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Table 1 Patient characteristics

From: Predictive accuracy of biomarkers for survival among cardiac arrest patients with hypothermia: a prospective observational cohort study in Japan

Variables

Total

(N = 754)

Baseline characteristics

Sex (Men)

448 (59.4%)

Age (years)

75 [64–84]

 16–64

191 (25.3%)

 65–74

181 (24%)

 ≥75

382 (50.7%)

Pre-hospital information

 Bystander witness

208 (27.6%)

 Bystander CPR

276 (36.6%)

 Shockable on initial rhythm

62 (8.22%)

 Advanced airway

375 (49.7%)

In-hospital information

 Body temperature

30 [26.4–31.3]

Measurement site

 Rectal

151 (20%)

 Bladder

95 (12.6%)

 Tympanic

49 (6.5%)

 Other/unknown

459 (60.9%)

Cardiac rhythm on hospital arrival

 ROSC

32 (4.24%)

 Shockable

57 (7.56%)

 PEA

128 (17%)

 Asystole

537 (71.2%)

 ECMO implementation

59 (7.82%)

 Before ROSC

48

 ROSC after hospital arrival

157 (20.8%)

Time course (min)

 E-call to hospital arrival

34 [29–43]

 E-call to blood test

41 [35–52]

 E-call to ECMO

70 [51.8–88]

 E-call to ROSC after arrival

51 [40–85]

Blood test on hospital arrival

 pH

6.8 [6.63–6.97]

 (Missing)

50 (6.6%)

 Lactate (mg/dL)

135 [90.9–180]

 (Missing)

53 (7.0%)

 Potassium (mmol/L)

6.6 [4.9–9.6]

 (Missing)

383 (50.8%)

Outcomes

 Admission to ICU or ward

152 (20.2%)

 Death in ER

602 (79.8%)

 1-month survival

44 (5.8%)

 1-month CPC1,2

24 (3.2%)

  1. Continuous variables are described as median [Interquartile range (IQR)]. Categorical variables are described as number (%). Shockable: ventricular fibrillation and pulseless ventricular tachycardia, CPR Cardiopulmonary resuscitation, E-call Emergency call for ambulance, ROSC Return of spontaneous circulation, PEA Pulseless electrical activity, ECMO Extracorporeal membrane oxygenation, ER Emergency room, CPC Cerebral performance category [17]