by combined treatment with isoproterenol and verapamil , a substance which is known to decrease the calcium conductivity of myocardial cell membranes without blocking beta-adrenergic receptors , the isoproterenol-stimulated 45ca uptake by prenecrotic cardiomyopathic hearts as well as the increase of their calcium content could be inhibited .
C0027061
myocardial
C0018787
hearts