Figure 4

ROC curve analysis of differential metabolites. (a–d) ROC curve analysis of the atrial appendage samples. (e–g) ROC curve analysis of the plasma samples. The metabolites A, B, C, D, and E represent D-glutamic acid, creatinine, choline, niacinamide, and hypoxanthine, respectively. The sensitivity (true positive rate) was set as the ordinate, and 1-specificity (false positive rate) was set as the abscissa. An AUC value approaching 1.0 indicates a better diagnostic effectiveness.