title: Keep, preserve, replace.
authors.affiliation: Instituto do Coração, Hospital das Clínicas, FMUSP, São Paulo, SP, Brazil. grinberg@incor.usp.br
authors.forename: Max
authors.initials: M
authors.lastname: Grinberg
authors.forename: Pablo M A
authors.initials: PM
authors.lastname: Pommerantzeff
mesh_terms: D006349:Heart Valve Diseases / Q000601:surgery*; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D011379:Prognosis; D018570:Risk Assessment; D012720:Severity of Illness Index