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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 Mw are sensitive to the inotropic stimulation. There were no significant differences between multibeat and single-beat Mw values. Bottom panel: The corresponding ESPVR (Vo and Ees), single-beat Ees and PWRmax/EDV2 data (see text). Ees = slope of the ESPVR; Mw = slope of the PRSW relationship; PWRmax/EDV2 = maximum left ventricular power divided by the square of end-diastolic volume; Vo = volume-axis intercept of the ESPVR; Vw = volume-axis intercept of the PRSW relationship. *p < 0.05 vs. control.
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