Noninvasive Ventilation in Moderate-to-severe COVID-19-associated Acute Respiratory Distress-syndrome

Measurement of the tidal volume, peak inspiratory flow, inspiratory time, respiratory rate and the pressure gap during triggering on NIV and plateau pressure on mechanical ventilation

Measurement of the diaphragm thickening fraction, assessment of the contraction of scalene and sternocleidomastoid muscles

Measurement of the lung impedance changes in 4 quadrants, measurement of regional ventilation delay in 4 quadrants

Measurement of end-tidal carbon dioxide tension

Measurement of the oxygen partial pressure and the carbon dioxide partial pressure

Quasistatic pressure-volume curve