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Figure 5 Comparison of resting end-systolic pressure/volume ratio (P_es/V_es) as an estimate of elastance to directly measured left ventricular end-systolic elastance (E_es) by invasive analysis. Unlike E_es(sb) (Fig. 3B), the pressure-volume ratio consistently overestimated directly measured E_es, and the regression had a non-zero bias (2.2 mm Hg/ml) as demonstrated in the lower Bland-Altman plot.