Fig. 1From: Is oxygen therapy beneficial for normoxemic patients with acute heart failure? A propensity score matched studyCase inclusion flowchart. eICU electronic intensive care unit, AHF acute heart failure, PSM propensity score matching, ICD-9 international classification of diseases ninth revision, SpO2 pulse oximetry-derived oxygen saturation, COPD chronic obstructive pulmonary disease, NIV non-invasive ventilationBack to article page