Patient Characteristics
The baseline characteristics of the 8 included patients are summarized in Table 1. Multiple reentrant circuits occurred both in patients with a postablation history (6 patients) and those without a history of previous surgical or catheter intervention (2 patients). One patient had dilated cardiomyopathy with left bundle branch block (LBBB) and was treated with CRT-D. One patient experienced ablation of the CTI due to typical atrial flutter. Five patients experienced AF ablation, and the other 2 patients had no obvious structural heart disease detectable by echocardiography and no history of previous surgical or catheter intervention. Six patients experienced AF ablation without any fragmented EGM-based ablation.