Table 2

Effects on the delay time and inspiratory trigger pressure of tube compensation (TC) of the two ventilators

Delay time (ms)

Inspiratory trigger pressure (cmH₂O)

0% TC

100% TC

0% TC

100% TC

Airway pressure

NPB840

61 ± 11

77 ± 5

4.84 ± 0.10

4.84 ± 0.10

DE4

60 ± 6

58 ± 5

5.89 ± 0.34

5.89 ± 0.34

Tracheal pressure

NPB840

91 ± 31

108 ± 17

6.52 ± 0.08

7.06 ± 0.05

DE4

108 ± 43

95 ± 20

7.11 ± 0.06

7.14 ± 0.12

Pleural pressure

NPB840

139 ± 109

121 ± 22

7.39 ± 0.06

8.19 ± 0.02

DE4

176 ± 131

110 ± 25

8.14 ± 0.02

8.19 ± 0.14

All values presented as mean ± standard deviation of three breaths (ml). DE4, Dräger Evita 4 ventilator; NPB840, Nellcor Puritan-Bennett 840 ventilator. The delay time did not differ significantly according to the inspiratory flow of simulated spontaneous breathings, and combined data are presented. An inspiratory trigger pressure measured at airway opening of 60 l/min inspiratory flow is presented.

Maeda et al. Critical Care 2003 7:R92   doi:10.1186/cc2343