Table 2.
ECG findings and CMR in patients with RBBB superior or intermediate axis PVCs
| Variable | RBBB superior or intermediate axis |
P | |
|---|---|---|---|
| LGE + | LGE − | ||
| n = 31 | n = 51 | ||
| QRS, msec | 139.5 ± 19.9 | 145.4 ± 16.4 | 0.150 |
| QRS notching in one or more leads, n (%) | 11 (35.5) | 25 (49) | 0.259 |
| QRS ≥ 120 msec in lead I, n (%) | 19 (61.3) | 27 (52.9) | 0.499 |
| Maximal QRS duration >160 msec, n (%) | 10 (32.3) | 19 (37.3) | 0.812 |
| Intrinsicoid deflection >80 msec, n (%) | 8 (25.8) | 14 (27.5) | 0.925 |
| Initial slurring (pseudo-delta), n (%) | 7 (22.6) | 15 (29.4) | 0.610 |
| Q-wave in lead I, n (%) | 10 (32.3) | 8 (15.7) | 0.101 |
| qR morphology in lead V1, n (%) | 2 (6.4) | 27 (52.9) | <0.0001 |
| qR morphology in lead aVR, n (%) | 4 (12.9) | 40 (78.4) | <0.0001 |
| qR morphology in lead aVR and V1, n (%) | 0 (0) | 26 (51) | <0.0001 |
| QS morphology in lead aVR, n (%) | 0 (0) | 0 (0) | 1.000 |
Values are mean ± SD unless specified.
Abbreviations: CMR, cardiac magnetic resonance; n, number of patients; PVCs, premature ventricular complex; RBBB, right bundle branch block.