We aimed to verify the potencial role of bedside lung ultrasound findings of critically ill patients candidates to liberation from mechanical ventilation in predicting weaning outcomes. The analysis will be taken in two times: immediately before and at the and spontaneous breathing trial.

Inclusion Criteria:

• Invasive mechanical ventilation > 24 hours
• Eligibility to weaning from mechanical ventilation

Exclusion Criteria:

• Tracheostomy

Mechanical ventilation patients in a mixed intensive care unit