title: I had a tissue aortic valve transplant two years ago, and today I feel great. The fatigue is gone and I exercise every day. But when I had an echocardiogram, I had an ejection fraction of 55 percent, which was better than my pre-transplant ejection fraction of 35 percent, though still at the low end of 'normal'. Why is the ejection fraction still fairly low, and can it ever improve?
mesh_terms: D001021:Aortic Valve / Q000637:transplantation; D001022:Aortic Valve Insufficiency / Q000150:complications / Q000601:surgery; D001794:Blood Pressure; D015444:Exercise; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000209:etiology / Q000503:physiopathology*; D008017:Life Expectancy; D012016:Reference Values; D013318:Stroke Volume / Q000502:physiology*