NPPB and congestive heart failure: BNP, B-type natriuretic peptide; CHF, chronic heart failure; eGFR, estimated glomerular filtration rate; ICD/CRTD, implantable cardioverter defibrillator/cardiac resynchronization therapy with defibrillator; LVEF, left ventricular ejection fraction; MEGP, medium-energy general purpose; mIBG, meta-iodobenzylguanidine; NT-proBNP, N-terminal pro b-type natriuretic peptide; NYHA, New York Heart Association