Proportion of patients with cardiac arrest in hospital, attempts at resuscitation, and rhythm recorded, according to delay in presentation
| Delay (hours)4-151 | |||||
|---|---|---|---|---|---|
| ⩽ 1 | > 1, ⩽ 2 | >2, ⩽ 4 | > 4, ⩽ 12 | > 12 | |
| No of cases | 309 | 555 | 504 | 387 | 292 |
| No (%) with first cardiac arrest in hospital | 57 (18) | 74 (13) | 86 (17) | 64 (17) | 68 (23) |
| Median time (h) of first cardiac arrect after onset of symptoms | 4.4 | 6.3 | 18.2 | 25.3 | 55.5*** |
| No (%) of patients with arrest where resuscitation attempted | 47 (82) | 58 (78) | 57 (66) | 44 (69) | 43 (63)4-160 |
| No (%) of resuscitation attempts where VF was the first rhythm recorded | 31 (66) | 41 (71) | 33 (58) | 19 (43) | 22 (51)4-160 |
| No (%) of 30 day survivors of resuscitation | 24 (51) | 29 (50) | 27 (47) | 8 (21) | 6 (14)*** |