Table 1.
A. Baseline Characteristics by QRS Score Group for Conventional Medical Therapy Arm: Data Are Presented as Mean ± Standard Deviation or N (%) of the Population
| Clinical Characteristics | Conventional Medical Therapy Arm | |||
|---|---|---|---|---|
| QRS Low (0–3) | QRS Med (4–7) | QRS High (≥8) | P‐ | |
| N = 104 | N = 135 | N = 164 | Value | |
| Age at randomization | 65 ± 11 | 66 ± 10 | 63 ± 11 | 0.066 |
| Body mass index (kg/m2) | 28 ± 5 | 28 ± 5 | 28 ± 5 | 0.701 |
| Systolic blood pressure | 123 ± 20 | 123 ± 19 | 118 ± 16 | 0.012 |
| Diastolic blood pressure | 71 ± 10 | 70 ± 10 | 70 ± 11 | 0.537 |
| Heart rate | 71 ± 12 | 72 ± 12 | 72 ± 13 | 0.951 |
| QRS duration (s) | 0.12 ± 0.03 | 0.12 ± 0.03 | 0.12 ± 0.03 | 0.378 |
| Number of prior hospitalizations | 1.3 ± 1.3 | 1.1 ± 1.2 | 1.1 ± 1.4 | 0.244 |
| MI months before enrollment | 73 ± 69 | 75 ± 72 | 72 ± 69 | 0.877 |
| Blood urea nitrogen | 23 ± 12 | 23 ± 12 | 24 ± 13 | 0.989 |
| Creatinine | 1.3 ± 0.8 | 1.3 ± 0.4 | 1.3 ± 0.5 | 0.402 |
| Female | 22 (21%) | 20 (15%) | 21 (13%) | 0.177 |
| White race | 86 (83%) | 122 (90%) | 139 (85%) | 0.205 |
| Left bundle branch block | 27 (26% | 26 (19%) | 18 (11%) | 0.007 |
| Right bundle branch block | 1 (1%) | 4 (3%) | 21 (13%) | <0.001 |
| Atrial fibrillation | 5 (5%) | 14 (10%) | 15 (9%) | 0.280 |
| CHF NYHA Class II‐IV | 68 (65%) | 82 (61%) | 97 (59%) | 0.543 |
| EF < 25% | 49 (47%) | 65 (48%) | 84 (51%) | 0.837 |
| Diabetes | 42 (40%) | 54 (40%) | 59 (36%) | 0.730 |