Inclusion Criteria:

   - Age ≥ 21 years

   - Able to consent in English and follow study instructions

   - Patients hospitalized or being seen in clinic with heart failure with a diagnosis of
   HFpEF, HFrEF or PH, as corresponding to each target patient group

   - Control patients may include patients that are hospitalized without heart failure, and
   cardiology patients without heart failure who are seen in outpatient cardiology, who
   may have suspected CAD and are scheduled for CCTA.

Exclusion Criteria:

   - Severe cardiac valvular heart disease

   - Previous prosthetic cardiac valve

   - Pericardial disease including constrictive pericarditis or moderate or large
   pericardial effusion

   - Mechanical circulatory support (including ECMO, LVADs etc).

   - Heart and/or lung transplant recipients

   - Major adverse cardiovascular event or surgery within 6 weeks of planned study
   enrollment

   - Patients with pacemaker that has over 1% of beats paced

   - Pectus excavatum (severe)

   - Pregnant women

   - On Dialysis

   - Exclude at the clinical discretion of the Principal Investigators

   - Not possible to acquire echocardiography with sufficient quality