Table 1.

Criteria of Success or Failure of Spontaneous Breathing Trial (SBT).

Successful Spontaneous Breathing Trials	Failure of a Spontaneous Breathing Trial
◾▪ Respiratory rate < 35 breaths/min ◾▪ Heart rate < 140/min or heart rate variability of > 20% ◾▪ Arterial oxygen saturation > 90% or PaO2 > 60 mmHg on FiO2 < 40% ◾▪ 80 < Systolic blood pressure < 180 mmHg or < 20% change from baseline ◾▪ No signs of increased work of breathing or distress ◾▪ Good tolerance to spontaneous breathing trial	◾▪ Respiratory rate > 35 breaths/min ◾▪ Use of accessory muscles ◾Dyspnea ◾▪ Asynchronous movement of the abdomen and rib cage ◾▪ SpO2 < 90% ◾▪ Heart rate> 140/min or sustained 20% increase in heart rate ◾▪ Systolic blood pressure > 180 mmHg and diastolic > 90 mmHg ◾Anxiety ◾▪ Diaphoresis