Young (n = 32)

Old (n = 38)

p

Male

19 (59.4%)

14 (36.8%)

0.060

Age (years)

46.7 ± 9.3

87.2 ± 3.4

<0.001

Witnessed arrest

25 (78.1%)

23 (60.5%)

0.077

Bystander-initiated resuscitation

21 (65.6%)

21 (55.3%)

0.347

Initial shockable rhythm

16 (50.0%)

8 (21.1%)

0.014

First body temperature (˚C)

35.3 ± 1.4

35.2 ± 1.4

0.992

First pH

7.15 ± 0.25

7.14 ± 0.20

0.688

First pO₂ (mmHg)

203.2 ± 167.1

193.1 ± 162.5

0.925

First pCO₂ (mmHg)

53.0 ± 26.1

50.7 ± 21.8

0.468

First lactate (mmol/l)

11.9 ± 18.4

8.0 ± 4.3

0.117

Creatine kinase (CK) (U/l)

373.4 ± 540.4

291.2 ± 535.2

0.653

Troponin I (ng/ml)

2.3 ± 9.4

2.6 ± 8.8

0.865

Myocardial infarction

11 (34.4%)

8 (21.1%)

0.581

STEMI

8 (25.0%)

3 (7.9%)

NSTEMI

3 (9.4%)

5 (13.2%)

Coronary angiography

23 (71.9%)

7 (18.4%)

<0.001

Percutaneous coronary intervention

15 (46.9%)

5 (13.2%)

0.003

Mild therapeutic hypothermia

25 (78.1%)

6 (15.8%)

<0.001

Discharged alive

21 (65.6%)

8 (21.1%)

<0.001