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Table 3 Ventilatory pattern and respiratory mechanics at the end of the study

From: Determinants of weaning success in patients with prolonged mechanical ventilation

  Successful weaning group
(n = 16)
Failed weaning group
(n = 14)
P value
Ventilatory pattern    
   VT, mL 385.8 ± 132.2 289.3 ± 138.4 NS
   f, breaths/min 22.6 ± 6.0 27.4 ± 7.3 NS
   f/VT 74.1 ± 44.0 148.2 ± 121.4 0.03
Respiratory mechanics    
   CLdyn, L/cm H2O 0.067 ± 0.033 0.049 ± 0.024 NS
   RL, cm H2O/L per s 8.8 ± 5.8 14.4 ± 14.2 NS
   PEEPi,dyn, cm H2O 1.5 ± 1.0 1.7 ± 1.66 NS
Inspiratory muscle function    
   MIP, cm H2O 57.3 ± 18.2 38.6 ± 13.5 0.001
   Pdimax, cm H2O 43.0 ± 20.0 27.7 ± 12.5 0.01
   Pdisw/Pdimax, percentage 23.1 ± 7.9 42.5 ± 22.9 0.003
   PTPdi/min, cm H2O/s 194.1 ± 84.8 216.2 ± 136.8 NS
   TTdi 0.08 ± 0.029 0.14 ± 0.054 0.009
  1. CLdyn, dynamic lung compliance; f, spontaneous breathing frequency; MIP, maximum inspiratory pressure; NS, not significant; Pdimax, maximum transdiaphragmatic pressure; Pdisw, tidal diaphragmatic pressure; PEEPi,dyn, dynamic intrinsic positive end-expiratory pressure; PTPdi/min, pressure time product of the diaphragm per minute; RL, pulmonary resistance; TTdi, tension-time index of diaphragm; VT, tidal volume.