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ROC curve of 2-hour (A) and 4-hour (B) stress-delta NT-proBNP. Two-hour stress-delta NT-proBNP shows modest predictive ability of ischaemia on stress test imaging with an AUC of 0.7162. Four-hour stress-delta shows an AUC of 0.7185. AUC, area under the curve; NT-proBNP, N-terminal pro-B type natriuretic peptide; ROC, receiver operating characteristic.
