Figure legends
Figure 1  The distribution of the NPAs detected by ExTRa Mapping. LAA = left atrial appendage; NPA = non-passively activated area; PV = pulmonary vein.
Figure 2  The distribution of the NPAs and PAs according to the LGE-entropy and LGE-volume ratio. The NPAs (red) and PAs (blue). The NPAs and PAs were classified into 4 groups (group1 to 4) according to an LGE-entropy of 5.7 and LGE-volume ratio of 10%. LGE = late gadolinium enhancement; NPA = non-passively activated area; PA = passively activated area.
Figure 3  The proportion of NPAs grouped by the tissue properties.
NPA = non-passively activated area.
Figure 4  The proportion of fibrotic tissue properties between the NPAs and PAs. NPA = non-passively activated area; PA = passively activated area.
Figure 5  Representative case in our study. ExTRa Mapping with the NavX system in the AP (A) and PA (B) views. The 3D ablation tags were colored as red, pink, light pink, and gray according to the LSI values (red: >5; pink: >4; light pink: >3; and gray: <3.0). The red, orange, yellow, green, and light blue circles indicate the NPAs with a high %NP of 84, 67, 60, 54, and 52%, respectively. The 3D LGE-MRI of the LA in the AP (C) and PA (D) views. The red, orange, yellow, light blue and green circles correspond to those in panel A. Five NPAs continuously distributed on the anterior roof of the LA where both the LGE-entropy and LGE-volume ratio were higher than 5.7 and 10%, respectively. AP = anterior-posterior; CFAE = complex fractionated atrial electrograms; LA = left atrium;
LGE-MRI = late-gadolinium enhancement magnetic resonance imaging; LSI = lesion size index; NPA = non-passively activated area; PA = posterior-anterior; %NP = non-passively activated ratio.
Figure 6  Relationship between the CFAE areas and NPAs. The no relationship between the CFAE areas and NPAs was found. CFAE = complex fractionated atrial electrograms; NPA = non-passively activated area.