Table 1 Ventilation characteristics at different compression:ventilation ratios, continuous chest compressions with asynchronous ventilation; and ventilation rates

Continuous chest compressions with asynchronous ventilation

39 (39–39)

<0.001

19.7 (18.8-21.1)

0.002

5.6 (5.4-6.0)

0.002

777 (735–836)

<0.001

221 (210–239)

<0.001

0.52 (0.49-0.58)

0.427

C:V = 3:1 120 events per minute

30 (29–30)

22.3 (21.9-23.8)

6.4 (6.3-6.8)

668 (642–697)

191 (183–199)

0.50 (0.48-0.55)

C:V 9:3 120 events per minute

28 (28–30)

0.057

17.1 (16.5-17.1)

<0.001

4.9 (4.8-5.1)

<0.001

490 (468–506)

<0.001

140 (134–144)

0.002

0.33 (0.33-0.34)

<0.001

C:V 15:2 120 events per minute

14 (13–15)

<0.001

19.1 (19.0-19.9)

<0.001

5.5 (5.4-5.7)

<0.001

268 (261–289)

<0.001

77 (74–83)

<0.001

0.33 (0.32-0.34)

0.001

Ventilations only 40 per minute

40 (40–40)

<0.001

19.5 (18.8-19.9)

<0.001

5.6 (5.4-5.7)

<0.001

760 (734–775)

<0.001

217 (210–221)

<0.001

0.59 (0.57-0.71)

0.003

Ventilations only 60 per minute

58 (58–59)

<0.001

17.4 (16.8-17.8)

<0.001

5.0(4.8-5.1)

<0.001

1013 (973–1028)

<0.001

289 (278–294)

<0.001

0.56 (0.53-0.60)

0.049

Ventilations only 120 per minute

118 (117–118)

<0.001

13.1 (13.1-13.6)

<0.001

3.8 (3.7-3.9)

<0.001

1544 (1525–1595)

<0.001

441 (436–456)

<0.001

0.24 (0.24-0.25)

<0.001