Ethacrynic Acid Induced Inotropism

Arthur H From, Jeffrey L. Probstfield, Thomas R. Smith

Research output: Contribution to journalArticlepeer-review


Ethacrynic acid (ECA), a sulfhydryl group inhibiting diuretic was examined for positive inotropic effects. These were found to be present in isolated guinea pig left atria studied in 0.9 and 1.8 mM Ca bathing solutions and were partially dependent upon adrenergic mechanisms (presumably secondary to norepinephrine release from sympathetic nerve endings) and partly independent of such mechanisms as demonstrated by propranolol induced β-blockade and reserpine-induced catecholamine depletion. The mechanism of the non-β adrenergic inotropism is unclear but may relate to the ability of ECA to inhibit the sarcolemmal Na-K-Mg-dependent ATPase. ECA-induced premature contractile failure occurred in all atria as well as a late increase in diastolic tension, the latter being comparable to that described for toxic doses of cardiac glycosides in similar preparations. The authors wish to thank Merck Sharp and Dohme, West Point, Pennsylvania 19486, for the generous gift of ethacrynic acid.

Original languageEnglish (US)
Pages (from-to)1059-1062
Number of pages4
JournalProceedings of the Society for Experimental Biology and Medicine
Issue number4
StatePublished - Sep 8 1975

Bibliographical note

Funding Information:
This investigation was supported in part by grants from the Minnesota Heart Association, the Graduate School of the University of Minnesota, and Minnesota Medical Foundation.


Dive into the research topics of 'Ethacrynic Acid Induced Inotropism'. Together they form a unique fingerprint.

Cite this