Demographics and case mix by day/time of IHCA
| Weekday daytime | Weekend daytime | Night-time | |
|---|---|---|---|
| Number of IHCAs, n (%) | 10 113 (36.5) | 3829 (13.8) | 13 758 (49.7) |
| Rate per 1000 hospital admissions per 12 h, mean (CI) | 0.135 (0.133 to 0.138) | 0.127 (0.123 to 0.131) | 0.131 (0.129 to 0.133) |
| Age mean (SD) | 73.4 (14.2) | 73.8 (14.3) | 74.0 (14.4) |
| Sex males (%) | 5724 (56.6) | 2144 (56.0) | 7943 (57.7) |
| Length of stay in hospital prior to IHCA, n (%) (N=27 693) | |||
| 0 days | 3405 (33.7) | 1181 (30.9) | 2915 (21.2) |
| 1 day | 1531 (15.2) | 553 (14.4) | 2653 (19.3) |
| 2–7 days | 2919 (28.9) | 1218 (31.8) | 4813 (35.0) |
| ≥8 days | 2253 (22.3) | 876 (22.9) | 3376 (24.5) |
| Reason for admission to/attendance at/visit to hospital, n (%) (N=27 694) | |||
| Medical | 7993 (79.1) | 3139 (82.0) | 11 373 (82.7) |
| Trauma | 372 (3.7) | 158 (4.1) | 529 (3.8) |
| Elective/scheduled surgery | 696 (6.9) | 201 (5.3) | 692 (5.0) |
| Emergency/urgent surgery | 737 (7.3) | 300 (7.8) | 1107 (8.1) |
| Obstetric | 18 (0.2) | 5 (0.1) | 33 (0.2) |
| Outpatient | 249 (2.5) | 16 (0.4) | 14 (0.1) |
| Staff/visitor | 45 (0.4) | 9 (0.2) | 8 (0.1) |
| Location of IHCA n (%) (N=27 698) | |||
| Ward, obstetrics or intermediate care | 5355 (53.0) | 2231 (58.3) | 8746 (63.6) |
| Emergency department | 1145 (11.3) | 473 (12.4) | 1224 (8.9) |
| Emergency admissions unit | 850 (8.4) | 306 (8.0) | 1242 (9.0) |
| Theatre and recovery | 228 (2.3) | 47 (1.2) | 85 (0.6) |
| Cardiac catheterisation laboratory | 466 (4.6) | 86 (2.2) | 161 (1.2) |
| Imaging department or specialist treatment | 519 (5.1) | 90 (2.4) | 121 (0.9) |
| ICU, ICU/HDU or HDU | 463 (4.6) | 218 (5.7) | 891 (6.5) |
| Coronary care unit | 918 (9.1) | 366 (9.6) | 1265 (9.2) |
| Clinic or non-clinical area | 168 (1.7) | 12 (0.3) | 22 (0.2) |
| Presenting/first documented rhythm, n (%) (N=27 700) | |||
| Shockable—VF | 1322 (13.1) | 420 (11.0) | 1234 (9.0) |
| Shockable—pVT | 536 (5.3) | 192 (5.0) | 557 (4.0) |
| Shockable—unknown | 64 (0.6) | 27 (0.7) | 64 (0.5) |
| Non-shockable—asystole | 1883 (18.6) | 779 (20.3) | 3959 (28.8) |
| Non-shockable—PEA | 5264 (52.1) | 2014 (52.6) | 6729 (48.9) |
| Non-shockable—bradycardia | 63 (0.6) | 16 (0.4) | 36 (0.3) |
| Non-shockable—unknown | 214 (2.1) | 83 (2.2) | 285 (2.1) |
| Unknown | 767 (7.6) | 298 (7.8) | 894 (6.5) |
| Predicted probabilities (%) from the NCAA risk models median (IQR) (N=27 689) | |||
| ROSC>20 min | 43 (34 to 62) | 41 (33 to 59) | 43 (28 to 55) |
| Hospital survival | 13 (7 to 30) | 12 (6 to 25) | 10 (5 to 21) |
HDU, high dependency unit; ICU, intensive care unit; IHCA, in-hospital cardiac arrest—day/time categorised by 2222 call; NCAA, National Cardiac Arrest Audit; PEA, pulseless electrical activity; pVT, pulseless ventricular tachycardia; ROSC>20 min, return of spontaneous circulation for >20 min; VF, ventricular fibrillation.