Brugada type 1 electrocardiogram: Should we treat the electrocardiogram or the patient?

Table 1 Prevalence of risk factors in patients without previous cardiac arrest who underwent implantable cardioverter defibrillator implantation in primary prevention, cumulative analysis of 5 large studies¹

Studies	n. pts	Spont. type 1 ECG	Drug-I type 1 ECG	Fam. SCD	Syncope	Asympt.	+EPS/EPS performed
Sacher et al[8]	202	61% (124)	49% (78)	42% (85)	35% (70)	65% (132)	82% (153/187)
Kamakura et al[9]	70	66% (44)	34% (26)	23% (16)	46% (32)	54% (38)	87% (58/67)
Sarkozy et al[10]	47	62% (29)	38% (18)	55% (26)	55% (26)	45% (21)	83% (38/46)
Delise et al[11]	110	74% (82)	26% (28)	38% (42)	58% (64)	42%	85% (90/106)
Priori et al[12]	137	NA	NA	NA	NA	NA	72% (98/137)
Total	566	65% (279/429)	35% (150/429)	39% (169/429)	45% (192/429)	65% (237/429)	80% (437/543)

¹From Delise et al[6], modified. Spont.: Spontaneous; Drug-I: Drug-induced; Fam. SD: Familial sudden death; Asympt.: Asymptomatic; EPS: Electrophysiologic study; NA: Not available.