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Table 2 Respiratory variables during the five different weaning tests and 20 minutes after extubation

From: Spontaneous breathing trial and post-extubation work of breathing in morbidly obese critically ill patients

  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
  1. 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