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Table 1 Patient characteristics and factors at resuscitation in cardiac arrest patients treated in a tertiary intensive care unit based on arterial oxygen levels

From: Prevalence and factors correlating with hyperoxia exposure following cardiac arrest – an observational single centre study

  All Not exposed to hyperoxia Hyperoxia exposure P-value
n = 119 n = 70 n = 49
Arrest location
OHCA 43% (51) 35% (18) 65% (33) <0,001
IHCA 40% (48) 79% (38) 21% (10)  
ICUCA 17% (20) 70% (14) 30% (6)  
Patient characteristics
Age 61 (49–74) 63 (52–72) 60 (48–75) 0,633
Smoking, 24% (29) 27% (19) 20% (10) 0,400
Obesity 11% (13) 13% (9) 8% (4) 0,419
Pulmonary disease 20% (24) 17% (12) 25% (12) 0,326
Coronary artery disease 36% (43) 41% (29) 29% (14) 0,151
Diabetes 20% (24) 21% (15) 19% (9) 0,723
Pre-arrest OPC 1 68% (81) 65% (45) 75% (36) 0,604
Resuscitation variables
Witnessed arrest
  No 19% (23) 17% (12) 22% (11) 0,471
  Yes 81% (96) 83% (58) 78% (38)  
Assumed cause of the arrest
  Cardiac 49% (58) 49% (34) 50% (24) 0,967
  Pulmonary/hypoxia 25% (29) 24% (17) 25% (12)  
  Other1 26% (31) 27% (19) 25% (12)  
Initial rhythm
  Ventricular fibrillation/Ventricular tachycardia 40% (47) 34% (24) 47% (23) 0,205
  Pulseless electrical activity 20% (24) 23% (16) 16% (8)  
  Asystole 37% (44) 37% (26) 37% (18)  
  Other 3% (4) 6% (4) 0%  
Median (IQR) delay to ROSC (min) 15 (5–28) 10 (5–20) 26 (12–33) <0,001
  No-flow 3 (0–10) 2 (0–5,5) 7 (0–11) 0,008
  Low-flow 10 (5–20) 7,5 (3–15) 16 (7–22,5) 0,001
  1. 1Cause of the arrest missing for 1 patient.