Table 1. Patient characteristics.
| Characteristics | All n = 704 | < 1 yr n = 76 | > 1 yr n = 173 |
| Data are presented as n (%) unless other indicated. COPD: chronic obstructive pulmonary disease; CRT-D: cardiac resynchronization therapy defibrillators; CVA: cerebrovascular accident; TIA: Transient ischemic attack. | |||
| Age in years (range) | 82.0 (81.0-83.0) | 82.0 (81.0-84.0) | 81.0 (80.0-83.0) |
| Male | 585 (83.1%) | 67 (88.2%) | 144 (83.2%) |
| EF in % (range) | 33.0 (26.0-45.0) | 30.0 (25.0-40.0) | 33.0 (27.0-45.0) |
| NYHA class | |||
| I | 54 (7.7%) | 6 (7.9%) | 11 (6.4%) |
| II | 476 (67.6%) | 50 (65.8%) | 114 (65.9%) |
| III-IV | 174 (24.7%) | 20 (26.3%) | 48 (27.8%) |
| Comorbidities | |||
| Diabetes | 83 (11.8%) | 10 (13.2%) | 20 (11.6%) |
| COPD | 51 (7.2%) | 8 (10.5%) | 11 (6.4%) |
| CVA/TIA | 40 (5.7%) | 3 (3.9%) | 10 (5.8%) |
| Oncologic | 34 (4.8%) | 7 (9.2%) | 10 (5.8%) |
| Renal failure | 116 (16.5%) | 14 (18.4%) | 24 (13.9%) |
| Atrial fibrillation | 244 (34.7%) | 30 (39.5%) | 59 (34.1%) |
| LBBB | 183 (26.0%) | 18 (24.7%) | 30 (17.3%) |
| Upgrade from pacemaker | 80 (11.4%) | 11 (14.5%) | 13 (7.5%) |
| Prevention | |||
| Primary | 385 (54.7%) | 30 (39.5%) | 83 (48.0%) |
| Secondary | 319 (45.3%) | 46 (60.5%) | 90 (52.0%) |
| Indication | |||
| Ischemic | 471 (66.9%) | 51 (67.1%) | 125 (72.3%) |
| Non-ischemic | 233 (33.1%) | 25 (32.9%) | 48 (27.7%) |
| Type of device | |||
| VVI/DDD | 541 (76.8%) | 63 (82.9%) | 135 (78.0%) |
| CRT-D | 163 (23.2%) | 13 (17.1%) | 38 (22.0%) |
| QRS duration | |||
| < 120 ms | 458 (65.0%) | 49 (64.5%) | 123 (71.1%) |
| 120-150 ms | 67 (10.0%) | 11 (14.5%) | 5 (2.9%) |
| > 150 ms | 179 (25.0%) | 16 (21.0%) | 45 (26.0%) |