Fig. 1

Algorithm to identify patients with pulmonary hypertension secondary to COPD. CTEPH, chronic thromboembolic pulmonary hypertension; COPD, chronic obstructive pulmonary disease; HF, heart failure; IIP, idiopathic interstitial pneumonia; ILD, interstitial lung disease; LHD, left heart disease; PAH, pulmonary arterial hypertension; PF, pulmonary fibrosis; PH, pulmonary hypertension