NPPB and Tricuspid regurgitation: This study found that after 3 months of specific treatment, regardless of whether or not combined with DAPA treatment, the 6MWD of patients was prolonged compared with before treatment, and the NT-proBNP, RAD, RVD, inferior vena cava diameter, peak velocity of tricuspid regurgitation and PG, sPAP, WHO-FC, and risk stratification were all decreased compared with before treatment, and TAPSE increased compared with before treatment, but there was no statistical difference between the two groups after treatment (P > 0.05).