Table 4

Comparison of characteristics and values of PetCO2 between shockable and nonshockable initial rhythm for patients with cardiac arrest

Shockable (n = 304)

Nonshockable (n = 433)

P value


Age (years)

59.5 ± 11.9

60.1 ± 12.9

0.55

Arrival (min [min-max])

8.6 ± 4.5 (1–22)

9.9 ± 4.3 (2–29)

0.03

Initial PetCO2 (kPa [mmHg])

2.2 ± 1.3 (16.6 ± 9.8)

3.4 ± 2.4 (25.6 ± 18.1)

<0.001

1 minute PetCO2 (kPa [mmHg])

3.3 ± 1.4 (24.8 ± 10.5)

2.8 ± 1.5 (21.1 ± 11.3)

<0.001

Average PetCO2 (0 to 10 minutes; kPa [mmHg])

2.3 ± 1.1 (17.3 ± 8.3)

1.8 ± 1.2 (13.5 ± 0.9)

<0.001

10 minute PetCO2 (kPa [mmHg])

2.7 ± 1.3 (20.3 ± 10)

2.1 ± 1.3 (15.8 ± 10)

<0.001

11–15 minutes PetCO2 (kPa [mmHg])

2.5 ± 1.2 (18.8 ± 9.1)

1.9 ± 1.2 (14.3 ± 9.7)

<0.001

15 minutes PetCO2 (kPa [mmHg])

2.9 ± 1.5 (21.8 ± 11.3)

2.2 ± 1.4 (16.5 ± 10.5)

<0.001

20 minutes PetCO2 (kPa [mmHg])

3.3 ± 1.8 (24.8 ± 13.5)

2.4 ± 1.9 (18.1 ± 14.3)

<0.001

Max PetCO2 (kPa [mmHg])

4.2 ± 2.1 (31.6 ± 15.8)

3.3 ± 2.1 (24.8 ± 15.8)

<0.001

Final PetCO2 (kPa [mmHg])

2.9 ± 1.5 (21.8 ± 11.3)

2.1 ± 1.5 (15.8 ± 11.3)

<0.001


'Shockable' was defined as ventricular fibrillation or tachycardia and 'nonshockable' was defined as asystole or pulseless electrical activity. Unless otherwise stated, values are expressed as mean ± standard deviation. PetCO2, partial pressure of end-tidal carbon dioxide.

Kolar et al. Critical Care 2008 12:R115   doi:10.1186/cc7009

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