NPPB and hydrops fetalis: The exclusion criteria were (1) age <18 years (n = 2), (2) had previous pacemaker or ICD (n = 38), (3) did not fulfill at least one interrogation follow-up (n = 67), (4) failed to fulfill the current guideline indication for implantation (6, 7) (n = 25), (5) had missing NT-proBNP (n = 35), and (6) hospitalized for acute HF within a week (n = 22).