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Table 2 Breathing pattern and ventilator functioning in automatic tube compensation and low-pressure support periods during spontaneous breathing trial

From: Low-pressure support vs automatic tube compensation during spontaneous breathing trial for weaning

 ATCLow PSP value
Tidal volume (l)0.35 (0.30; 0.45)0.35 (0.32; 0.50)0.22
Tidal volume (ml/kg predicted body weight)5.3 (4.5; 6.3)5.6 (4.7; 7.7)0.21
Respiratory rate (breaths/min)27 (21; 33)25 (21; 28)0.007
Minute ventilation (l/min)9.5 (7.4; 11.7)9.4 (8.3; 10.4)0.22
Respiratory rate/tidal volume ratio (breaths/min/l)77 (52; 105)70 (43; 88)0.048
Inspiratory time (s)0.95 (0.78; 1.11)0.88 (0.80; 1.05)0.79
Expiratory time (s)1.44 (1.10; 1.78)1.72 (1.36; 1.96)0.05
Inspiratory/expiratory time ratio (%)0.67 (0.54; 0.81)0.55 (0.49; 0.71)0.04
PEEP (cmH2O)5 (4; 5)5 (4–5)0.60
DPtrig (cmH2O)− 2 (− 3; − 1)− 2 (− 3; − 2)0.60
DTtrig (s)0.19 (0.12; 0.22)0.15 (0.13; 0.19)0.007
Maximal inspiratory pressure (cmH2O)8 (7; 8)12 (12–12)0.00006
Maximal inspiratory flow (l/s)1 (1; 1)1 (1; 1)0.18
  1. ATC automatic tube compensation, PS pressure support, PEEP positive end-expiratory pressure, DPtrig maximal depression in airway pressure from PEEP during activation of inspiratory trigger, DTtrig time delay between onset of inspiratory effort and return to baseline PEEP before inspiratory valve opening
  2. Values are median (1st; 3rd quartiles)