Table 1 The clinical characteristics
| Â | Total | pH on blood gas analysis before ECPR started | ||
|---|---|---|---|---|
| Â | Tertile 1 | Tertile 2 | Tertile 3 | |
Parameters |  | (≥ 7.03) | (7.029–6.875) | (< 6.875) |
(N = 260) | (N = 86) | (N = 88) | (N = 86) | |
Men | 197 (75.8%) | 63 (73.3%) | 65 (73.9%) | 69 (80.2%) |
Age, years | 62.5 (49–71) | 67 (56.8-75.3) | 63.5 (49–69.8) | 55.5 (46–66) |
 18–65 | 146 (56.2%) | 38 (44.2%) | 48 (54.5%) | 60 (69.8%) |
 65–74 | 72 (27.7%) | 22 (25.6%) | 30 (34.1%) | 20 (23.3%) |
 ≥ 75 | 42 (16.2%) | 26 (30.2%) | 10 (11.4%) | 6 (7.0%) |
Cause of cardiac arrest | ||||
 Cardiac | 245 (94.2%) | 81 (94.2%) | 83 (94.3%) | 81 (94.2%) |
Pre-hospital information | ||||
 Bystander witness | 206 (79.2%) | 66 (76.7%) | 71 (80.7%) | 69 (80.2%) |
 Bystander CPR | 120 (46.2%) | 36 (41.9%) | 42 (47.7%) | 42 (48.8%) |
 Shockable on initial rhythm | 175 (67.3%) | 58 (67.4%) | 63 (71.6%) | 54 (62.8%) |
 Advanced airway | 110 (69.6%) | 33 (67.3%) | 32 (69.6%) | 45 (71.4%) |
In-hospital information | ||||
Cardiac rhythm on arrival | ||||
  ROSC | 22 (8.5%) | 14 (16.3%) | 6 (6.8%) | 2 (2.3%) |
  Shockable | 121 (46.5%) | 39 (45.3%) | 41 (46.6%) | 41 (47.7%) |
  Non-shockable | 117 (45%) | 33 (38.4%) | 41 (46.6%) | 43 (50%) |
pH value before ECPR start | 6.95 (6.83–7.08) | 7.13 (7.08–7.20) | 6.95 (6.91–6.99) | 6.78 (6.72–6.83) |
Time course, min | ||||
 E-call to hospital arrival | 31 (25–38) | 30 (22–36) | 30 (26–37.5) | 35 (28–44) |
 E-call to collect BGA | 39 (32–48) | 35 (29–45) | 39.5 (33.3–46.0) | 43.5 (36.0–54.0) |
 E-call to start ECPR | 60 (51–79) | 60 (50.8–90.5) | 61.5 (51.3–82) | 59 (51.0–71.8) |