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Table 1 Type of spontaneous breathing trial and definition of extubation failure

From: Prediction of extubation outcome in critically ill patients: a systematic review and meta-analysis

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%)

  1. 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