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Table 4 Comparison of characteristics and values of PetCO2 between shockable and nonshockable initial rhythm for patients with cardiac arrest

From: Partial pressure of end-tidal carbon dioxide successful predicts cardiopulmonary resuscitation in the field: a prospective observational study

  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
  1. '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.