Survival by presenting rhythm
| Rhythm | Crew witnessed | Not crew witnessed | All* | ||||||
| N | Survived | N | Survived | N | Survived | ||||
| n | % | n | % | n | % | ||||
| VF | 20 | 5 | 25.0 | 395 | 15 | 3.8 | 415 | 20 | 4.8 |
| Asystole | 3 | 0 | 0.0 | 414 | 1 | 0.2 | 417 | 1 | 0.2 |
| PEA | 24 | 2 | 8.3 | 146 | 2 | 1.4 | 170 | 4 | 2.3 |
| Unknown | 11 | 1 | 9.9 | 99 | 1 | 1.0 | 110 | 2 | 1.8 |
| Total | 58 | 8 | 13.8 | 1054 | 19 | 1.8 | 1112 | 27 | 2.4 |
↵* For 49 patients there was no information about whether the arrest was witnessed.
PEA, pulseless electrical activity; VF, ventricular fibrillation.