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Background Istaroxime is an inhibitor of Na+/K+ ATPase with proven efficacy to increase cardiac contractility and to accelerate relaxation attributable to a relief in phospholamban-dependent inhibition of the sarcoplasmic reticulum Ca2+ ATPase. We have previously shown that pharmacologic Na+/K+ ATPase inhibition promotes calcium/calmodulin-dependent kinase II activation, which mediates both cardiomyocyte death and arrhythmias. Here, we aim to compare the cardiotoxic effects promoted by classic pharmacologic Na+/K+ ATPase inhibition versu