Table 2.
Indices used to predict success for weaning and ventilator discontinuation
| Index | Threshold values |
| Ventilatory drive | |
| Minute ventilation (VE) | <10 l/minute |
| P0.1/PImax | <0.3 |
| Respiratory muscle strength | |
| Maximum inspiratory pressure (PImax) | < -20 to -30 cmH2O |
| Ventilatory mechanics | |
| Tidal volume (VT) | >5 ml/kg |
| Breathing frequency (f) | <30–35 breaths/minute |
| Rapid shallow breathing (f/VT) | <105 breaths/minute/ml |
| Others | |
| Integrative index (CROP) | >13 ml/breaths/minute |
P0.1/PImax = ratio of airway occlusion pressure 0.1 s after the onset of inspiratory effort to PImax.