4.1 Main findings
This study demonstrated that (1) NPAs were mostly found around the PV antrum, (2) the fibrotic tissue properties of the NPAs predominantly consisted of heterogenous fibrotic tissue with an LGE-entropy of ≧ 5.7 and LGE-volume ratio of ≧ 10%, (3) no NPAs could be found in the dense fibrotic tissue areas with an LGE-volume ratio of ≧ 50%, and (4) there was no significant correlation between the NPAs and CFAE areas.