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Kaplan–Meier curves of survival probability in patients with PH due to COPD with both TAPSE/PASP and 6MWD values in the lowest or intermediate tertile, stratified by use of targeted PH therapy. 6MWD, 6-min walk distance; PH, pulmonary hypertension; TAPSE/PASP, tricuspid annular plane systolic excursion/pulmonary artery systolic pressure.
