Table 3.
Cardiac resynchronization therapy benefit in left bundle branch block and non–left bundle branch block patients depending on intrinsic interventricular delay
| Patient subgroup | N | CBI, mean (SD) | LVESV change, mean (SD) |
|---|---|---|---|
| LBBB | |||
| RVs-LV1s ≥34 ms (above the lower quartile) | 93 | 6.7 (5.7) | -24.9 (29.4) |
| RVs-LV1s <34 ms (below the lower quartile) | 13 | 2.7 (6.3) | -9.6 (28.7) |
| No LBBB | |||
| RVs-LV1s ≥34 ms | 34 | 2.6 (4.3) | -8.4 (21.1) |
| RVs-LV1s <34 ms | 34 | 2.8 (5.1) | -5.0 (28.7) |
CBI = composite benefit index; CRT, cardiac resynchronization therapy; LBBB = left bundle branch block; LVESV = left ventricular end-systolic volume; RVs-LV1s = intrinsic interventricular delay; SD = standard deviation.