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ROC curve analysis. Diagnostic value of NT-proBNP for fQRS. The optimal cutoff value of NT-proBNP level was 801.5 pg/ml, with a specificity of 70% and sensitivity of 80.8%. The AUC using this NT-proBNP level to predict fQRS was 0.809 (p < 0.001). AUC, area under the curve; fQRS, Fragmented QRS; NT-proBNP, N-terminal pro-brain natriuretic peptide; ROC, receiver operating characteristic curve.
