HCQ: hydroxychloroquine, MI: myocardial infarction, CAD: coronary artery disease, BNP: B-type natriuretic peptide, AST: aspartate aminotransferase, ALT: alanine aminotransferase, LVEF: left ventricular ejection fraction, RHC: right heart catheterization, LGE: late gadolinium enhancement, LV: left ventricle, ECHO: echocardiogram. The gene discussed is NPPB; the disease is myocardial infarction.