Inclusion Criteria:  Subjects presenting with shortness of breath and risk factors for and/or suspicion of having early-stage heart failure during initial clinical assessment. Informed Consent - The subject provides written informed consent using an Informed Consent Form that is reviewed and approved by the site's Institutional Review Board (IRB). Sinus rhythm - Conventional ECG results show a sinus rhythm and no other contraindicated rhythm abnormalities (see exclusions below) Age - Subject is ≥18 years of age  Exclusion Criteria:  Acute Disease - The subject has current acute coronary syndrome, decompensated heart failure, stroke, or previous history of MI. Prior Cardiac Procedures - The subject has received any prior cardiac interventions or surgical therapeutic procedures relating to cardiac abnormalities: valve replacement, pacemaker implantation, coronary artery bypass grafting (CABG), heart transplant, ablation, coronary stent placement, etc. Rhythm Abnormalities - Conventional ECG results indicating a lack of sinus rhythm and/or automatic heart failure pathway RULE IN rhythms including active atrial fibrillation or atrial flutter, left anterior fascicular block, left and/or right bundle branch block Pregnancy - The subject self declares pregnancy at the time of the study testing Chest deformities - The subject has chest deformities that interfere with accurate measurement of ECG (either conventional or wavECG) Measurement Interference - Subjects with central nervous system or musculoskeletal abnormalities that may interfere with accurate acquisition of ECG and/or echocardiogram measurements. Study Participation - The subject is enrolled in another clinical study that may interfere with MyoVista or echocardiogram measurements. Exceptions to this may be approved prior to enrollment.