Adjustment of pacing intervals following optimisation of CRT
| 0 | 1–20 mS | 21–40 mS | 41–60 mS | 61–80 mS | 81–100 mS | |
| AV Adjustment | 29 (16.1) | 89 (49.4) | 22 (12.2) | 32 (17.8) | 7 (3.9) | 1 (0.6) |
| VV Adjustment | 50 (27.6) | 65 (35.9) | 53 (29.3) | 11 (6.1) | 0 | 1 (0.6) |
Data as N (%).