Table 3 Univariate analysis of patients’ demographics and ECG findings compared with status of coronary arteries

Age

Mean ± SD

65 ± 9

47 ± 16

<0.001

Gender (Male)

n (%)

22 (100)

20 (80)

0.0518

Past history

HT

n (%)

9 (41)

8 (32)

0.5583

HL

n (%)

4 (18)

3 (12)

0.6902

DM

n (%)

6 (27)

0 (0)

0.0069

ACS

n (%)

6 (27)

0 (0)

0.0069

PCI

n (%)

5 (23)

0 (0)

0.0172

CABG

n (%)

3 (14)

0 (0)

0.0950

Heart failure

n (%)

2 (9)

4 (16)

0.6701

Arrhythmia

n (%)

3 (14)

10 (40)

0.0561

Prehospital status

Chest pain before arrest

n (%)

2 (9)

2 (8)

1.0000

VT/VF on EMT arrival

n (%)

21

23

1.0000

ECG findings

HR

Mean ± SD

96 ± 29

84 ± 23

0.1393

Axis deviation (RAD or LAD)

n (%)

0 (0)

3 (12)

0.8368

AF or AFL

n (%)

7 (32)

6 (24)

0.7450

Junctional rhythm

n (%)

1 (5)

3 (12)

0.6115

P wave

n (%)

14 (64)

21 (84)

0.1800

Abnormal P wave

n (%)

7 (32)

4 (16)

0.3027

Abnormal PQ interval

n (%)

9 (410)

9 (36)

0.7712

Prolonged PQ

n (%)

1 (5)

5 (20)

0.1936

Any abnormal QRS

n (%)

16 (73)

19 (76)

1.0000

Wide QRS

n (%)

1 (5)

3 (12)

0.6115

QRS width (ms)

Mean ± SD

98 ± 32

91 ± 25

0.4028

RBBB

n (%)

6 (27)

6 (24)

1.0000

LBBB (LAH or LPH)

n (%)

1 (5)

4 (16)

0.3525

Any BBB

n (%)

7 (32)

8 (32)

1.0000

Bifascicular block

n (%)

1 (5)

2 (8)

1.0000

Q wave

n (%)

12 (55)

9 (36)

0.2481

Any abnormal ST segment change

n (%)

22 (100)

17 (68)

0.0045

ST segment elevation

n (%)

14 (64)

7 (28)

0.0200

ST segment depression without reciprocal change

n (%)

7 (32)

10 (40)

0.7617

Any ST segment depression

n (%)

16 (73)

13 (52)

0.2293

Prolonged QT interval

n (%)

12 (55)

14 (56)

1.0000

Invert (coronary or negative or flat)

n (%)

5 (23)

1 (4)

0.0848

Abnormal U wave

n (%)

4 (18)

4 (16)

1.0000

Expert opinions^a

Cardiologist # 1 assessment of ECG

n (%)

16 (73)

20 (80)

0.0004

Cardiologist # 2 assessment of ECG

n (%)

16 (59)

21 (84)

0.0029