Key result
MCI-154 infusion (0.1-3.0 microg/kg/min) in intact pigs decreased systemic vascular resistance and significantly reduced mechanoenergetic efficiency across all doses, with minimal inotropic action.
Why the study?
Does MCI-154 improve cardiac contractility and mechanoenergetic efficiency in intact pigs?
Does MCI-154 improve cardiac contractility and mechanoenergetic efficiency in intact pigs?
In intact pigs, the Ca2+-sensitizer MCI-154 demonstrated minimal inotropic action but significant vasodilation and reduced mechanoenergetic efficiency, suggesting a dominant phosphodiesterase inhibitory effect.
MCI-154 impairs efficiency via vasodilation in pigs; leaves open its value as Ca2+-sensitizer and supports PDE inhibition as dominant mechanism.
OBJECTIVE: Ca(2+)-sensitizing agents hold potential as ideal cardiac inotropes, but effects in intact animals are scarcely described. We evaluated a pyridazinone derivative, MCI-154, for hemodynamic, inotropic, mechanoenergetic and oxidative metabolic effects. DESIGN: Intracavitary left ventricular (LV) pressure and conductance (volume) was assessed in open chest anesthetized pigs (n = 6). Contractile performance, pressure-volume area (PVA) and myocardial oxygen consumption (MVO(2)) were assessed. Myocardial substrate uptake and production of (14)CO(2 )(from glucose) and (3)H(2)O (from fatty acids) were monitored. MCI-154 administration: "low range": 0.1, 0.2, 0.3, 0.5 microg/kg/min and "high range": 0.75, 1.0, 2.0, 3.0 microg/kg/min. Parameters were compared with baseline and a time reference group (n = 7). RESULTS: MCI-154 induced a progressive dose-dependent decrease in systemic vascular resistance, with a concomitant increase in heart rate and cardiac output. Contractility increased only in the high-dose range, and mechanoenergetic efficiency was significantly reduced by drug infusion in all doses. CONCLUSION: The pyridazinone derivative MCI-154 has minimal inotropic action, induces a significant "oxygen waste", and decreases vascular resistance in intact pigs. A potent phosphodiesterase inhibitory effect may explain this, which suggests further drug refinement.
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Korvald et al. (2002) studied this question. MCI-154 vs. Baseline and time reference group was evaluated on Hemodynamic, inotropic, mechanoenergetic and oxidative metabolic effects. MCI-154 infusion (0.1-3.0 microg/kg/min) in intact pigs decreased systemic vascular resistance and significantly reduced mechanoenergetic efficiency across all doses, with minimal inotropic action.
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