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The relationship of selected PDF parameters and indexes computed from them vs. age. A) The PDF parameter c increases monotonically with age. B) Initial potential energy, defined by 1/2kxo2, increases with age. C) The volume delivered during early filling per unit amount of potential energy at the onset of diastole decreases with age. D) The peak atrio-ventricular pressure gradient during early filling (kxo) increases with age. See text for details
