| ARDS | acute respiratory distress syndrome |
| ETT | endotracheal tube |
| HPLC | high-performance liquid chromatography |
| iNO | inhaled nitric oxide |
| LC | liquid chromatography |
| MS | mass spectrometry |
| PC-CMV | pressure-controlled continuous mandatory ventilation |
| PEEP | positive end-expiratory pressure |
| PPH | primary pulmonary hypertension |
| VC-CMV | volume-controlled continuous mandatory ventilation |
| VMN | vibrating mesh nebulizer |
| VMNcont | continuous vibrating mesh nebulizer |
| VMNsyn | inspiration-synchronized vibrating mesh nebulizer |