The aim of this study is to investigate whether the objective measurement of fluid overload by bioimpedance analysis (Body Composition Monitor-BCM) in patient with acute decompensated heart failure would improve the diuretic therapy.

Inclusion Criteria:

• Patients with known or newly discovered chronic heart failure admitted to hospital because of the clinical signs of acut cardiac decompensation

Exclusion Criteria:

• High level of fatigue (the patient cannot stand on a scale)
• Amputated upper and/or lower limb(s)
• The BCM analysis is not possible technically (e.g. open wounds on the limbs)
• Severe obesity (>130 kg)
• Patients on chronic hemodialysis or peritoneal dialysis
• Severe fluid volume in the transcellular space
• Patients with a unipolar pacemaker whose sensitivity threshold is very low
• Pregnancy, lactation