| |
PSV
|
PSV
|
PSV
|
PSV
|
T piece
|
After extubation
|
|---|
|
+7 cmH2O PEEP
|
0 cmH2O PEEP
|
+7 cmH2O PEEP
|
0 cmH2O PEEP
|
|---|
|
+7 cmH2O
|
+7 cmH2O
|
0 cmH2O
|
0 cmH2O
|
|---|
|
Ti, s
|
0.90 ± 0.2
|
0.93 ± 0.23
|
0.82 ± 0.24
|
0.84 ± 0.28
|
0.81 ± 0.3
|
0.89 ± 0.43
|
|
Ttot, s
|
2.6 ± 0.8
|
2.4 ± 0.6
|
2.2 ± 0.6
|
2.1 ± 0.6
|
2.1 ± 0.6
|
2.2 ± 0.8
|
|
Ti/Ttot, %
|
35.7 ± 3.6
|
38.7 ± 4.2
|
37.8 ± 4.2
|
39.3 ± 4.4
|
38.7 ± 4.7
|
40.8 ± 4.3
|
|
VT, L
|
0.43 ± 0.12
|
0.41 ± 0.1
|
0.38 ± 0.1
|
0.37 ± 0.1
|
0.35 ± 0.1
|
0.36 ± 0.1
|
|
RR, breaths/minute
|
25 ± 6
|
26 ± 7
|
29 ± 6
|
30 ± 8
|
31 ± 7
|
30 ± 8
|
|
RR/VT, minutes/mL
|
64.5 ± 26.8
|
69.7 ± 25.0
|
83.1 ± 34.4
|
87.8 ± 36.4
|
94.7 ± 38.1
|
88.6 ± 34
|
|
VE, L/minute
|
10.3 ± 2.4
|
10.41 ± 2.9
|
10.8 ± 2.6
|
10.8 ± 3.3
|
10.5 ± 3.2
|
11.2 ± 4.4
|
|
PEEPi, cmH2O
|
1.1 ± 0.9
|
1.7 ± 1.2
|
2.5 ± 2.3
|
2.6 ± 2.2
|
2.4 ± 2.6
|
2.2 ± 2.3
|
- There were no statistically significant differences between respiratory variables among the successive tests. Abbreviations: PSV pressure support ventilation; PEEP positive end-expiratory pressure; PEEPi intrinsic positive end-expiratory pressure; RR respiratory rate; Ti inspiratory time; Ttot total respiratory time; VE volume per minute; V
T
tidal volume
