Sequence times of field resuscitation and outcomes sorted by initial ECG waveform classification
| Variables | VF/VT (n=33) | PEA (n=8) | Asystole (n=1) |
| First responder factors | |||
| Time from start of race to cardiac arrest occurrence, median (IQR), min | 160 (131.5, 202) | 104.5 (89.5, 185.5) | 99 (99, 99) |
| Recognition of gasping during cardiac arrest, n (%) | 32 (97%) | 6 (72%) | 0 (0%) |
| RMAEDS contact time, median (IQR), min | 1 (0.55, 2.5) | 0.9 (0.425, 2.5) | 6 (6, 6) |
| Interval between witnessing cardiac arrest and start of BCPR, median (IQR), min | 0.5 (0.5, 1) | 0.75 (0.5, 1.375) | 6 (6, 6) |
| AED analysis | |||
| Defibrillation by AED, n (%) | 32 (97%) | 1 (12.5%) | 0 (0%) |
| Interval between collapse to AED shock delivery, median (IQR), sec | 120 (65, 240) | NA | NA |
| Interval between powering on the AED and shock delivery, median (IQR), sec | 26.5 (21, 36) | NA | NA |
| Interval between collapse to first narrow QRS appearance, median (IQR), sec | 166 (95, 267) | NA | NA |
| EMS factors | |||
| Interval between collapse and ROSC, median (IQR), min | 4 (3, 7) | 2 (1, 6) | NA |
| Interval between collapse and EMS arrival, median (IQR), min | 14 (9.5, 16.5) | 12.5 (9.25, 16) | 23 (23, 23) |
| Interval between leaving the scene and hospital arrival, median (IQR), min | 40 (35, 40) | 40 (25.25, 40) | 41 (41,41) |
| Outcome variables | |||
| Sinus rhythm, n (%) | 31 (93.9%) | 7 (87.5%) | 0 (0%) |
| Field ROSC, n (%) | 32 (96.9%) | 7 (88%) | 0 (0%) |
AED, automated external defibrillator; CPC, cerebral performance category; EMS, emergency medical service; NA, not applicable; PEA, pulseless electrical activity; RMAEDS, rapid mobile automated external defibrillator system; ROSC, return of spontaneous circulation; VF, ventricular fibrillation.