Table I.

Readiness criteria for the spontaneous breathing trial.

1	Improvement in underlying conditions
2	Adequate oxygenation, indicated by PaO2 >60 mmHg at FiO2 ≤0.4 with an extrinsic positive end-expiratory pressure <8 cm H2O
3	Cardiovascular stability (absence of active myocardial ischemia, absence of vasopressor use or <5 mg/kg/min dopamine or dobutamine; heart rate <130 beats/min)
4	Body temperature <38°C
5	Hemoglobin >8 g/dl
6	Awake or easily arousable
7	Adequate coughing during suctioning and did not require suctioning more often than every 2 h
8	Blood pH ≥7.3

PaO₂, partial pressure of oxygen in arterial blood; FiO₂, fraction of inspired oxygen.