Key parameters included left ventricular ejection fraction (LVEF), N-terminal pro-B-type natriuretic peptide (NT-proBNP) levels, lipid profile, hemoglobin A1C (HbA1c), fasting plasma glucose, six-minute walk test (6MWT) distance, and Kansas City Cardiomyopathy Questionnaire (KCCQ) scores. This evidence concerns the gene NPPB and cardiomyopathy.