Positive Expiratory Pressure (PEP) and Continuous High-frequency Oscillation (CHFO) on Lung RECRUITment Using Electrical Impedance Tomography (EIT) - The PEP-RECRUIT Study

Inclusion Criteria: * Patients who require pulmonary expansion and airway clearing as per clinical indication * Patients who provide valid informed consent according to local regulations * PaO2/FiO2 \< 200 mmHg at inclusion * Patient on the Airway Care Score (ACS) \< 7 Exclusion Criteria: * Refuse to participate * Age \< 18 years * Hemodynamic instability, defined as systolic arterial pressure \< 90 mmHg or mean pressure \< 60 mmHg * Contraindication to using an EIT (i.e., pacemaker or defibrillator) * Inability to properly position the EIT device for anatomical reasons