NPPB and hydrops fetalis: At regression analysis preoperative BNP was significantly and positively associated with MR progression (9.231 × 10−5 ± 4.181 × 10−5, p = 0.029), last follow-up moderate/severe MR (1.021 × 10−5 ± 4.122 × 10−5, p = 0.014) and mortality (9.964 × 10−5 ± 4.030 × 10−5, p = 0.015), but not rehospitalization for HF (−6.847 × 10−5 ± 3.221 × 10−5, p = 0.832).