Table 2.
Patients’ characteristics and outcomes of this study by PaCO2 immediately after return of spontaneous circulation.
| PaCO2 Level | p | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (n = 607) | |||||||||||||
| Missing | Severe Hypocapnia | Mild Hypocapnia | Normocapnia | Mild Hypercapnia | Severe Hypercapnia | ||||||||
| (n = 70) | (n = 15) | (n = 79) | (n = 111) | (n = 76) | (n = 256) | ||||||||
| Male | 51 | (72.9) | 14 | (93.3) | 64 | (81.0) | 84 | (75.7) | 54 | (71.1) | 186 | (72.7) | 0.337 |
| Age, years | 65 | (50–72) | 69 | (56–81) | 67 | (56–74) | 63 | (54–72) | 63 | (49–72) | 67 | (56–79) | 0.029 |
| Initial cardiac rhythm | <0.001 | ||||||||||||
| VF/pVT | 29 | (41.4) | 8 | (53.3) | 42 | (53.2) | 47 | (42.3) | 37 | (48.7) | 62 | (24.2) | |
| PEA | 13 | (18.6) | 3 | (20.0) | 11 | (13.9) | 12 | (10.8) | 10 | (13.2) | 79 | (30.9) | |
| Asystole | 7 | (10.0) | 0 | 0.0 | 6 | (7.6) | 12 | (10.8) | 5 | (6.6) | 56 | (21.9) | |
| Other | 6 | (8.6) | 2 | (13.3) | 6 | (7.6) | 11 | (9.9) | 6 | (7.9) | 14 | (5.5) | |
| Witnessed arrest | 42 | (60.0) | 11 | (73.3) | 49 | (62.0) | 65 | (58.6) | 49 | (64.5) | 158 | (61.7) | 0.629 |
| Bystander performed CPR | 22 | (31.4) | 7 | (46.7) | 34 | (43.0) | 40 | (36.0) | 25 | (32.9) | 89 | (34.8) | 0.577 |
| CPR duration, min | 28 | (13–50) | 13 | (7–51) | 11 | (5–26) | 14 | (6–34) | 13 | (6–26) | 23 | (13–32) | <0.001 |
| CPR > 10min | 43 | (61.4) | 7 | (46.7) | 31 | (39.2) | 46 | (41.4) | 33 | (43.4) | 167 | (65.2) | <0.001 |
| GCS score at hospital arrival | 3 | (3–3) | 3 | (3–3) | 3 | (3–3) | 3 | (3–4) | 3 | (3–3) | 3 | (3–3) | <0.001 |
| 1-month poor neurologic status a | 45 | (64.3) | 8 | (53.3) | 34 | (43.0) | 53 | (47.7) | 41 | (53.9) | 215 | (84.0) | <0.001 |
| 1-month mortality | 28 | (40.0) | 5 | (33.3) | 22 | (27.8) | 21 | (18.9) | 26 | (34.2) | 125 | (48.8) | <0.001 |
Values are presented as n (%) or median (interquartile range: quartile 1–quartile 3). CPR, cardiopulmonary resuscitation; GCS, Glasgow coma scale; PEA, pulseless electric activity; VF, ventricular fibrillation; pVT, pulseless ventricular tachycardia. a Poor neurologic status defined as Cerebral Performance Category ≥ 3.