Table 2.
Individual results of the spontaneous breathing trial (SBT)
| n = 15 | Time taken to fulfil the first failure criterion (min) | First failure criterion fulfilled | Duration of SBT (min) | Type of failure criteria fulfilled |
|---|---|---|---|---|
| 1 | 25 | Clinical criteria | 25 | PaCO2, clinical criteria |
| 2 | 30 | PaCO2 | 30 | PaCO2, pH |
| 3 | 25 | RSBI | 66 | RSBI |
| 4 | 8 | RSBI | 11 | PaCO2, RSBI, clinical criteria |
| 5 | 6 | Clinical criteria | 6 | Clinical criteria, PaCO2, SpO2 |
| 6 | 7 | RSBI | 13 | RSBI |
| 7 | 4 | RSBI | >120 | RSBI, HR |
| 8 | 0 | RSBI | >120 | PaCO2, RSBI, RR sys, clinical criteria |
| 9 | 90 | RR sys | >120 | RR sys |
| 10 | 24 | Clinical criteria | 24 | Clinical criteria |
| 11 | >120 | None | >120 | None |
| 12 | 0 | RSBI | 30 | PaCO2, RSBI, clinical criteria |
| 13 | 0 | RSBI | 21 | pH, SpO2, RSBI, fR |
| 14 | 50 | PaCO2 | 50 | PaCO2, clinical criteria |
| 15 | 0 | RSBI | >120 | RSBI, fR |
Clinical criteria = agitation and anxiety/depressed mental status/diaphoresis/cyanosis/evidence of increasing effort/increased accessory muscle activity/facial signs of distress/dyspnoea [3]
fR respiratory frequency >35 breaths/min or increased by ≥50%, HR heart rate >140 beats/min or increased by ≥20%, PaCO2 arterial partial pressure of oxygen >50 mm Hg, or an increase of >8 mm Hg, pH pH-value <7.32 or a decrease in pH of ≥0.07 pH units, RR sys systolic blood pressure >180 mm Hg or increased by ≥20% or <90 mm Hg, RSBI rapid shallow breathing index >105 breaths/min/l, SpO2 peripheral oxygen saturation <90%