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. 2021 Sep 4;1:4. doi: 10.1186/s44158-021-00001-y

Fig. 1.

Fig. 1

Possible approach for FOB in ICU in non-intubated patients. ARF, acute respiratory failure; FOB, flexible fiberoptic bronchoscopy; BAL, bronchoalveolar lavage; PaO2/FiO2 ratio between arterial partial pressure of oxygen and inspired oxygen fraction; CPAP, continuous positive airway pressure; NIV, non-invasive ventilation; HFNC, high-flow oxygen through nasal cannula; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2