Table 2.
Clinical and ECG Characteristics in Each Group
| Characteristics | Group VF | Group SY | Group AS | P Value |
|---|---|---|---|---|
| (n=26) | (n=54) | (n=129) | ||
| Age, y | 41±12 | 45±13 | 45±14 | NS |
| Male sex | 26 (100) | 50 (93) | 124 (96) | NS |
| FH of SCD | 5 (19) | 12 (22) | 19 (15) | NS |
| SCN5A mutation | 3/18 (17) | 9/35 (26) | 5/40 (13) | NS |
| ICD implantation | 26 (100) | 36 (67) | 17 (13) | <0.001 |
| Induced VF with PES | 6/15 (40) | 9/39 (23) | 7/36 (19) | NS |
| Inferolateral ER pattern | 2 (8) | 3 (6) | 14 (11) | NS |
| CRBBB | 7 (27) | 5 (9) | 8 (6) | <0.01 |
| fQRS | 11 (42) | 13 (24) | 20 (16) | <0.01 |
| Prominent S in lead I | 18 (69) | 31 (57) | 62 (48) | NS |
| No. of type 1 ECGs | 5.1±2.1 | 4.6±2.5 | 4.3±2.0 | NS |
Values are number (percentage), number/total (percentage), or mean±SD. AS indicates patients without any symptoms; CRBBB, complete right bundle branch block; ER, early repolarization; FH, family history; fQRS, fragmented QRS; ICD, implantable cardioverter‐defibrillator; No. of type 1 ECGs, the number of ECG leads showing type 1 morphological features among 9 right precordial leads; NS, not significant; PES, programmed electrical stimulation; SCD, sudden cardiac death; SY, patients with a previous syncope episode; VF, (patients with documented) ventricular fibrillation.