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A, Normalized N-terminal prohormone B-type natriuretic peptide (NT-proBNP) correlated against resistive afterload. B, Normalized NT-proBNP correlated against reactive afterload. C, Nonlinear multivariate regression function of reactive and resistive components of pulmonary vascular impedance correlated against normalized NT-proBNP. D, Normalized NT-proBNP correlated against arterial elastance (Ea). BSA: body surface area; C: capacitance; PVR: pulmonary vascular resistance.
