Figure 4From: High calcium and dobutamine positive inotropy in the perfused mouse heart: myofilament calcium responsiveness, energetic economy, and effects of protein kinase C inhibitionAveraged phase-plane plots for high perfusate calcium and dobutamine. While the increase in intracellular calcium is similar for both, at peak pressure the ratio of pressure to intracellular calcium is significantly higher with dobutamine (* p < 0.05).Back to article page