M arkers of myocardial necrosis, such as troponins I (cTnI) and T (cTnT), and indicators of HF, such as N‐terminal pro B‐type (NT‐proBNP) and the active form B‐type natriuretic peptide (BNP) are frequently utilized in clinical practice. The gene discussed is TNNI3; the disease is hydrops fetalis.