Outline of the single-beat estimation of the preload recruitable stroke work relationship. Outline of the single-beat estimation of the preload recruitable.

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Outline of the single-beat estimation of the preload recruitable stroke work relationship. Outline of the single-beat estimation of the preload recruitable stroke work relationship. Mw and Dw represent the slope and dimension-axis intercept of the PRSW relationship, and the point (Dw, Mw) on the P–D plane is on the ESPDR curve represented by the red curve (equation (6) in the text). At the same time, by definition, Dw and Mw fulfil the following relationship: rSWsb=Mw×(Ded_sb—Dw), which is represented by the blue curve (equation (7) in the text). Therefore, once the ESPDR is determined, Dw and Mw can be calculated as the intersection of the red and blue curves. Ded_sb, end-diastolic dimensions of the baseline single beat; Des_sb, end-systolic dimensions of the baseline single beat; ESPDR, end-systolic pressure–dimension relation; Pes_sb, end-systolic pressure of the baseline single beat; P–D, pressure–dimension; PRSW, preload recruitable stroke work; rSWsb, regional stroke work of the baseline single beat. Ryo Inuzuka et al. Open Heart 2016;3:e000451 ©2016 by British Cardiovascular Society