Linked Life Data

611068

Source:http://linkedlifedata.com/resource/pubmed/id/611068

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pubmed-article:611068pubmed:abstractTextIn isolated rabbit left atria driven electrically at a frequency of 30/min, the contraction was abolished by increasing external K+ concentrations from 5.4 to 22mM. Addition of isoproterenol (10(-6)M) restored the atrial contraction and the magnitude of contractions increased by raising external concentrations of Ca++ to 4.4 and 6.6. mM. Hexobendine attenuated the magnitude of contractions restored by isoproterenol and excess Ca++ in a dose-dependent manner, as did prenylamine and verapamil. Hexobendine did not significantly influence the membrane depolarization induced by excess K+ and there was no evidence of a beta-adrenergic blocking action. In helical strips of rabbit aortae exposed to Ca++-free media and depolarized by excess K+, the addition of Ca++ caused a marked contraction. Hexobendine, prenylamine and verapamil caused a dose-related attenuation of the Ca++-induced contraction. Relative potencies of the inhibition by hexobendine, prenylamine and verapamil were 1:16.5:100. Inhibitory effects of these drugs were partially antagonized by excess Ca++. Greater attenuation of the contractile response to 25 mM K+ than the response to 2 X 10(-6)M noradrenaline was observed in preparations treated with hexobendine. It may be concluded that interference with the influx of Ca++ across cell membrane in atrial muscles and aortic smooth muscles participates in the inhibition of contractility by hexobendine.lld:pubmed
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pubmed-article:611068pubmed:articleTitle[Influence of hexobendine, prenylamine and verapamil on the contractile response of isolated rabbit left atria and aortae to calcium (author's transl)].lld:pubmed
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