Table 2 Delta values of parameters between the initial and second arterial blood gas analysis.

From: Dynamic changes in arterial blood gas during cardiopulmonary resuscitation in out-of-hospital cardiac arrest

Delta values of arterial blood gas parameters†

Sustained ROSC (n = 13)

No ROSC (n = 67)

p value

Analysis time difference (mins)

9 (8–10)

9 (7–11)

0.798

ΔpH

− 0.09 (− 0.13 to − 0.04)

− 0.01 (− 0.08 to 0.09)

0.038

ΔpaO2 (mmHg)

90.2 (51.2–122.7)

16.5 (− 0.4 to 42.2)

< 0.001

ΔpaCO2 (mmHg)

0.0 (− 22.7 to 10.6)

3.4 (− 16.8 to 21.3)

0.485

ΔLactic acid (mmol/L)

1.1 (− 0.8 to 2.9)

0.1 (− 0.7 to 1.4)

0.497

ΔHCO3 (mmol/L)

− 2.2 (− 6.7 to − 0.7)

− 0.7 (− 2.8 to 5.2)

0.019

ΔBE (mmol/L)

− 3.6 (− 7.4 to − 2.5)

− 4.0 (− 4.1 to 5.8)

0.007

  1. BE base excess, HCO3 bicarbonate, paO2 partial pressure of arterial oxygen, paCO2 partial pressure of arterial carbon dioxide, ROSC return of spontaneous circulation.
  2. †Variables are expressed as median with interquartile ranges.
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