Table 1

Group analysis of peak inflating pressure (PIP) and tidal volume in subjects at low and normal compliance during the first and second 60 s of combined chest compressions and FMV, and during FMV only

First minuteSecond minute
CC/FMVPIP (cm H2O)
30 s		TV (mL/cm H2O)
30 s		PIP(cm H2O)
30 s		TV (mL/cm H2O)
30 s
Low compliance37.5±6.2
(median 40)
range 18–45		3.8±1.76
(median 3)
range 2–10		38±4.7
(median 40)
range 18–45		4.0±2.1
(median 3)
range 2–10
Normal compliance36.2±6.6
(median 38)
range 18–45		13.8±6.2*
(median 15)
range 3–30		35.4±6.9
(median 38)
range 20–45		13.1±5.0*
(median 15)
range 4–20
FMV only
Low compliance40.5±5
(median 38)
range 18–45		3.7±1.27
(median 3)
range 2–8
Normal compliance33.4±8.5*
(median 35)
range 20–45		16.2±3.56*
(median 16)
range 6–22

  • *p=0.00005 (difference between tidal volume at low vs normal compliance).

  • CC, chest compressions; FMV, face mask ventilation; TV, tidal volume.