Table 2 Factors associated with survival to hospital discharge in OHCA patients who presented at the ED

BUN ≥ 19.5

45/85 (52.9%)

129/359 (36%)

2.01 (1.25–3.24)

2.03 (1.15–3.59)

Bicarbonate ≥ 12.6

65/88 (73.9%)

197/373 (53%)

2.52 (1.53–4.31)

1.55 (0.85–2.89)

Potassium ≥ 5.1

31/88 (35.2%)

204/368 (55%)

0.44 (0.27 0.70)

0.35 (0.19–0.63)

Mode of arrival

 EMS

45/81 (55.6%)

259/362 (72%)

Reference

 Private transport

30/81 (37.0%)

70/362 (19%)

2.46 (1.44–4.19)

2.02 (1.10–3.70)

 During inter-hospital transfer

6/81 (7.4%)

33/362 (9.1%)

1.06 (0.39–2.54)

0.94 (0.32–2.44)

Initial rhythm

 Asystole

23/81 (28.4%)

136/292 (47%)

Reference

 PEA

35/81 (43.2%)

99/292 (34%)

2.08 (1.16–3.79)

1.67 (0.87–3.24)

 VT/VF

23/81 (28.4%)

57/292 (20%)

2.38 (1.23–4.61)

1.60 (0.77–3.32)