This is an observational study to evaluate the agreement between the InCardia diagnostic technology CorWatch for the assessment of venous pressure in human subjects. This includes evaluation of InCardia technology in heart failure (HF) patients undergoing invasive right heart catheterization in a cardiac catheterization laboratory (cath lab) and in a cardiac intensive care unit (ICU).

Inclusion Criteria:

• Diagnosed with NYHA class II-IV heart failure irrespective of ejection fraction
• Patient is able to give consent

Exclusion Criteria:

• Severe tricuspid regurgitation
• Mechanical ventilation
• Patient is pregnant
• Inability to access either of the patient's upper arms.

Subjects with a diagnosis of NYHA class II-IV heart failure who meet the inclusion and exclusion criteria will be eligible for participation in this study.