Fluid Status of Outpatients With Dyspnea

INCLUSION CRITERIA * Shortness of breath as the most prominent presenting symptom * Age greater ≥ 45 * Willingness, ability, and commitment to participate in the study EXCLUSION CRITERIA * Patients with any active implantable medical device * Patients who are pregnant or lactating * Patients who have tattoos and or non-intact skin directly under the electrode position * Patients who have had past allergic reactions to medical grade adhesives * Patients that are dialysis dependent * Patients who have had a lung lobectomy * Patients in whom the shortness of breath presentation is due to obvious non HF cause such as acute chest trauma * Patients who have received nitrates (sub-lingual, topical or IV), diuretics or vasopressors ≥ 1 hour prior to IMED-4 Recording * Patients who decline to have their backs photographed with the IMED-4 device in position * Patients who are receiving invasive or non-invasive positive airway pressure (PAP) ventilation prior to or following presentation to the ED (Self presentation or admission via EMS). * Severe co-morbidity or poor general physical/mental health that, in the opinion of the Investigator, will not allow the subject to be a good study candidate (i.e. other disease processes, mental capacity, substance abuse, incarceration, shortened life expectancy, etc.)