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In page PDE3 inhibitor:
"PDE3 inhibitors are a type of phosphodiesterase inhibitors. Inhibition of the PDE isoenzyme 3 leads to an increase of intracellular concentrations of the second messenger cyclic adenosine monophosphate (cAMP). cAMP mediates the phosphorylation of protein kinases, which in turn activates cardiac calcium channels. An increased calcium influx from the sarcoplasmic reticulum (SR) during phase 2 (the plateau phase) of the cardiac action potential leads to a positive inotropic effect of PDE3 inhibitors: they increase the force of cardiac contraction. Increased reflux of calcium into the SR following the plateau phase is responsible for their positive lusitropic effect: they increase relaxation speed. Additionally, PDE3 inhibitors act as vasodilators.[1][2]
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