Table 1.
Baseline patient characteristics (n = 15)
| Sex (female/male) | 3/12 |
| Age (years) | 67 ± 8 |
| Aetiology (ischaemic/idiopathic) | 7/8 |
| NYHA functional class | 3 ± 0.4 |
| LV end-diastolic dimension (mm) | 73 ± 10 |
| LV end-systolic dimension (mm) | 59 ± 12 |
| LV ejection fraction (%) | 25 ± 5 |
| Sinus rhythm | 15 (100%) |
| PR interval (ms) | 197 ± 54 |
| QRS width (ms) | 181 ± 13 |
| Interval [bQRS–earliest point on the LV activation map] during intrinsic rhythm (ms) | 7 ± 7 |
| Interval [bQRS–RVEGM] during intrinsic rhythm (ms) | 50 ± 14 |
| Interval [bQRS–earliest point on the LV activation map] during RVA pacing (ms) | 30 ± 10 |
| Total LV endocardial activation time, intrinsic rhythm (ms) | 99 ± 30 |
| Total LV endocardial activation time, RVA pacing (ms) | 102 ± 21 |
| Total LV endocardial activation time, optimized (ms) | 93 ± 23 |
NYHA, New York Heart Association; LV, left ventricular; PR, QRS, and nQRS, narrow QRS complex; LBBB, left bundle branch block; bQRS, beginning of QRS; RVA, right ventricular apical; RVEGM, RV lead detected intracardiac electrogram.