Table 3.
Clinical parameters before and after left bundle branch area pacing
| Baseline | Paced | P value | |
|---|---|---|---|
| Clinical response: (No HFH + improvement in NYHA class) | 53/89 (60%) | ||
| NYHA class | 2.5 ± 0.8 | 1.7 ± 0.8 | <.01 |
| Electrocardiographic response: | |||
| QRS duration (mm) | 156 ± 20 | 150 ± 24 | .01 |
| Normal axis | 25 (23) | 73 (68) | <.01 |
| Rightward axis | 15 (14) | 4 (4) | .01 |
| Leftward axis | 67 (63) | 30 (28) | <.01 |
| RBBB elimination | 35/107 (33%) | ||
| RBBB attenuation | 68/107 (64%) | ||
| Echocardiographic response: | |||
| EF improvement by >5% | 54/88 (61%) | ||
| Echo super-response | 12/48 (25%) | ||
| LVEF | 35 ± 9 | 43 ± 12 | <.01 |
| LVEF (≤35% baseline) | 27 ± 6 | 40 ± 11 | <.01 |
| LVEF (36%–50% baseline) | 42 ± 4 | 50 ± 8 | <.01 |
| LVEDD | 54 ± 12 | 52 ± 12 | .17 |
| LVESV | 95 ± 46 | 85 ± 44 | .20 |
| LVEDV | 136 ± 61 | 126 ± 54 | .31 |
Values are mean ± SD or n (%).
P values <.05 were considered statistically significant.
EF = ejection fraction; HFH = heart failure–related hospitalization; LVEDD = left ventricular end-diastolic diameter; LVEDV = left ventricular end-diastolic volume; LVEF = left ventricular ejection fraction; LVESV = left ventricular end-systolic volume; NYHA = New York Heart Association; RBBB = right bundle branch block.