Prolonged mechanical ventilation will have many risks of hospital infection, lung damage, on the other hand, the treatment cost is expensive but still has the risk of causing death for the patient. Therefore, for patients on mechanical ventilation, the process of weaning from the ventilator needs to be quickly assessed so that the ventilator can be removed as soon as possible. This process needs to be considered right from the beginning of mechanical ventilation.

Weaning from a ventilator is the process of gradually reducing the support of the ventilator and gradually increasing the patient's natural breathing to achieve the target when removing the ventilator. This process can take place from several days to several weeks, even months. Weaning a patient from a ventilator when: the cause of ventilation has been treated, gas exchange is maintained with the lowest level of support (ability to breathe on your own < 30 breaths/minute)...

Patients are considered difficult to wean from mechanical ventilation if they fail the first spontaneous breathing trial (SBT) and require three SBTs or seven days to successfully achieve SBT. Up to 40% of patients on mechanical ventilation for acute illness in ICUs are difficult to wean from mechanical ventilation.