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Figure 5 Receiver-operating characteristic curves for detection of left ventricular ejection fraction (LVEF) <30% (top), 40% (middle), or 50% (bottom) by brain natriuretic peptide (BNP) (solid lines) and amino terminal pro-brain natriuretic peptide (NTproBNP) (dotted lines) in 1,049 patients with stable ischemic heart disease. Curves do not significantly differ for any level of LVEF. AUC = area under the curve.