Number of patients and survival rates according to number of shocks administered, presence of ambulance crew or witness for intubated and non-intubated subjects
| Intubated | 1–3 shocks | 4–6 shocks | 7+ shocks | Total | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number (%) | Survived (%) | Number (%) | Survived (%) | Number (%) | Survived (%) | Number (%) | Survived (%) | ||||||||||
| Crew | Yes | 33 (12.5)2-150 | 4 (12.1) | 9 (26.5)2-150 | 2 (22.2) | 10 (45.5)2-150 | 0 (0) | 52 (16.3) | 6 (11.5) | ||||||||
| No | 231 (87.5) | 125 (54.1) | 25 (73.5) | 9 (36.0) | 12 (54.5) | 7 (58.3) | 268 (84.7) | 141 (52.6)† | |||||||||
| Total | 264 | 129 (48.9) | 34 | 11 (32.4) | 22 | 7 (9.1) | 320 | 147 (45.9) | |||||||||
| Bystander | Yes | 729 (37.6)2-150 | 59 (8.9) | 270 (38.5)2-150 | 29 (7.8) | 308 (57.8)2-150 | 13 (4.2) | 1307 (41.2) | 101 (7.7) | ||||||||
| No | 1210 (62.4) | 199 (16.4) | 431 (61.5) | 52 (12.0) | 225 (42.2) | 9 (8.4) | 1866 (58.8) | 260 (13.9)† | |||||||||
| Total | 1939 | 258 (13.3) | 701 | 81 (11.6) | 533 | 22 (4.1) | 3173 | 361 (11.4) | |||||||||
| Unwitnessed | Yes | 139 (38.5)2-150 | 3 (2.0) | 61 (50.0)2-150 | 1 (0.1) | 32 (61.5)2-150 | 0 (0) | 232 (43.4) | 4 (1.7) | ||||||||
| No | 222 (61.5) | 13 (5.8) | 61 (50.0) | 0 (0) | 20 (38.5) | 0 (0) | 303 (56.6) | 13 (4.3) | |||||||||
| Total | 361 | 16 (4.4) | 122 | 1 (0.08) | 52 | 0 (0) | 535 | 17 (3.3) | |||||||||
↵2-150 p < 0.01 for intubated patients with 1–3 v4–6 and 7+ shocks. †p < 0.01 for intubated vnon-intubated.