Table 1 Baseline characteristics

Age, mean ± SD

54.4± 20.6

68.9 ± 14.5

p=< .001

Sex male, %

53.42

57.2

p=.39

Risk factors

Yes, %

 Diabetes

11.6

19.6

p=.01

 Hypertension

48.9

69.5

p=< .001

 Ex-/smoker

25.3

23.6

p=.68

 Familial disposition

13.2

13.8

p=.90

 Hypercholesterolaemia

22.8

36.8

p=.001

Antiplatelet therapy at ED admission

Yes, %

 ASA

23.2

25.5

p=.54

 ADP-receptor antagonist

6.7

2.6

p=.04

 DAPT

4.4

1.7

p=.09

 VKA

4.8

16.7

p< .001

 NOAC

8.2

30.9

p< .001

 Heparin

0.3

0.9

p=.58

Further medication at ED admission

yes %

 Statin

22.6

31.6

p=.02

 ACE-inhibitor

17.5

32.6

p< .001

 Sartan

18.6

22.2

p=.33

 Calcium antagonist

15.7

16.2

p=.91

 Diuretic

21.3

42.2

p< .001

 Beta-blocker

33.7

62.3

p< .001

 Amiodarone

2.2

2.6

p=.78

 Flecainide

0.3

3.0

p=.01

 Other antiarrhythmics

0.3

2.6

p=.05

Coexisting conditions at ED admission

Yes, %

 History of stroke

6.2

12.0

P=.02

 History of TIA

0

0.4

p=.42

 History of CAD

21.8

28.5

p=.07

 History of CA

29.3

62.7

p< .001

 History of DCM

3.4

4.2

p=.66

Ejection fraction

Yes, %

 Normal EF ≥55%

75.0

66.3

p=.09

 Mildly reduced EF 45–54%

8.9

14.8

p=.13

 Moderately reduced EF 30–44%

10.7

12.4

p=.73

 Severely reduced EF < 30%

5.4

6.5

p=.82

Vital signs at ED admission

Yes, %/mean ± SD

 Temperature

36.8 ± 0.5

36.8 ± 0.6

p=.30

 Blood pressure

 Hypotensive < 100/60 mmHg

2.5

224

309

5.3

224

309

p=.11

 Normotensive up to 139/89 mmHg

36.5

46.7

p=.02

 Hypertensive ≥ 140/90 mmHg

61.0

48.0

p=.003

 Heart rate

 Bradycardia < 50 bpm

2.3

4.5

p=.21

 Normal HR 50-99 bpm

80.8

29.9

p< .001

 Tachycardia > 99 bpm

16.9

65.6

p< .001

Laboratory parameters at ED admission

Yes (%)/mean ± SD

 Troponin > 0.03 ng/ml

42 (14.58)

47 (22.60)

p=.02

 CK > 169 U/l

55 (19.23)

50 (23.70)

p=.27

 CK-MB > 23 U/l

18 (6.38)

21 (10.10)

p=.18

 ProBNP pg/ml

7960.3±9723.6

2792.0±2549.2

p=.39