Table 2.
Activation times
| Parameter | LVAT‐95 (ms) | p value | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Intrinsic, unpaced LBBB | 113 (104–123) | ||||||||
| Intrinsic narrow QRS | 47 (28–67)a | ||||||||
| Difference between the above groups | 67 (57–76) | <.0001 | |||||||
| HBP (in patients with LBBB) | 74 (67–81) | ||||||||
| His‐CRT type | HBP LVAT‐95 shortening (from intrinsic LBBB) | HBP LVAT‐95 shortening (from BVP) | BVP LVAT‐95 shortening (from intrinsic LBBB) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| N (%) | ∆LVAT‐95 (ms) | p value | N | ∆LVAT‐95 (ms) | p value | ∆LVAT‐95 (ms) | p value | ||
| All patients | 24 | 40 (29 – 50) | <.0001 | 20 | 27 (16 – 38) | .000242 | 9 (−2 – 20) | .167 | |
| Complete His‐CRT | 8 (33.3) | 52 (32 – 72) | .0005 | 7 | 40 (27 – 53) | .013 | 6 (−8 – 19) | .671 | |
| Incomplete His‐CRT | 13 (54.1) | 42 (33 – 51) | <.0001 | 10 | 17 (6 – 28) | .0589 | 25 (17 – 32) | <.0001 | |
| Failed His‐CRT | 3 (12.5) | n/a | n/ab | 3 | 30 (19 – 41) | .0516 | −33 (−22 – ‐44) | .0431 | |
Note: Values are mean ± 95% confidence interval except for intrinsic LVAT‐95 in narrow complex patients where normal range (99% range) is provided.
Abbreviations: BVP, biventricular pacing; CRT, cardiac resynchronization therapy; HBP, His bundle pacing; LBBB, left bundle branch block; LVAT‐95, left ventricular activation time of 95% of activations.
a
Normal range (99% range).
b
By definition <10 ms shortening.