Table 1 Criteria for initiating SBT
(1) Oxygenation | |
 SpO2 >90% under FIO2≤0.5 and PEEP≤8 cmH2O | |
(2) Circulation | |
 No acute myocardial ischemia or serious arrhythmia | |
 Heart rate <140 bpm | |
 DOA ≦ 5μg/kg/min, DOB ≦ 5μg/kg/min, NAD ≦ 0.05μg/kg/min | |
(3) Ventilation | |
 Tidal volume>5 ml/IBW | |
 Respiratory minute volume<15 L/min | |
 Rapid shallow breathing index < 105/min/L | |
 No respiratory acidosis (pH<7.25) | |
 Normal breathing pattern | |
 No respiratory effort | |
(4) General condition | |
 No serious electrolyte disorders | |
 No severe anemia | |
 No serious fluid overload |