Table 1 Demographic and clinical characteristics of the study patients according to electroencephalography timing
Characteristics | Total (N = 489) | Patients with EEG < 72 h (N = 353) | Patients with EEG of 72 h to 7 days (N = 136) | P value |
|---|---|---|---|---|
Age, years | 58.0 (46.0–69.0) | 58.0 (46.0–69.0) | 57.0 (46.3–67.0) | 0.515 |
Male | 341 (69.7%) | 251 (71.1%) | 90 (66.2%) | 0.288 |
Previous medical history | ||||
Hypertension | 171 (35.0%) | 127 (36.0%) | 44 (32.4%) | 0.451 |
Diabetes mellitus | 99 (20.2%) | 78 (22.1%) | 21 (15.4%) | 0.101 |
Acute myocardial infarction | 25 (5.1%) | 16 (4.5%) | 9 (6.6%) | 0.348 |
Congestive heart failure | 18 (3.7%) | 13 (3.7%) | 5 (3.7%) | 0.997 |
Chronic kidney disease | 38 (7.8%) | 30 (8.5%) | 8 (5.9%) | 0.333 |
Cardiac arrest characteristics | ||||
Witnessed | 313 (64.0%) | 228 (64.6%) | 85 (62.5%) | 0.666 |
Bystander CPR | 296 (60.5%) | 212 (60.1%) | 84 (61.8%) | 0.729 |
Initial shockable rhythm | 169 (34.6%) | 127 (36.0%) | 42 (30.9%) | 0.288 |
No flow time, min | 1.0 (0.0–6.0) | 1.0 (0.0–6.0) | 1.0 (0.0–7.0) | 0.935 |
Resuscitation duration, min | 24.0 (13.5–36.0) | 24.0 (13.0–37.5) | 24.0 (14.0–32.0) | 0.48 |
Time from ROSC to TTM initiation, hours | 3.2 (2.0–4.7) | 3.2 (1.9–4.6) | 3.3 (2.2–4.7) | 0.599 |
Target temperature | 0.049 | |||
33 °C | 273 (55.8%) | 185 (52.4%) | 88 (64.7%) | |
34–35 °C | 160 (32.7%) | 124 (35.1%) | 36 (26.5%) | |
36 °C | 56 (11.5%) | 44 (12.5%) | 12 (8.8%) | |
Time from ROSC to EEG examination, hours | 46.6 (23.9–73.9) | 31.5 (20.0–52.0) | 90.8 (77.8–106.1) | < 0.001 |
Poor neurological outcome at 1 month | 341 (69.7%) | 243 (68.8%) | 98 (72.1%) | 0.487 |
Death at 1 month | 231 (47.2%) | 166 (47.0%) | 65 (47.8%) | 0.879 |
Poor neurological outcome at 6 months | 335 (69.4%), N = 483 | 237 (68.3%), N = 347 | 98 (72.1%), N = 136 | 0.420 |
Death at 6 months | 276 (57.1%), N = 483 | 197 (56.8%), N = 347 | 79 (58.1%), N = 136 | 0.793 |