Plasma levels of NT-proBNP will then be measured at discharge. It is our aim to use in the intervention group a treatment modality similar to that which may be expected if NT-proBNP levels are used to guide therapy. Therefore, the clinical investigator assessing these patients may require to the laboratory knowledge of the discharge NT-proBNP levels and delay patient's discharge and further adjust treatment, in case that the response to treatment (e.g. the decrease in NT-proBNP levels) be found as insufficient.