Factors predicting weaning success

PaO2 > 11kPa on FIO2 = 0.4 (PaO2/FIO2 ratio >27.5kPa)

Minute volume <12l/min Vital capacity >10ml/kg

Maximum inspiratory force (PImax) >20cmH2O Respiratory rate/tidal volume <100 Qs/Qt <15%

Dead space/tidal volume <60% Haemodynamic stability

A ratio of respiratory rate to tidal volume (f/VT, shallow breathing index) <v105 has been shown to have a 78%

positive predictive value for successful weaning.

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