Fig. 4

ROC curves for identification of CA etiology by echocardiographic factors. The AUC values of relative apical LS, basal LS, apical LS, LA reservoir strain, E/e’ and LAVi to differentiate between the CA and non-CA groups were 0.90, 0.89, 0.58, 0.81, 0.76 and 0.65, respectively. The AUC value of relative apical LS was significantly higher than that of LA reservoir strain (p < 0.01), while the AUC value of LA reservoir strain was significantly higher than that of the LAVi (p < 0.01). ROC, receiver operating characteristic; CA, cardiac amyloidosis; LS, longitudinal strain; LA, left atrial; LAVi, left atrial volume index; AUC, area under the curve