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Figure 2 An example of the global and regional PRSW relationships derived from a series of LV pressure-volume loops recorded during a single vena caval occlusion. The global PRSW relationship is the relationship between stroke work, calculated as the pressure-volume loop area (shaded for one beat) and the corresponding end-diastolic volume for the same beat. Mw and Vw are the slope and volume-axis intercept, respectively, of the global PRSW relationship. Regional PRSW relationships are the relationships between regional stroke work (calculated as the pressure-dimension loop area formed by plotting LV pressure against the regional dimension) and the corresponding end-diastolic length of the base-apex or anterior-posterior dimension. aw and bw are the corresponding dimension-axis intercepts. LV = left ventricle; Mw = slope of the PRSW relationship; PRSW = preload recruitable stroke work; Vw = volume-axis intercept of the PRSW relationship.
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