Inclusion Criteria:

• * Patients hospitalized for acute decompensated heart failure requiring treatment with intravenous diuretics and/or IV vasoactive drugs
• * Patient has signed informed consent and has authorized use and disclosed health information
• * Patient is at least 18 years of age
• * Patient physically suitable for ReDS measurement
• * GFR\>25
• * Initial ReDS Measurement \>35%

Exclusion Criteria:

• * Patient characteristics excluded from approved use of ReDS system: height less than 155cm or greater than 190cm, BMI \<22 or \>39, chest circumference \<80cm or \>115cm , or flail chest
• * Evidence of focal lung lesions on history, physical exam or chest x-ray, including history of pulmonary embolism, active pneumonia, or known lung nodule
• * Chronic renal failure (GFR\<25)
• * Prior cardiac surgery within 2 months of index admission
• * Patient has a ventricular assist device or has had a cardiac transplantation
• * Patients in cardiogenic shock at admission requiring inotropic support
• * Congenital heart malformations or intra-thoracic mass that would affect right-lung anatomy (e.g dextrocardia, lung carcinoma, or pacemaker box in the right chest)