Airway Clearance Using Non-Invasive Oscillating Device

Inclusion Criteria: * All the patients admitted to the PICU during the study period will be screened. The investigators will not set any restriction regarding the timing of prescription of CPT (i.e., length of PICU stay before screening) for the screening. The investigators will include only if CPT is expected to be used as a management at least for the next 24 hours in the PICU from the time of inclusion. For instance, if CPT will be expected to be discontinued from the management in a day, the investigators will exclude the participants from the inclusion. CPT can be prescribed for airway clearance with any etiology such as atelectasis at the directions of bedside pediatric intensivists in charge on the study date. The investigators will only include patients whose oxygenation is stable (SpO2\>90%) with less than 0.60 of ventilators. Exclusion Criteria: * CPT order will (or is expected to) be discontinued within 24 hours from the inclusion timing. * CPT is not ordered for airway clearance. * SpO2 is not stable (SpO2=\<90%) with more than 0.60 of FIO2 for the ventilated patients including patients on NIV, at least for previous 1 hour from the screening. * SpO2 is not stable (SpO2=\<90%) with more than 0.60 of FIO2 for the patients on HFNC, at least for previous 1 hour from the screening. * Bradycardia (HR\<80bpm) at any interventions at least for 24 hours prior to the screening. * Patients with known pneumothorax, osteomyelitis in the PICU admission. * Known pulmonary hyp…