The purpose of this study is to validate non-invasive and user-friendly methods to monitor systemic and pulmonary congestion in heart failure patients. The primary objective is to validate the role of bioimpedentiometry, pulmonary and subcutaneous ultrasound, to assess changes in total body water in patients with heart failure. vs the gold standard technique of deuterium oxide dilution Secondary objectives are \- to evaluate the applicability of bioimpedentiometry, pulmonary and subcutaneous ultrasound to monitor systemic, pulmonary and peripheral district congestion in relation with clinical and laboratory variables; 2)to analyze the organizational issues related to the use of these methods.
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Correlation between changes in total body water assessed by deuterium dilution (gold standard) and variations in body resistance by BioImpedentiometry
Timeframe: Group1 AHF Changes during hospital stay, with an expected average of 10 days; Group2 CHF Changes at 10±3 days from enrolment visit; Group3 ad-CHF Changes at 80±12h after levosimendan infusion from pre-infusion