Table 1.

Type of spontaneous breathing trial and definition of extubation failure

Variable	Number of studies (%)
Spontaneous breathing trial
T piece	15 (22.4%)
Low pressure support with zero-end expiratory pressure	6 (9.0%)
Continuous positive airway pressure	3 (4.5%)
Other	33 (49.3%)
Not available	10 (14.8%)
Duration of SBT
30 min	12 (17.9%)
60 min	8 (11.9%)
120 min	13 (19.4%)
Variable*	21 (31.3%)
Not available	12 (17.9%)
Definition of SBT failure
Respiratory rate	43 (64.2%)
Increased breathing work or distress signs	31 (46.9%)
Arterial oxygen saturation	39 (58.2%)
PaO2	8 (11.9%)
PaCO2	10 (14.9%)
Tidal volume or minute ventilation or RSBI	11 (16.4%)
Heart rate	36 (53.7%)
Arterial pressure or introduction of vasopressive drug	36 (53.7%)
Neurological criteria	38 (56.7%)
Not available	20 (29.9%)
Definition of extubation failure
Death or reintubation
Within 24 h	4 (6.0%)
Within 48 h	30 (44.8%)
Within 72 h	14 (20.9%)
Within 7 days	5 (7.5%)
At any time until discharge or death	4 (6.0%)
Reintubation or curative non-invasive mechanical ventilation	10 (14.9%)

SBT spontaneous breathing trial, PaO2 partial pressure of oxygen, PaCO2 partial pressure of carbon dioxide, RSBI Rapid Shallow Breathing Index, * from 30 min to 12 h