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Figure 6 Top panel: The effects of calcium infusion on the mean multibeat and single-beat PRSW estimates in Group II dogs. Both multibeat and single-beat M_w are sensitive to the inotropic stimulation. There were no significant differences between multibeat and single-beat M_w values. Bottom panel: The corresponding ESPVR (V_o and E_es), single-beat E_es and PWR_max/EDV² data (see text). E_es = slope of the ESPVR; M_w = slope of the PRSW relationship; PWR_max/EDV² = maximum left ventricular power divided by the square of end-diastolic volume; V_o = volume-axis intercept of the ESPVR; V_w = volume-axis intercept of the PRSW relationship. *p < 0.05 vs. control.