Background
Airway mucosa is the most important natural defense system in the body and is considered the first line of defense of the respiratory system [Pressure-controlled ventilation-volume guaranteed (PCV-VG) mode utilizes a decelerating flow and constant pressure to achieve volume control and pressure control. It has thus been widely used in clinical practice [To bridge this data gap, in this study, we used bronchial mucus transport velocity (BTV) to quantify mucociliary clearance [