Gas Exchange for Predicting Hospital Heart Failure Readmissions

Inclusion Criteria:

Subject is 18 Years and older

Subject is hospitalized for acute decompensated heart failure (ADHF)

Systolic OR
Diastolic
Subject is Stage C:Class II/III/IV heart failure
Subject is willing and to provide appropriate informed consent
Subject is willing and able to comply with the requirements of the protocol, including follow-up evaluations and schedule
Subject is willing to use the Shape-HF Cardiopulmonary Exercise Testing System

Exclusion Criteria:

The subject is pregnant (verified in a manner consistent with institution's standard of care)
Subject is currently participating in another investigational device or drug trial
Subject is a prisoner, a minor or unable to adequately give informed consent due to mental or physical condition
Subject is unwilling or unable to return for the required follow-up after test
Subject has Left Ventricular Assist Device (LVAD)
Subject is listed for transplant
Subject has a clinical diagnosis of acute myocardial infarction (AMI) on admission (Note: If troponin measurements have been collected and are elevated but not due to an MI subject is still eligible for study)
Subject has a pulmonary embolism (PE) on admission
Subject is dialysis dependent
Subject has a cardiac resynchronization device (CRT) which has been re-programmed at any time during the study
Subject has Chronic Obstructive Pulmonary Disease (COPD) who is oxygen or steroid dependent
Subject has severe hypertension > 180 millimeter of mercury (mmHg) resting systolic at time of test
Subject has severe heart failure with renal insufficiency (with Creatinine clearance rate (CrCL) of 30 or less) and/or on IV Inotropic therapy and/or enrolling in hospice