Table 2– Monitored respiratory data and arterial blood gases of extubated patients during the last 15 min of the weaning period
ASVPSVp-value
Subjects n4039
PS level7 (6–8)7 (7–7)0.12
pH7.41 (7.35–7.45)7.39 (7.33–7.45)0.54
Pa,CO2 mmHg56 (51–64)57 (50–66)0.62
HCO3 mmol·L−136 (35–40)36 (29–40)0.6
Pa,O2/FI,O2288 (230–310)267 (230–297)0.46
V′E L·min−18.3 (7.4–9.1)8.4 (6.9–9.8)0.87
V′E mL·kg−1119 (101–148)126 (103–133)0.91
VT mL394 (333–489)424 (326–474)0.74
VT mL·kg−15.7 (5.3–6.3)5.4 (4.9–6.9)0.45
Respiratory rate breaths·min−122 (17–26)23 (20–27)0.43
RCexp s0.9 (0.7–1.1)0.8 (0.7–0.9)0.37
tE s1.9 (1.5–2.5)1.7 (1.4–2)0.16
tI s0.8 (0.7–1.2)0.9 (0.8–1)0.81
P0.1 cmH2O2.8 (1.1–3.9)2.3 (2–3.4)0.57
  • Data are presented as median (interquartile range), unless otherwise stated. ASV: adaptive support ventilation; PSV: pressure support ventilation; PS: pressure support; Pa,CO2: arterial carbon dioxide tension; Pa,O2/FI,O2: arterial oxygen tension/inspiratory oxygen fraction; V′E: minute ventilation; VT: tidal volume; RCexp: expiratory time constant; tE: expiratory time; tI: inspiratory time; P0.1: airway occlusion pressure at 0.1 s.