Fig. 3
From: Efficacy and safety of nasal high-flow oxygen in COPD patients
Mean blood gas values during conventional oxygen therapy (COT) and nasal high-flow oxygen therapy (HFOT). Blood samples (n = 77) were subjected to measurements of PaCO2 (dotted line) and PaO2 (solid line) at baseline (1), after 10–60 min of oxygen adaptation until reaching a value of PaO2 > 60 mmHg or an increase of ≥10 mmHg (2), and at the end of the 60-min treatment period [including adaption] (3)