Physiologic and Clinical Effect of High-flow Oxygen Therapy in Tracheostomized Patients With Prolonged Mechanical Ventilation Undergoing Weaning Trials

This study is aimed at patients who have been admitted to the respiratory care center of this hospital who meet the PMV conditions (defined as continuous use of the ventilator for at least ten days) who are about to receive the ventilator out of training. After obtaining the explanatory consent, they will undergo continuous complete Before and after spontaneous breathing training, collect various relevant physiological data of lung volume and ventilation perfusion distribution, and analyze and predict the correlation of ventilator detachment.