Table 1.
Characteristics of Patients With and Without Evidence of Septal VTs
| Nonseptal VTs (n = 41) | Septal VT (n = 33) | p Value | |
|---|---|---|---|
| No. of induced VTs (exit site identified) | 248 (172) | 160 | — |
| No. of septal VTs | — | 46 | — |
| Age, yrs | 69 ± 10 | 64 ± 9 | 0.03 |
| Women/men | 7/34 | 4/29 | NS |
| Ejection fraction | 30 ± 11 | 29 ± 15 | NS |
| QRS during VT, ms (exit site identified) | 207 ± 38 (203 ± 38) | 187 ± 45 | 0.003 (0.009) |
| VT morphology | |||
| LBBB (exit site identified) | 71 (51) | 21 | 0.03 |
| RBBB (exit site identified) | 177 (121) | 25 | (0.04) |
| VT cycle length, ms (exit site identified) | 370 ± 93 (386 ± 101) | 404 ± 100 | 0.02 (NS) |
| Infarct localization | 0.003 | ||
| Inferior | 33 | 18 | |
| Anterior | 8 | 19 | |
| Low-voltage area (−1.0 mV), cm2 | Median = 73; IQR = 45 | Median = 90; IQR = 86 | 0.10 |
| Coronary artery related to infarction | <0.0001 | ||
| LAD | 8 | 19 | |
| LCx | 19 | 0 | |
| RCA | 16 | 18 | |
Values are n (%), mean ± SD, or n, except for the low-voltage area, which was presented as median with interquartile range (IQR) because data were not normally distributed. Nonseptal ventricular tachycardias (VTs): no evidence of septal involvement based on pace-mapping or entrainment mapping.
LAD = left anterior descending artery; LBBB = left bundle branch block; LCx = left circumflex artery; RBBB = right bundle branch block; RCA = right coronary artery; VT = ventricular tachycardia.