Fig. 4From: Titration of oxygen therapy in critically ill emergency department patients: a feasibility studyOxygen saturation COPD GOLD III and IV patients (n = 25). On arrival at the ED (T = 0), after 10 min (T = 1), after 1 h (T = 2), after 3 h (T = 3) en after 24 h (T = 4)Back to article page