Based on clinical characteristics including ECG data, biomarkers (NT-proBNP), and signs and symptoms of HF, the authors identified 4 groups: a young group with high BMI, an elderly group with high rates of comorbidities, an ischemic cardiomyopathy group, and a non-ischemic cardiomyopathy group [10]. This evidence concerns the gene NPPB and hydrops fetalis.