Monitorings the Physiological Mechanism of Airway Pressure Release Ventilation in ARDS Patients by EIT

Monitorings the Physiological Mechanism of Airway Pressure Release Ventilation(APRV) in Acute Respiratory Distress Syndrome (ARDS) Patients by Electrical Impedance Tomography(EIT)

Effects of airway pressure release ventilation on pulmonary ventilation, shunt and perfusion in patients with ARDS

Effects of airway pressure release ventilation on respiratory mechanisms including ventilation distribution, intrapulmonary shunt and V/Q match in lungs of ARDS evaluated by EIT at different time points.

Inclusion Criteria:

1. 18 years old < age < 80 years old
2. Diagnosed as moderate or severe ARDS according to the Berlin 2014 definition
3. Predicted APRV mechanical ventilation for more than 72 hours

Exclusion Criteria:

Excluded if any of the following exclusion criteria are met:

1. APRV contraindications such as pneumothorax, severe chronic obstructive pulmonary disease, severe asthma, intracranial hypertension
2. Pregnant women
3. Severe cardiac dysfunction (New York Heart Association class III or IV, acute coronary syndrome or sustained ventricular tachyarrhythmia), right heart enlargement due to chronic cardiopulmonary disease, cardiogenic shock or cardiac hand
4. Refractory shock
5. BMI>35