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. 1964 Aug;23(1):66–79. doi: 10.1111/j.1476-5381.1964.tb01567.x

Calcium in relation to the actions of ouabain and adrenaline on the heart

J M G Walker, M Weatherall
PMCID: PMC1703960  PMID: 14206270

Abstract

Isolated pairs of rabbit auricles have been observed in media containing 6, 24 or 75 mM-potassium, with corresponding reductions in sodium concentration. In 24 mM-potassium, adrenaline restored beating and excitability, as did calcium chloride, but ouabain had no effect. In 75 mM-potassium, adrenaline had no effect; calcium chloride caused a contracture; ouabain had no direct effect, but auricles which had been beating in the presence of ouabain contracted promptly on transfer to 75 mM-potassium. Left auricles, which do not beat spontaneously, were less sensitive to calcium and to ouabain. The results showed a membrane stabilizing action of calcium and an action on muscular contraction, and suggested that cardiac glycosides acted by causing accumulation of calcium at the activator site in the tissue.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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