1991 年 55 巻 11 号 p. 1068-1076
To evaluate the effects of a new phosphodiesterase inhibitor. E-1020 (1, 2-dihydro-6-methyl-2-oxo-5-(imidazo [1, 2-a] pyridin-6-yl)-3-pyridine carbonitrile hydrochloride monohydrate), on cardiovascular hemodynamics in acute heart failure, we compared its effects with those of dopamine on experimentally produced acute mitral regurgitation in dogs. After the production of mitral regurgitation by transmyocardial chordal sectioning and obtaining a stable state, dopamine (5μg/kg/min) was infused until the peak positive dP/dt (peak (+) dp/dt) increased to about 50% of the pre-dopamine value. After complete recovery. E-1020 (30μg/kg) was infused over 5 min and the data were obtained 10 min later. Both drugs equally increased peak ( + ) dp/dt, decreased systemic vascular resistance. and increased cardiac output. Left ventricular (LV) end-diastolic pressure. LV end-diastolic segment length (EDL). and mean left atrial (LA) pressure decreased with both drugs. The changes in EDL and mean LA pressure were larger with E-1020 than with dopamine (p<.01 and p<.05). Although mean inferior vena caval blood flow volume (mIVCF) increased and mean inferior vena caval pressure decreased with both drugs, the increment of mIVCF was smaller with E-1020 (p<.001). Thus. E-1020 had not only a positive inotropic effect but also a vasodilatory action both on resistance vessels and on capacitance vessels.
