NPPA and hydrops fetalis: Many of these genes agree with previous HF gene expression literature, including decreased MYH6 (fold change = DCM, − 1.5; ICM, − 2.0) expression and increased NPPA (fold change = DCM, 18.1; ICM, 11.2) and NPPB (fold change = DCM, 15.0; ICM, 22.4) expression (Additional file 5: Table S4) [25, 26].