1). This drug is assumed to reveal its remarkable action through decreasing cardiac work and lower ing the oxygen consumption of the heart (2), but other mechanisms of its action yet await ed clarification. Since trimetazidi...
متن کاملGender differences in effects of pinacidil but not diazoxide on heart automatism in the isolated guinea pig right atria.
UNLABELLED The aim of this paper was to investigate the effects of pinacidil and diazoxide, the activators of sarcolemmal and mitochondrial ATP-sensitive K(+) channels (K(ATP)), respectively, on heart rate and force of contraction in female and male guinea pigs. Experiments were performed on the isolated, spontaneously beating, right atria obtained from guinea pigs of both genders. First series...
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In this study we investigated the bronchodilatory and anticholinergic effects of the aqueous extract (AE), brewed extract (BE) and ethanol extract (EE) of Polygonum avicular in comparison with saline (S) on isolated tracheal chains of the guinea pig. Due to the probable confounding effect of ethanol in the EE, the effects of this extract were also compared with 96 % ethanol. None of the plant...
متن کاملSodium requirement for effects of ouabain on contraction of isolated guinea pig atria.
Reducing the sodium content of medium bathing isolated guinea pig atria produces a positive inotropic response associated with a marked decline in action potential amplitude and a decrease in relaxation velocity. The effects of sodium reduction appear to result from a decline in the rate of sodium-dependent calcium efflux across the sarcolemma. Consistent with this hypothesis, caffeine, which m...
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ژورنال
عنوان ژورنال: British Journal of Pharmacology
سال: 1984
ISSN: 0007-1188
DOI: 10.1111/j.1476-5381.1984.tb10102.x