Table 1: Baseline patient characteristics.
| Total Cohort | BTE | RLB | |
|---|---|---|---|
| N | 21,121 | 7,240 | 4,920 |
| Median (IQR) | |||
| Age (years) | 62.0 (52.0-70.0) | 61.5 (52.0-70.0) | 62.0 (52.0-70.0) |
| Weight (kg) | 90.9 (77.3-113.4) | 90.7 (77.3-113.4) | 90.7 (79.2-113.4) |
| Dispatch to defib. (min.) | 11.1 (8.3-15.8) | 11.0 (8.3-15.3) | 11.3 (8.2-16.2) |
| Initial energy (Joules) | 200.0 (200.0-274.0) | 200.0 (200.0-360.0) | 200.0 (144.0-249.0) |
| Dose (J/kg) | 2.3 (1.8-3.2) | 2.8 (2.0-3.8) | 2.0 (1.5-2.7) |
| Response time | 6.0 (4.3-8.6) | 6.0 (4.3-8.4) | 6.0 (4.2-8.7) |
| n (%) | |||
| Sex | |||
| Male | 15,826 (75.0%) | 5,441 (75.2%) | 3,639 (74.0%) |
| Female | 5,283 (25.0%) | 1,797 (24.8%) | 1,278 (26.0%) |
| Witnessed | |||
| No | 5,502 (26.0%) | 1,923 (26.6%) | 1,295 (26.3%) |
| Yes | 13,494 (63.9%) | 4,611 (63.7%) | 3,139 (63.8%) |
| Unknown | 2,125 (10.1%) | 706 (9.8%) | 486 (9.9%) |
| Bystander CPR | |||
| No | 12,204 (57.8%) | 4,206 (58.1%) | 2,920 (59.3%) |
| Yes | 7,928 (37.5%) | 2,801 (38.7%) | 1,897 (38.6%) |
| Unknown | 989 (4.7%) | 233 (3.2%) | 103 (2.1%) |
| Rhythm | |||
| Ventricular fibrillation | 18,611 (88.1%) | 6,361 (87.9%) | 4,228 (85.9%) |
| Ventricular tachycardia | 1,386 (6.6%) | 441 (6.1%) | 389 (7.9%) |
| Unknown AED shockable | 1,124 (5.3%) | 438 (6.0%) | 303 (6.2%) |
| Etiology | |||
| Cardiac | 19,235 (91.1%) | 6,620 (91.4%) | 4,494 (91.3%) |
| Respiratory/asphyxia | 955 (4.5%) | 315 (4.4%) | 221 (4.5%) |
| Other | 926 (4.4%) | 304 (4.2%) | 205 (4.2%) |
| Location | |||
| Home/residence | 15,705 (74.4%) | 5,337 (73.7%) | 3,705 (75.3%) |
| Public | 5,416 (25.6%) | 1,903 (26.3%) | 1,215 (24.7%) |
| AED use PTA | |||
| No | 12,134 (57.5%) | 4,050 (56.0%) | 2,723 (55.4%) |
| Yes | 8,959 (42.5%) | 3,180 (44.0%) | 2,193 (44.6%) |
| Vascular access | |||
| Intravenous | 7,353 (34.8%) | 2,355 (32.5%) | 1,631 (33.2%) |
| Intraosseous | 12,233 (57.9%) | 4,412 (60.9%) | 2,979 (60.5%) |
| None | 1,535 (7.3%) | 473 (6.5%) | 310 (6.3%) |
| Airway | |||
| Endotracheal intubation | 9,747 (46.3%) | 3,546 (49.0%) | 1,946 (39.6%) |
| i-gel | 5,328 (25.3%) | 1,805 (25.0%) | 1,375 (28.0%) |
| King-LT | 2,766 (13.1%) | 862 (11.9%) | 766 (15.6%) |
| LMA | 434 (2.1%) | 75 (1.0%) | 253 (5.2%) |
| No advanced airway | 2,794 (13.3%) | 945 (13.1%) | 568 (11.6%) |
| ROSC | |||
| No | 12,099 (57.3%) | 4,067 (56.2%) | 2,840 (57.7%) |
| Yes | 9,022 (42.7%) | 3,173 (43.8%) | 2,080 (42.3%) |
| Survival to discharge | |||
| No | 2,004 (67.2%) | 829 (66.6%) | 515 (66.5%) |
| Yes | 977 (32.8%) | 416 (33.4%) | 260 (33.5%) |
| Survival to home | |||
| No | 2,306 (77.4%) | 958 (76.9%) | 609 (78.6%) |
| Yes | 675 (22.6%) | 287 (23.1%) | 166 (21.4%) |
Kg = kilograms, J = Joules, CPR = cardiopulmonary resuscitation, AED = automated external defibrillator, PTA = prior to arrival, LT = laryngeal tube, LMA = laryngeal mask airway, ROSC = return of spontaneous circulation.