I have had a diagnosis of heart failure for many years, but I recently had an echocardiogram, and the doctor told me it showed my heart was not weakened at all. What is causing my shortness of breath?
D004417:Dyspnea / Q000209:etiology*; D004452:Echocardiography; D006333:Heart Failure / Q000000981:diagnostic imaging*; D006801:Humans