Table 2. Indication of epicardial ablation and procedure approach.

Heart disease	Number	Previous failed endocardial ablation	Reasons for limited epicardial ablation
BrS	16	4 (25.0%)	0 (0.0%)
ARVC	34	18 (52.9%)	1 (2.9%)	Adjacent to RCA
Idiopathic	13	12 (92.3%)	2 (15.4%)	1: No appropriate target by activation map
				1: Adjacent to LCA
IDCM	11	5 (45.5%)	0 (0.0%)
ICM	2	2 (100.0%)	0 (0.0%)
Others	4	1 (25.0%)	0 (0.0%)
Total	80	42 (52.5%)	3 (3.8%)

ARVC, arrhythmogenic right ventricular cardiomyopathy; BrS, Brugada syndrome; ICM, ischemic cardiomyopathy; IDCM, idiopathic dilated cardiomyopathy; LCA, left coronary artery; NICM, nonischemic cardiomyopathy; RCA, right coronary artery.