Definition of the ‘patchy’ LGE site
The LGE site was classified into the dens or patchy LGE site. An animal study reported that the maximum gap length with conduction block was 4 mm.10 According to the result, the patchy LGE site was defined as the site where the at least two small LGE could distributed within 5mm diameter (Figure 2). Based on this definition, the patchy LGE site appeared inhomogeneous infiltration of atrial tissue by LGE, while the dense LGE site appeared homogenous and strong infiltration of atrial tissue by LGE.