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Patient selection flow chart. BNP: brain natriuretic peptide; NYHA FC: New York Heart Association functional class; CI: cardiac index; NT-proBNP: N-terminal pro-brain natriuretic peptide; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; PVOD: pulmonary veno-occlusive disease; RAP: right atrial pressure; 6 MWD: 6-min walk distance; TLC: total lung capacity.
