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Table 2 Ventilatory pattern and respiratory mechanics at enrollment

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 336.5 ± 158.3 299.5 ± 213.4 NS
   f, breaths/min 26.1 ± 7.5 32.4 ± 5.2 0.01
   f/VT 109.4 ± 74.5 173.9 ± 103.4 NS
Respiratory mechanics    
   CLdyn, L/cm H2O 0.049 ± 0.032 0.051 ± 0.035 NS
   RL, cm H2O/L per s 13.4 ± 9.0 12.9 ± 9.4 NS
   PEEPi,dyn, cm H2O 1.93 ± 1.36 2.7 ± 3.1 NS
Inspiratory muscle function    
   MIP, cm H2O 45.2 ± 19.5 32.7 ± 18.2 NS
   Pdimax, cm H2O 34.9 ± 18.9 25.4 ± 17.3 NS
   Pdisw/Pdimax, percentage 36.1 ± 15.8 54.4 ± 25.5 0.02
   PTPdi/min, cm H2O/s 235.8 ± 126.9 268.0 ± 234.8 NS
   TTdi 0.13 ± 0.065 0.21 ± 0.12 0.02
  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.