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Rest- and stimulation frequency-dependent potentiation of contractile force is blunted in failing human myocardium. These alterations have been related to reduced sarcoplasmic reticulum (SR) Ca(2+)-reuptake and enhanced transsarcolemmal Ca(2+)-elimination by Na+/Ca(2+)-exchange. We investigated whether inotropic interventions that enhance SR Ca(2+)-uptake, or reduce Ca(2+)-elimination by Na+/Ca(2+)-exchange, normalize impaired post-rest and force-frequency behavior in left ventricular muscle strips from failing human hearts.

Gingerol, isoproterenol and ouabain normalize impaired post-rest behavior but not force–frequency relation in failing human myocardium