The present invention relates to the NEP inhibitor pro-drug N-(3-carboxy-1-oxopropyl)-(4S)-p-phenylphenylmethyl)-4-amino-(2R)-methylbutanoic acid ethyl ester, or a pharmaceutically acceptable salt thereof; or the NEP inhibitor N-(3-carboxy-1-oxopropyl)-(4S)-p-phenylphenylmethyl)-4-amino-(2R)-methylbutanoic acid, or a pharmaceutically acceptable salt thereof, pro-drug for use in the treatment, prevention or delay of progression of a disease characterized by atrial enlargement and/or remodeling; a method for treatment, prevention or delay of progression of a disease characterized by atrial enlargement and/or remodeling comprising administration of a therapeutically effective amount, or a prophylactically effective amount, of the NEP inhibitor or the NEP inhibitor pro-drug, or a pharmaceutically acceptable salt pro-drug thereof, to a subject, e.g. a human subject, in need of such treatment. The present invention further relates to a pharmaceutical composition or a commercial package comprising the NEP inhibitor or the NEP inhibitor pro-drug, or a pharmaceutically acceptable salt thereof, pro-drug for use in the treatment, prevention or delay of progression of a disease characterized by atrial enlargement and/or remodeling.La présente invention concerne le promédicament inhibiteur de NEP ester éthylique de l'acide N-(3-carboxy-1-oxopropyl)-(4S)-p-phénylphénylméthyl)-4-amino-(2R)-méthylbutanoïque ou un sel pharmaceutiquement acceptable de celui-ci; ou l'inhibiteur de NEP acide N-(3-carboxy-1-oxopropyl)-(4S)-p-phénylphénylmethyl)-4-amino-(2R)-méthylbutanoïque ou un sel pharmaceutiquement acceptable de celui-ci, un promédicament pour l'utilisation dans le traitement, la prévention ou le retard de la progression d'une maladie caractérisée par un agrandissement atrial et/ou une remodélisation atriale; une méthode de traitement, de prévention ou de retard de la progression d'une maladie caractérisée par un agrandissement atrial et/ou une remodélisation atriale, comprenant l'a