The Inotropic Effect of the Active Metabolite of Levosimendan, OR-1896, Is Mediated through Inhibition of PDE3 in Rat Ventricular Myocardium Ørstavik, Øivind ; Manfra, Ornella ; Andressen, Kjetil Wessel ; Andersen, Geir Øystein ; Skomedal, Tor ; Osnes, Jan-Bjørn ; Levy, Finn Olav ; Krobert, Kurt Allen Abstract Publication: PLoS ONE Pub Date: March 2015 DOI: 10.1371/journal.pone.0115547 Bibcode: 2015PLoSO..1015547O