Table 1 Baseline characteristics of Out Of Hospital Cardiac Arrest (OHCA) patients

Yes, n = 88

No, n = 373

P-value

Male

55 (62.5%)

254 (68.1%)

0.379

Age, median (IQR)

59 (48, 70)

59 (46, 72)

0.668

Presumed cause of cardiac arrest

 Undetermined

20 (22.7%)

116 (31.1%)

0.156

 Myocardial infarction

18 (20.4%)

43 (11.5%)

0.049

 Electrolyte abnormalities

13 (14.8%)

53 (14.2%)

1.000

 Respiratory problem

14 (15.9%)

25 (6.7%)

0.010

 Other cardiac

6 (6.8%)

4 (1.1%)

0.005

 Major trauma

4 (4.5%)

84 (22.5%)

< 0.001

 Sepsis

3 (3.4%)

5 (1.3%)

0.182

 Stroke

3 (3.4%)

5 (1.3%)

0.182

 Pulmonary embolism

2 (2.3%)

8 (2.1%)

1.000

 Other causes

7 (8.0%)

29 (7.8%)

1.000

Mode of arrival

0.003

 EMS

45/81 (55.6%)

259/361 (71.7%)

 Private transport

30/81 (37.0%)

69/361(19.1%)

 During inter-hospital transfer

6/81 (7.4%)

33/361(9.1%)

Initial rhythm

0.029

 Asystole

23/81 (28.4%)

136/292 (46.6%)

 PEA

35/81 (43.2%)

99/292 (33.9%)

 VT/VF

23/81 (28.4%)

57/292 (19.5%)

BUN, mg/dL, median (IQR)

20 (13, 39)

15 (11, 27)

0.010

Creatinine, mg/dL, median (IQR)

1.42

(1.06, 2.60)

1.32

(1.00, 1.88)

0.337

Bicarbonate, mmol/L, median (IQR)

15.4

(12.4, 18.2)

13.2

(9.0, 17.0)

0.002

Potassium, mmol/L, median (IQR)

4.75

(4.07, 5.40)

5.20

(4.20, 6.50)

0.002

Sodium, mmol/L, median (IQR)

140 (137, 143)

140 (137, 144)

0.179

Resuscitation outcomes

 Sustain ROSC

88 (100%)

130 (34.9%)

< 0.001

 Survival to admission

88 (100%)

126 (33.8%)

< 0.001

 AMA discharge

72 (81.8%)

0 (0%)

< 0.001