Patient volume and TTM applied at the participating hospitals during the study period
| Classification | Category | n (%) |
|---|---|---|
| Number of patients with OHCA | <100 | 5 (23.8) |
| 100–199 | 9 (42.9) | |
| 200–299 | 6 (28.6) | |
| >300 | 1 (0.5) | |
| Number of patients with ROSC | <20 | 4 (19.0) |
| 20–39 | 4 (19.0) | |
| 40–59 | 8 (38.1) | |
| >60 | 5 (23.8) | |
| Number of patients treated with TTM | <5 | 8 (38.1) |
| 5–9 | 5 (23.8) | |
| 10–14 | 5 (23.8) | |
| >15 | 3 (14.3) | |
| TTM indicated initial rhythm | Shockable rhythm only | 4 (19.0) |
| All rhythm | 17 (81.0) | |
| TTM duration, h | 12 | 2 (9.5) |
| 24 | 19 (90.0) | |
| TTM target temperature, °C | 32–34 | 21 (100) |
| Main TTM device | Surface cooling without an automated feedback function | 19 (90.0) |
| Surface cooling with an automated feedback function | 1 (0.5) | |
| Endovascular cooling | 1 (0.5) |
OHCA, out-of-hospital cardiac arrest; ROSC, return of spontaneous circulation; TTM, targeted temperature management.