This observational study yielded the following results: (1) there were significant differences in HFEI between HFrEF, HFmrEF and HFpEF patients; (2) multivariate regression analysis indicated that HFEI and NT-proBNP were independent risk factors for the prognosis of one-year adverse events in HF patients; and (3) HFEI and NT-proBNP had a good value in predicting the short-term prognosis of HF patients. Here, NPPB is linked to hydrops fetalis.