After setting the flow at 5 L/min and positive end-expiratory pressure (PEEP) at 0 cmH2O, the respiratory rate will be transiently decreased to achieve a prolonged expiration of 5-10 seconds to eliminate auto-PEEP. During two breaths, the change in the slope of the pressure-time curve will be observed. Airway Closure be detected as a change in the slope of the pressure-time curve. Airway Opening Pressure value, in cmH2O, will be identified on the pressure-volume curve using the cursor while the mechanical ventilator screen is frozen. Upon completion of this procedure, the ventilator settings will be returned to the patient's initial parameters.

After setting the flow at 5 Litres/minute and positive end-expiratory pressure (PEEP) at 0 cmH2O, the respiratory rate will be transiently decreased to achieve a prolonged expiration of 5-10 seconds to eliminate auto-PEEP. During two breaths, the change in the slope of the pressure-time curve will be observed. Airway Closure be detected as a change in the slope of the pressure-time curve. Airway Opening Pressure value, in cmH2O, will be identified on the pressure-volume curve using the cursor while the mechanical ventilator screen is frozen. Upon completion of this procedure, the ventilator settings will be returned to the patient's initial parameters.