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Scatter plot relating ventricular-arterial coupling ratio (E LVI/E aI) and left-ventricular ejection fraction (LVEF). (a) Resting values; (b) peak stress values; (c) E LV I/E aI and LVEF reserve values. Green circles: patients with follow-up events. Blue circles: patients without follow-up events. E aI: arterial elastance index; E LVI: LV end-systolic elastance index; E LVI/E aI: ventricular-arterial coupling ratio.
