sPAP, systolic pulmonary artery pressure; PA, pulmonary artery; RV, right ventricle; RA, right atrium; CK-MB, creatine kinase myoglobin binding; RDW, red cell distribution width; BUN, blood urea nitrogen; BNP, brain natriuretic peptide; CTEPH, chronic thromboembolic pulmonary hypertension; TAPSE, tricuspid annular plane systolic excursion. Here, NPPB is linked to chronic thromboembolic pulmonary hypertension.