BioImpedentiometry, Lung UltraSound and cONgestion in Heart Failure

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.