In the intervention group, it will be possible to change medical treatment and, if needed, prolong the hospitalization, in the case that the pre-discharge NT-proBNP levels are >3000 pg/mL. This value has been associated with a 13-fold increase in mortality and heart failure rehospitalisation rates in patients recently admitted for AHFS. (Eur J Heart Fail. 2007 Jun 15; [Epub ahead of print] PMID: 17573240) The following changes of treatment will be possible: increase in the dose of the diuretic, association of a different diuretic (e.g. an aldosterone antagonist); combination of digoxin therapy; increase in the dose of the rennin-angiotensin inhibitor; association of an angiotensin receptor blocker; association of a nitrate; short course of i.v. diuretic, vasodilator and/or inotropic therapy.