title: Atrial fibrillation raised its head 15 months ago for the first time, and medication has stabilized me. An echocardiogram at the time of diagnosis showed an ejection fraction of 35 percent with some mitral valve leakage and left chamber enlargement. A new echo indicates an ejection fraction of 50 percent with minimal valve leakage, and only mild chamber enlargement. What could account for this improvement?
mesh_terms: D001281:Atrial Fibrillation / Q000150:complications / Q000503:physiopathology*; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000503:physiopathology; D008944:Mitral Valve Insufficiency / Q000503:physiopathology*; D012016:Reference Values; D013318:Stroke Volume / Q000502:physiology*